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If\nthe reference count hits 0 and its owner page gets unlocked, bh may be\nfreed. However, bh->b_page is dereferenced to put the page after that,\nwhich may result in a use-after-free bug. This patch moves the release\noperation after unlocking and putting the page.\n\nNOTE: The function in question is only called in GC, and in combination\nwith current userland tools, address translation using DAT does not occur\nin that function, so the code path that causes this issue will not be\nexecuted. However, it is possible to run that code path by intentionally\nmodifying the userland GC library or by calling the GC ioctl directly.\n\n[[email protected]: NOTE added to the commit log]"}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: nilfs2: soluciona el uso potencial despu\u00e9s de liberar en nilfs_gccache_submit_read_data() En nilfs_gccache_submit_read_data(), se llama a brelse(bh) para eliminar el recuento de referencias de bh cuando falla la llamada a nilfs_dat_translate(). Si el recuento de referencias llega a 0 y la p\u00e1gina del propietario se desbloquea, es posible que bh quede liberado. Sin embargo, se elimina la referencia a bh->b_page para colocar la p\u00e1gina despu\u00e9s de eso, lo que puede provocar un error de Use After Free. Este parche mueve la operaci\u00f3n de lanzamiento despu\u00e9s de desbloquear y poner la p\u00e1gina. NOTA: La funci\u00f3n en cuesti\u00f3n solo se llama en GC y, en combinaci\u00f3n con las herramientas actuales del usuario, la traducci\u00f3n de direcciones usando DAT no ocurre en esa funci\u00f3n, por lo que la ruta del c\u00f3digo que causa este problema no se ejecutar\u00e1. Sin embargo, es posible ejecutar esa ruta de c\u00f3digo modificando intencionalmente la librer\u00eda GC del \u00e1rea de usuario o llamando directamente al GC ioctl. [[email protected]: NOTA agregada al registro de confirmaci\u00f3n]"}], "id": "CVE-2023-52566", "lastModified": "2025-04-08T15:08:55.437", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}, "published": "2024-03-02T22:15:49.023", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/193b5a1c6c67c36b430989dc063fe7ea4e200a33"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/28df4646ad8b433340772edc90ca709cdefc53e2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/3936e8714907cd55e37c7cc50e50229e4a9042e8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7130a87ca32396eb9bf48b71a2d42259ae44c6c7"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7ee29facd8a9c5a26079148e36bcf07141b3a6bc"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/980663f1d189eedafd18d80053d9cf3e2ceb5c8c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/bb61224f6abc8e71bfdf06d7c984e23460875f5b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/fb1084e63ee56958b0a56e17a50a4fd86445b9c1"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/193b5a1c6c67c36b430989dc063fe7ea4e200a33"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/28df4646ad8b433340772edc90ca709cdefc53e2"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/3936e8714907cd55e37c7cc50e50229e4a9042e8"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7130a87ca32396eb9bf48b71a2d42259ae44c6c7"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7ee29facd8a9c5a26079148e36bcf07141b3a6bc"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/980663f1d189eedafd18d80053d9cf3e2ceb5c8c"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/bb61224f6abc8e71bfdf06d7c984e23460875f5b"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/fb1084e63ee56958b0a56e17a50a4fd86445b9c1"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: nilfs2: potential use after free in nilfs_gccache_submit_read_data()", "id": "2267719", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2267719"}, "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"}, "cwe": "CWE-416", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nnilfs2: fix potential use after free in nilfs_gccache_submit_read_data()\nIn nilfs_gccache_submit_read_data(), brelse(bh) is called to drop the\nreference count of bh when the call to nilfs_dat_translate() fails. If\nthe reference count hits 0 and its owner page gets unlocked, bh may be\nfreed. However, bh->b_page is dereferenced to put the page after that,\nwhich may result in a use-after-free bug. This patch moves the release\noperation after unlocking and putting the page.\nNOTE: The function in question is only called in GC, and in combination\nwith current userland tools, address translation using DAT does not occur\nin that function, so the code path that causes this issue will not be\nexecuted. However, it is possible to run that code path by intentionally\nmodifying the userland GC library or by calling the GC ioctl directly.\n[[email protected]: NOTE added to the commit log]", "A use after free flaw was found in nilfs_gccache_submit_read_data() in the Linux kernel. This may result in a crash."], "name": "CVE-2023-52566", "package_state": [{"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": "2024-03-02T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2023-52566\nhttps://nvd.nist.gov/vuln/detail/CVE-2023-52566\nhttps://lore.kernel.org/linux-cve-announce/2024030254-CVE-2023-52566-69f0@gregkh/"], "threat_severity": "Moderate"}