{"dataType": "CVE_RECORD", "dataVersion": "5.1", "cveMetadata": {"cveId": "CVE-2025-38627", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-04-16T04:51:24.029Z", "datePublished": "2025-08-22T16:00:35.856Z", "dateUpdated": "2025-09-29T05:55:05.007Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2025-09-29T05:55:05.007Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: compress: fix UAF of f2fs_inode_info in f2fs_free_dic\n\nThe decompress_io_ctx may be released asynchronously after\nI/O completion. If this file is deleted immediately after read,\nand the kworker of processing post_read_wq has not been executed yet\ndue to high workloads, It is possible that the inode(f2fs_inode_info)\nis evicted and freed before it is used f2fs_free_dic.\n\n The UAF case as below:\n Thread A Thread B\n - f2fs_decompress_end_io\n - f2fs_put_dic\n - queue_work\n add free_dic work to post_read_wq\n - do_unlink\n - iput\n - evict\n - call_rcu\n This file is deleted after read.\n\n Thread C kworker to process post_read_wq\n - rcu_do_batch\n - f2fs_free_inode\n - kmem_cache_free\n inode is freed by rcu\n - process_scheduled_works\n - f2fs_late_free_dic\n - f2fs_free_dic\n - f2fs_release_decomp_mem\n read (dic->inode)->i_compress_algorithm\n\nThis patch store compress_algorithm and sbi in dic to avoid inode UAF.\n\nIn addition, the previous solution is deprecated in [1] may cause system hang.\n[1] https://lore.kernel.org/all/[email protected]"}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/f2fs/compress.c", "fs/f2fs/f2fs.h"], "versions": [{"version": "bff139b49d9f70c1ac5384aac94554846aa834de", "lessThan": "8fae5b6addd5f6895e03797b56e3c7b9f9cd15c9", "status": "affected", "versionType": "git"}, {"version": "bff139b49d9f70c1ac5384aac94554846aa834de", "lessThan": "39868685c2a94a70762bc6d77dc81d781d05bff5", "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/f2fs/compress.c", "fs/f2fs/f2fs.h"], "versions": [{"version": "6.0", "status": "affected"}, {"version": "0", "lessThan": "6.0", "status": "unaffected", "versionType": "semver"}, {"version": "6.16.1", "lessThanOrEqual": "6.16.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.17", "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": "6.0", "versionEndExcluding": "6.16.1"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.0", "versionEndExcluding": "6.17"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/8fae5b6addd5f6895e03797b56e3c7b9f9cd15c9"}, {"url": "https://git.kernel.org/stable/c/39868685c2a94a70762bc6d77dc81d781d05bff5"}], "title": "f2fs: compress: fix UAF of f2fs_inode_info in f2fs_free_dic", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "3AF1532A-8F0C-4D73-8D9F-3580F2A8F834", "versionEndExcluding": "6.16.1", "versionStartIncluding": "6.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: compress: fix UAF of f2fs_inode_info in f2fs_free_dic\n\nThe decompress_io_ctx may be released asynchronously after\nI/O completion. If this file is deleted immediately after read,\nand the kworker of processing post_read_wq has not been executed yet\ndue to high workloads, It is possible that the inode(f2fs_inode_info)\nis evicted and freed before it is used f2fs_free_dic.\n\n The UAF case as below:\n Thread A Thread B\n - f2fs_decompress_end_io\n - f2fs_put_dic\n - queue_work\n add free_dic work to post_read_wq\n - do_unlink\n - iput\n - evict\n - call_rcu\n This file is deleted after read.\n\n Thread C kworker to process post_read_wq\n - rcu_do_batch\n - f2fs_free_inode\n - kmem_cache_free\n inode is freed by rcu\n - process_scheduled_works\n - f2fs_late_free_dic\n - f2fs_free_dic\n - f2fs_release_decomp_mem\n read (dic->inode)->i_compress_algorithm\n\nThis patch store compress_algorithm and sbi in dic to avoid inode UAF.\n\nIn addition, the previous solution is deprecated in [1] may cause system hang.\n[1] https://lore.kernel.org/all/[email protected]"}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: f2fs: compress: fix UAF de f2fs_inode_info en f2fs_free_dic El decompress_io_ctx puede liberarse de forma as\u00edncrona tras la finalizaci\u00f3n de la E/S. Si este archivo se elimina inmediatamente despu\u00e9s de la lectura, y el kworker del procesamiento de post_read_wq a\u00fan no se ha ejecutado debido a las altas cargas de trabajo, es posible que el inodo (f2fs_inode_info) se desaloje y se libere antes de que se use f2fs_free_dic. El caso de UAF como se muestra a continuaci\u00f3n: Hilo A Hilo B - f2fs_decompress_end_io - f2fs_put_dic - queue_work a\u00f1adir trabajo free_dic a post_read_wq - do_unlink - iput - evict - call_rcu Este archivo se elimina tras la lectura. Hilo C kworker para procesar post_read_wq - rcu_do_batch - f2fs_free_inode - kmem_cache_free inodo liberado por rcu - process_scheduled_works - f2fs_late_free_dic - f2fs_free_dic - f2fs_release_decomp_mem lectura (dic->inode)->i_compress_algorithm). Este parche almacena compress_algorithm y sbi en dic para evitar el UAF del inodo. Adem\u00e1s, la soluci\u00f3n anterior est\u00e1 obsoleta en [1] y puede causar un bloqueo del sistema. [1] https://lore.kernel.org/all/[email protected]"}], "id": "CVE-2025-38627", "lastModified": "2025-11-26T17:09:54.323", "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": "2025-08-22T16:15:36.337", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/39868685c2a94a70762bc6d77dc81d781d05bff5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8fae5b6addd5f6895e03797b56e3c7b9f9cd15c9"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "[email protected]", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: f2fs: compress: fix UAF of f2fs_inode_info in f2fs_free_dic", "id": "2390391", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2390391"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "details": ["No description is available for this CVE."], "name": "CVE-2025-38627", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "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": "2025-08-22T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-38627\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-38627\nhttps://lore.kernel.org/linux-cve-announce/2025082231-CVE-2025-38627-7cb6@gregkh/T"], "threat_severity": "Moderate"}