{"dataType": "CVE_RECORD", "dataVersion": "5.1", "cveMetadata": {"cveId": "CVE-2024-26616", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-02-19T14:20:24.131Z", "datePublished": "2024-02-29T15:52:19.452Z", "dateUpdated": "2025-05-04T08:52:23.003Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2025-05-04T08:52:23.003Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: scrub: avoid use-after-free when chunk length is not 64K aligned\n\n[BUG]\nThere is a bug report that, on a ext4-converted btrfs, scrub leads to\nvarious problems, including:\n\n- \"unable to find chunk map\" errors\n BTRFS info (device vdb): scrub: started on devid 1\n BTRFS critical (device vdb): unable to find chunk map for logical 2214744064 length 4096\n BTRFS critical (device vdb): unable to find chunk map for logical 2214744064 length 45056\n\n This would lead to unrepariable errors.\n\n- Use-after-free KASAN reports:\n ==================================================================\n BUG: KASAN: slab-use-after-free in __blk_rq_map_sg+0x18f/0x7c0\n Read of size 8 at addr ffff8881013c9040 by task btrfs/909\n CPU: 0 PID: 909 Comm: btrfs Not tainted 6.7.0-x64v3-dbg #11 c50636e9419a8354555555245df535e380563b2b\n Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 2023.11-2 12/24/2023\n Call Trace:\n <TASK>\n dump_stack_lvl+0x43/0x60\n print_report+0xcf/0x640\n kasan_report+0xa6/0xd0\n __blk_rq_map_sg+0x18f/0x7c0\n virtblk_prep_rq.isra.0+0x215/0x6a0 [virtio_blk 19a65eeee9ae6fcf02edfad39bb9ddee07dcdaff]\n virtio_queue_rqs+0xc4/0x310 [virtio_blk 19a65eeee9ae6fcf02edfad39bb9ddee07dcdaff]\n blk_mq_flush_plug_list.part.0+0x780/0x860\n __blk_flush_plug+0x1ba/0x220\n blk_finish_plug+0x3b/0x60\n submit_initial_group_read+0x10a/0x290 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965]\n flush_scrub_stripes+0x38e/0x430 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965]\n scrub_stripe+0x82a/0xae0 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965]\n scrub_chunk+0x178/0x200 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965]\n scrub_enumerate_chunks+0x4bc/0xa30 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965]\n btrfs_scrub_dev+0x398/0x810 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965]\n btrfs_ioctl+0x4b9/0x3020 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965]\n __x64_sys_ioctl+0xbd/0x100\n do_syscall_64+0x5d/0xe0\n entry_SYSCALL_64_after_hwframe+0x63/0x6b\n RIP: 0033:0x7f47e5e0952b\n\n- Crash, mostly due to above use-after-free\n\n[CAUSE]\nThe converted fs has the following data chunk layout:\n\n item 2 key (FIRST_CHUNK_TREE CHUNK_ITEM 2214658048) itemoff 16025 itemsize 80\n length 86016 owner 2 stripe_len 65536 type DATA|single\n\nFor above logical bytenr 2214744064, it's at the chunk end\n(2214658048 + 86016 = 2214744064).\n\nThis means btrfs_submit_bio() would split the bio, and trigger endio\nfunction for both of the two halves.\n\nHowever scrub_submit_initial_read() would only expect the endio function\nto be called once, not any more.\nThis means the first endio function would already free the bbio::bio,\nleaving the bvec freed, thus the 2nd endio call would lead to\nuse-after-free.\n\n[FIX]\n- Make sure scrub_read_endio() only updates bits in its range\n Since we may read less than 64K at the end of the chunk, we should not\n touch the bits beyond chunk boundary.\n\n- Make sure scrub_submit_initial_read() only to read the chunk range\n This is done by calculating the real number of sectors we need to\n read, and add sector-by-sector to the bio.\n\nThankfully the scrub read repair path won't need extra fixes:\n\n- scrub_stripe_submit_repair_read()\n With above fixes, we won't update error bit for range beyond chunk,\n thus scrub_stripe_submit_repair_read() should never submit any read\n beyond the chunk."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/btrfs/scrub.c"], "versions": [{"version": "e02ee89baa66c40e1002cf8b09141fce7265e0f5", "lessThan": "642b9c520ef2f104277ad1f902f8526edbe087fb", "status": "affected", "versionType": "git"}, {"version": "e02ee89baa66c40e1002cf8b09141fce7265e0f5", "lessThan": "34de0f04684ec00c093a0455648be055f0e8e24f", "status": "affected", "versionType": "git"}, {"version": "e02ee89baa66c40e1002cf8b09141fce7265e0f5", "lessThan": "f546c4282673497a06ecb6190b50ae7f6c85b02f", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/btrfs/scrub.c"], "versions": [{"version": "6.4", "status": "affected"}, {"version": "0", "lessThan": "6.4", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.15", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.7.3", "lessThanOrEqual": "6.7.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.8", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.4", "versionEndExcluding": "6.6.15"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.4", "versionEndExcluding": "6.7.3"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.4", "versionEndExcluding": "6.8"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/642b9c520ef2f104277ad1f902f8526edbe087fb"}, {"url": "https://git.kernel.org/stable/c/34de0f04684ec00c093a0455648be055f0e8e24f"}, {"url": "https://git.kernel.org/stable/c/f546c4282673497a06ecb6190b50ae7f6c85b02f"}], "title": "btrfs: scrub: avoid use-after-free when chunk length is not 64K aligned", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-02T00:07:19.788Z"}, "title": "CVE Program Container", "references": [{"url": "https://git.kernel.org/stable/c/642b9c520ef2f104277ad1f902f8526edbe087fb", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/34de0f04684ec00c093a0455648be055f0e8e24f", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/f546c4282673497a06ecb6190b50ae7f6c85b02f", "tags": ["x_transferred"]}]}, {"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2024-26616", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2024-09-10T15:57:14.247460Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-09-11T17:33:49.394Z"}}]}}

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"2024-09-11T12:42:18.955Z"}}], "cna": {"title": "btrfs: scrub: avoid use-after-free when chunk length is not 64K aligned", "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "e02ee89baa66c40e1002cf8b09141fce7265e0f5", "lessThan": "642b9c520ef2f104277ad1f902f8526edbe087fb", "versionType": "git"}, {"status": "affected", "version": "e02ee89baa66c40e1002cf8b09141fce7265e0f5", "lessThan": "34de0f04684ec00c093a0455648be055f0e8e24f", "versionType": "git"}, {"status": "affected", "version": "e02ee89baa66c40e1002cf8b09141fce7265e0f5", "lessThan": "f546c4282673497a06ecb6190b50ae7f6c85b02f", "versionType": "git"}], "programFiles": ["fs/btrfs/scrub.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "6.4"}, {"status": "unaffected", "version": "0", "lessThan": "6.4", "versionType": "semver"}, {"status": "unaffected", "version": "6.6.15", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.7.3", "versionType": "semver", "lessThanOrEqual": "6.7.*"}, {"status": "unaffected", "version": "6.8", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["fs/btrfs/scrub.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/642b9c520ef2f104277ad1f902f8526edbe087fb"}, {"url": "https://git.kernel.org/stable/c/34de0f04684ec00c093a0455648be055f0e8e24f"}, {"url": "https://git.kernel.org/stable/c/f546c4282673497a06ecb6190b50ae7f6c85b02f"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: scrub: avoid use-after-free when chunk length is not 64K aligned\n\n[BUG]\nThere is a bug report that, on a ext4-converted btrfs, scrub leads to\nvarious problems, including:\n\n- \"unable to find chunk map\" errors\n BTRFS info (device vdb): scrub: started on devid 1\n BTRFS critical (device vdb): unable to find chunk map for logical 2214744064 length 4096\n BTRFS critical (device vdb): unable to find chunk map for logical 2214744064 length 45056\n\n This would lead to unrepariable errors.\n\n- Use-after-free KASAN reports:\n ==================================================================\n BUG: KASAN: slab-use-after-free in __blk_rq_map_sg+0x18f/0x7c0\n Read of size 8 at addr ffff8881013c9040 by task btrfs/909\n CPU: 0 PID: 909 Comm: btrfs Not tainted 6.7.0-x64v3-dbg #11 c50636e9419a8354555555245df535e380563b2b\n Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 2023.11-2 12/24/2023\n Call Trace:\n <TASK>\n dump_stack_lvl+0x43/0x60\n print_report+0xcf/0x640\n kasan_report+0xa6/0xd0\n __blk_rq_map_sg+0x18f/0x7c0\n virtblk_prep_rq.isra.0+0x215/0x6a0 [virtio_blk 19a65eeee9ae6fcf02edfad39bb9ddee07dcdaff]\n virtio_queue_rqs+0xc4/0x310 [virtio_blk 19a65eeee9ae6fcf02edfad39bb9ddee07dcdaff]\n blk_mq_flush_plug_list.part.0+0x780/0x860\n __blk_flush_plug+0x1ba/0x220\n blk_finish_plug+0x3b/0x60\n submit_initial_group_read+0x10a/0x290 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965]\n flush_scrub_stripes+0x38e/0x430 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965]\n scrub_stripe+0x82a/0xae0 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965]\n scrub_chunk+0x178/0x200 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965]\n scrub_enumerate_chunks+0x4bc/0xa30 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965]\n btrfs_scrub_dev+0x398/0x810 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965]\n btrfs_ioctl+0x4b9/0x3020 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965]\n __x64_sys_ioctl+0xbd/0x100\n do_syscall_64+0x5d/0xe0\n entry_SYSCALL_64_after_hwframe+0x63/0x6b\n RIP: 0033:0x7f47e5e0952b\n\n- Crash, mostly due to above use-after-free\n\n[CAUSE]\nThe converted fs has the following data chunk layout:\n\n item 2 key (FIRST_CHUNK_TREE CHUNK_ITEM 2214658048) itemoff 16025 itemsize 80\n length 86016 owner 2 stripe_len 65536 type DATA|single\n\nFor above logical bytenr 2214744064, it's at the chunk end\n(2214658048 + 86016 = 2214744064).\n\nThis means btrfs_submit_bio() would split the bio, and trigger endio\nfunction for both of the two halves.\n\nHowever scrub_submit_initial_read() would only expect the endio function\nto be called once, not any more.\nThis means the first endio function would already free the bbio::bio,\nleaving the bvec freed, thus the 2nd endio call would lead to\nuse-after-free.\n\n[FIX]\n- Make sure scrub_read_endio() only updates bits in its range\n Since we may read less than 64K at the end of the chunk, we should not\n touch the bits beyond chunk boundary.\n\n- Make sure scrub_submit_initial_read() only to read the chunk range\n This is done by calculating the real number of sectors we need to\n read, and add sector-by-sector to the bio.\n\nThankfully the scrub read repair path won't need extra fixes:\n\n- scrub_stripe_submit_repair_read()\n With above fixes, we won't update error bit for range beyond chunk,\n thus scrub_stripe_submit_repair_read() should never submit any read\n beyond the chunk."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.15", "versionStartIncluding": "6.4"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.7.3", "versionStartIncluding": "6.4"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.8", "versionStartIncluding": "6.4"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2025-05-04T08:52:23.003Z"}}}, "cveMetadata": {"cveId": "CVE-2024-26616", "state": "PUBLISHED", "dateUpdated": "2025-05-04T08:52:23.003Z", "dateReserved": "2024-02-19T14:20:24.131Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2024-02-29T15:52:19.452Z", "assignerShortName": "Linux"}, "dataVersion": "5.1"}

{"configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "D6633E78-36B1-447E-BE57-C820A3E58E33", "versionEndExcluding": "6.6.15", "versionStartIncluding": "6.4", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "58FD5308-148A-40D3-B36A-0CA6B434A8BF", "versionEndExcluding": "6.7.3", "versionStartIncluding": "6.7", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.8:rc1:*:*:*:*:*:*", "matchCriteriaId": "B9F4EA73-0894-400F-A490-3A397AB7A517", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: scrub: avoid use-after-free when chunk length is not 64K aligned\n\n[BUG]\nThere is a bug report that, on a ext4-converted btrfs, scrub leads to\nvarious problems, including:\n\n- \"unable to find chunk map\" errors\n BTRFS info (device vdb): scrub: started on devid 1\n BTRFS critical (device vdb): unable to find chunk map for logical 2214744064 length 4096\n BTRFS critical (device vdb): unable to find chunk map for logical 2214744064 length 45056\n\n This would lead to unrepariable errors.\n\n- Use-after-free KASAN reports:\n ==================================================================\n BUG: KASAN: slab-use-after-free in __blk_rq_map_sg+0x18f/0x7c0\n Read of size 8 at addr ffff8881013c9040 by task btrfs/909\n CPU: 0 PID: 909 Comm: btrfs Not tainted 6.7.0-x64v3-dbg #11 c50636e9419a8354555555245df535e380563b2b\n Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 2023.11-2 12/24/2023\n Call Trace:\n <TASK>\n dump_stack_lvl+0x43/0x60\n print_report+0xcf/0x640\n kasan_report+0xa6/0xd0\n __blk_rq_map_sg+0x18f/0x7c0\n virtblk_prep_rq.isra.0+0x215/0x6a0 [virtio_blk 19a65eeee9ae6fcf02edfad39bb9ddee07dcdaff]\n virtio_queue_rqs+0xc4/0x310 [virtio_blk 19a65eeee9ae6fcf02edfad39bb9ddee07dcdaff]\n blk_mq_flush_plug_list.part.0+0x780/0x860\n __blk_flush_plug+0x1ba/0x220\n blk_finish_plug+0x3b/0x60\n submit_initial_group_read+0x10a/0x290 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965]\n flush_scrub_stripes+0x38e/0x430 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965]\n scrub_stripe+0x82a/0xae0 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965]\n scrub_chunk+0x178/0x200 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965]\n scrub_enumerate_chunks+0x4bc/0xa30 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965]\n btrfs_scrub_dev+0x398/0x810 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965]\n btrfs_ioctl+0x4b9/0x3020 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965]\n __x64_sys_ioctl+0xbd/0x100\n do_syscall_64+0x5d/0xe0\n entry_SYSCALL_64_after_hwframe+0x63/0x6b\n RIP: 0033:0x7f47e5e0952b\n\n- Crash, mostly due to above use-after-free\n\n[CAUSE]\nThe converted fs has the following data chunk layout:\n\n item 2 key (FIRST_CHUNK_TREE CHUNK_ITEM 2214658048) itemoff 16025 itemsize 80\n length 86016 owner 2 stripe_len 65536 type DATA|single\n\nFor above logical bytenr 2214744064, it's at the chunk end\n(2214658048 + 86016 = 2214744064).\n\nThis means btrfs_submit_bio() would split the bio, and trigger endio\nfunction for both of the two halves.\n\nHowever scrub_submit_initial_read() would only expect the endio function\nto be called once, not any more.\nThis means the first endio function would already free the bbio::bio,\nleaving the bvec freed, thus the 2nd endio call would lead to\nuse-after-free.\n\n[FIX]\n- Make sure scrub_read_endio() only updates bits in its range\n Since we may read less than 64K at the end of the chunk, we should not\n touch the bits beyond chunk boundary.\n\n- Make sure scrub_submit_initial_read() only to read the chunk range\n This is done by calculating the real number of sectors we need to\n read, and add sector-by-sector to the bio.\n\nThankfully the scrub read repair path won't need extra fixes:\n\n- scrub_stripe_submit_repair_read()\n With above fixes, we won't update error bit for range beyond chunk,\n thus scrub_stripe_submit_repair_read() should never submit any read\n beyond the chunk."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: btrfs: limpieza: evita el use-after-free cuando la longitud del fragmento no est\u00e1 alineada con 64 K [ERROR] Hay un informe de error que indica que, en un btrfs convertido a ext4, la limpieza conduce a varios problemas, que incluyen: - Errores \"no se puede encontrar el mapa de fragmentos\" Informaci\u00f3n BTRFS (dispositivo vdb): limpieza: iniciado en el devid 1 BTRFS cr\u00edtico (dispositivo vdb): no se puede encontrar el mapa de fragmentos para la longitud l\u00f3gica 2214744064 4096 BTRFS cr\u00edtico (dispositivo vdb): No se puede encontrar el mapa de fragmentos para la longitud l\u00f3gica 2214744064 45056. Esto provocar\u00eda errores irreparables. - Informes KASAN de uso gratuito: =========================================== ========================= ERROR: KASAN: slab-use-after-free en __blk_rq_map_sg+0x18f/0x7c0 Lectura de tama\u00f1o 8 en la direcci\u00f3n ffff8881013c9040 por tarea btrfs/909 CPU: 0 PID: 909 Comm: btrfs Not tainted 6.7.0-x64v3-dbg #11 c50636e9419a8354555555245df535e380563b2b Nombre de hardware: PC est\u00e1ndar QEMU (Q35 + ICH9, 2009), BIOS 2023.11-2 24/12/2023 Seguimiento de llamadas : dump_stack_lvl+0x43/0x60 print_report+0xcf/0x640 kasan_report+0xa6/0xd0 __blk_rq_map_sg+0x18f/0x7c0 virtblk_prep_rq.isra.0+0x215/0x6a0 [virtio_blk 19a65eeee9ae6fcf02ed fad39bb9ddee07dcdaff] virtio_queue_rqs+0xc4/0x310 [virtio_blk 19a65eeee9ae6fcf02edfad39bb9ddee07dcdaff] blk_mq_flush_plug_list.part. 0+0x780/0x860 __blk_flush_plug+0x1ba/0x220 blk_finish_plug+0x3b/0x60 submit_initial_group_read+0x10a/0x290 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965] Flush_scrub_stripes+0x38 e/0x430 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965] Scrub_stripe+0x82a/0xae0 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965] Scrub_chunk+0x178/0x200 [btrfs e579 87a360cama82fe8756dcd3e0de5406ccfe965 ] Scrub_enumerate_chunks+0x4bc/0xa30 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965] btrfs_scrub_dev+0x398/0x810 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965] btr fs_ioctl+0x4b9/0x3020 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965] __x64_sys_ioctl+0xbd/0x100 do_syscall_64+0x5d/0xe0 Entry_SYSCALL_64_after_hwframe+0x63/0x6b QEPD: 0033:0x7f47e5e0952b - Fallo , principalmente debido al use-after-free anterior [CAUSA] El fs convertido tiene el siguiente dise\u00f1o de fragmento de datos: clave del elemento 2 (FIRST_CHUNK_TREE CHUNK_ITEM 2214658048) itemoff 16025 tama\u00f1o del elemento 80 longitud 86016 propietario 2 stripe_len 65536 tipo DATOS|single Para el bytenr l\u00f3gico anterior 2214744064 , est\u00e1 al final del fragmento (2214658048 + 86016 = 2214744064). Esto significa que btrfs_submit_bio() dividir\u00eda la biograf\u00eda y activar\u00eda la funci\u00f3n endio para ambas mitades. Sin embargo, Scrub_submit_initial_read() solo esperar\u00eda que la funci\u00f3n endio se llamara una vez, ya no. Esto significa que la primera funci\u00f3n endio ya liberar\u00eda bbio::bio, dejando libre el bvec, por lo que la segunda llamada a endio conducir\u00eda a use-after-free. [FIX] - Aseg\u00farese de que Scrub_read_endio() solo actualice los bits en su rango. Dado que podemos leer menos de 64 K al final del fragmento, no debemos tocar los bits m\u00e1s all\u00e1 del l\u00edmite del fragmento. - Aseg\u00farese de que Scrub_submit_initial_read() solo lea el rango de fragmentos. Esto se hace calculando el n\u00famero real de sectores que necesitamos leer y agregando sector por sector a la biograf\u00eda. Afortunadamente, la ruta de reparaci\u00f3n de lectura de limpieza no necesitar\u00e1 correcciones adicionales: - Scrub_stripe_submit_repair_read() Con las correcciones anteriores, no actualizaremos el bit de error para el rango m\u00e1s all\u00e1 del fragmento, por lo tanto, Scrub_stripe_submit_repair_read() nunca deber\u00eda enviar ninguna lectura m\u00e1s all\u00e1 del fragmento."}], "id": "CVE-2024-26616", "lastModified": "2024-12-12T15:31:18.293", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "[email protected]", "type": "Primary"}]}, "published": "2024-03-11T18:15:19.400", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/34de0f04684ec00c093a0455648be055f0e8e24f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/642b9c520ef2f104277ad1f902f8526edbe087fb"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f546c4282673497a06ecb6190b50ae7f6c85b02f"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/34de0f04684ec00c093a0455648be055f0e8e24f"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/642b9c520ef2f104277ad1f902f8526edbe087fb"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f546c4282673497a06ecb6190b50ae7f6c85b02f"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "[email protected]", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: btrfs: scrub: avoid use-after-free when chunk length is not 64K aligned", "id": "2267352", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2267352"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.8", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-416", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nbtrfs: scrub: avoid use-after-free when chunk length is not 64K aligned\n[BUG]\nThere is a bug report that, on a ext4-converted btrfs, scrub leads to\nvarious problems, including:\n- \"unable to find chunk map\" errors\nBTRFS info (device vdb): scrub: started on devid 1\nBTRFS critical (device vdb): unable to find chunk map for logical 2214744064 length 4096\nBTRFS critical (device vdb): unable to find chunk map for logical 2214744064 length 45056\nThis would lead to unrepariable errors.\n- Use-after-free KASAN reports:\n==================================================================\nBUG: KASAN: slab-use-after-free in __blk_rq_map_sg+0x18f/0x7c0\nRead of size 8 at addr ffff8881013c9040 by task btrfs/909\nCPU: 0 PID: 909 Comm: btrfs Not tainted 6.7.0-x64v3-dbg #11 c50636e9419a8354555555245df535e380563b2b\nHardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 2023.11-2 12/24/2023\nCall Trace:\n<TASK>\ndump_stack_lvl+0x43/0x60\nprint_report+0xcf/0x640\nkasan_report+0xa6/0xd0\n__blk_rq_map_sg+0x18f/0x7c0\nvirtblk_prep_rq.isra.0+0x215/0x6a0 [virtio_blk 19a65eeee9ae6fcf02edfad39bb9ddee07dcdaff]\nvirtio_queue_rqs+0xc4/0x310 [virtio_blk 19a65eeee9ae6fcf02edfad39bb9ddee07dcdaff]\nblk_mq_flush_plug_list.part.0+0x780/0x860\n__blk_flush_plug+0x1ba/0x220\nblk_finish_plug+0x3b/0x60\nsubmit_initial_group_read+0x10a/0x290 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965]\nflush_scrub_stripes+0x38e/0x430 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965]\nscrub_stripe+0x82a/0xae0 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965]\nscrub_chunk+0x178/0x200 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965]\nscrub_enumerate_chunks+0x4bc/0xa30 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965]\nbtrfs_scrub_dev+0x398/0x810 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965]\nbtrfs_ioctl+0x4b9/0x3020 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965]\n__x64_sys_ioctl+0xbd/0x100\ndo_syscall_64+0x5d/0xe0\nentry_SYSCALL_64_after_hwframe+0x63/0x6b\nRIP: 0033:0x7f47e5e0952b\n- Crash, mostly due to above use-after-free\n[CAUSE]\nThe converted fs has the following data chunk layout:\nitem 2 key (FIRST_CHUNK_TREE CHUNK_ITEM 2214658048) itemoff 16025 itemsize 80\nlength 86016 owner 2 stripe_len 65536 type DATA|single\nFor above logical bytenr 2214744064, it's at the chunk end\n(2214658048 + 86016 = 2214744064).\nThis means btrfs_submit_bio() would split the bio, and trigger endio\nfunction for both of the two halves.\nHowever scrub_submit_initial_read() would only expect the endio function\nto be called once, not any more.\nThis means the first endio function would already free the bbio::bio,\nleaving the bvec freed, thus the 2nd endio call would lead to\nuse-after-free.\n[FIX]\n- Make sure scrub_read_endio() only updates bits in its range\nSince we may read less than 64K at the end of the chunk, we should not\ntouch the bits beyond chunk boundary.\n- Make sure scrub_submit_initial_read() only to read the chunk range\nThis is done by calculating the real number of sectors we need to\nread, and add sector-by-sector to the bio.\nThankfully the scrub read repair path won't need extra fixes:\n- scrub_stripe_submit_repair_read()\nWith above fixes, we won't update error bit for range beyond chunk,\nthus scrub_stripe_submit_repair_read() should never submit any read\nbeyond the chunk.", "A use-after-free flaw was found in the Linux Kernel when the chunk length is not 64K aligned."], "name": "CVE-2024-26616", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-02-29T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-26616\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-26616\nhttps://lore.kernel.org/linux-cve-announce/[email protected]/T/#u"], "statement": "Red Hat Enterprise Linux 8 and 9 are not affected by this CVE as they do not include Btrfs filesystem support (CONFIG_BTRFS_FS is not set).", "threat_severity": "Moderate"}