{"dataType": "CVE_RECORD", "dataVersion": "5.1", "cveMetadata": {"cveId": "CVE-2023-53311", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-09-16T16:08:59.562Z", "datePublished": "2025-09-16T16:11:49.099Z", "dateUpdated": "2025-09-16T16:11:49.099Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2025-09-16T16:11:49.099Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnilfs2: fix use-after-free of nilfs_root in dirtying inodes via iput\n\nDuring unmount process of nilfs2, nothing holds nilfs_root structure after\nnilfs2 detaches its writer in nilfs_detach_log_writer(). Previously,\nnilfs_evict_inode() could cause use-after-free read for nilfs_root if\ninodes are left in \"garbage_list\" and released by nilfs_dispose_list at\nthe end of nilfs_detach_log_writer(), and this bug was fixed by commit\n9b5a04ac3ad9 (\"nilfs2: fix use-after-free bug of nilfs_root in\nnilfs_evict_inode()\").\n\nHowever, it turned out that there is another possibility of UAF in the\ncall path where mark_inode_dirty_sync() is called from iput():\n\nnilfs_detach_log_writer()\n nilfs_dispose_list()\n iput()\n mark_inode_dirty_sync()\n __mark_inode_dirty()\n nilfs_dirty_inode()\n __nilfs_mark_inode_dirty()\n nilfs_load_inode_block() --> causes UAF of nilfs_root struct\n\nThis can happen after commit 0ae45f63d4ef (\"vfs: add support for a\nlazytime mount option\"), which changed iput() to call\nmark_inode_dirty_sync() on its final reference if i_state has I_DIRTY_TIME\nflag and i_nlink is non-zero.\n\nThis issue appears after commit 28a65b49eb53 (\"nilfs2: do not write dirty\ndata after degenerating to read-only\") when using the syzbot reproducer,\nbut the issue has potentially existed before.\n\nFix this issue by adding a \"purging flag\" to the nilfs structure, setting\nthat flag while disposing the \"garbage_list\" and checking it in\n__nilfs_mark_inode_dirty().\n\nUnlike commit 9b5a04ac3ad9 (\"nilfs2: fix use-after-free bug of nilfs_root\nin nilfs_evict_inode()\"), this patch does not rely on ns_writer to\ndetermine whether to skip operations, so as not to break recovery on\nmount. The nilfs_salvage_orphan_logs routine dirties the buffer of\nsalvaged data before attaching the log writer, so changing\n__nilfs_mark_inode_dirty() to skip the operation when ns_writer is NULL\nwill cause recovery write to fail. The purpose of using the cleanup-only\nflag is to allow for narrowing of such conditions."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/nilfs2/inode.c", "fs/nilfs2/segment.c", "fs/nilfs2/the_nilfs.h"], "versions": [{"version": "0ae45f63d4ef8d8eeec49c7d8b44a1775fff13e8", "lessThan": "11afd67f1b3c28eb216e50a3ca8dbcb69bb71793", "status": "affected", "versionType": "git"}, {"version": "0ae45f63d4ef8d8eeec49c7d8b44a1775fff13e8", "lessThan": "a3c3b4cbf9b8554120fb230e6516e980c6277487", "status": "affected", "versionType": "git"}, {"version": "0ae45f63d4ef8d8eeec49c7d8b44a1775fff13e8", "lessThan": "d2c539c216cce74837a9cf5804eb205939b82227", "status": "affected", "versionType": "git"}, {"version": "0ae45f63d4ef8d8eeec49c7d8b44a1775fff13e8", "lessThan": "37207240872456fbab44a110bde6640445233963", "status": "affected", "versionType": "git"}, {"version": "0ae45f63d4ef8d8eeec49c7d8b44a1775fff13e8", "lessThan": "3645510cf926e6af2f4d44899370d7e5331c93bd", "status": "affected", "versionType": "git"}, {"version": "0ae45f63d4ef8d8eeec49c7d8b44a1775fff13e8", "lessThan": "7532ff6edbf5242376b24a95a2fefb59bb653e5a", "status": "affected", "versionType": "git"}, {"version": "0ae45f63d4ef8d8eeec49c7d8b44a1775fff13e8", "lessThan": "5828d5f5dc877dcfdd7b23102e978e2ecfd86d82", "status": "affected", "versionType": "git"}, {"version": "0ae45f63d4ef8d8eeec49c7d8b44a1775fff13e8", "lessThan": "f8654743a0e6909dc634cbfad6db6816f10f3399", "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/nilfs2/inode.c", "fs/nilfs2/segment.c", "fs/nilfs2/the_nilfs.h"], "versions": [{"version": "4.0", "status": "affected"}, {"version": "0", "lessThan": "4.0", "status": "unaffected", "versionType": "semver"}, {"version": "4.14.323", "lessThanOrEqual": "4.14.*", "status": "unaffected", "versionType": "semver"}, {"version": "4.19.292", "lessThanOrEqual": "4.19.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.4.254", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.191", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.127", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.46", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.4.11", "lessThanOrEqual": "6.4.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.5", "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": "4.0", "versionEndExcluding": "4.14.323"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.0", "versionEndExcluding": "4.19.292"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.0", "versionEndExcluding": "5.4.254"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.0", "versionEndExcluding": "5.10.191"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.0", "versionEndExcluding": "5.15.127"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.0", "versionEndExcluding": "6.1.46"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.0", "versionEndExcluding": "6.4.11"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.0", "versionEndExcluding": "6.5"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/11afd67f1b3c28eb216e50a3ca8dbcb69bb71793"}, {"url": "https://git.kernel.org/stable/c/a3c3b4cbf9b8554120fb230e6516e980c6277487"}, {"url": "https://git.kernel.org/stable/c/d2c539c216cce74837a9cf5804eb205939b82227"}, {"url": "https://git.kernel.org/stable/c/37207240872456fbab44a110bde6640445233963"}, {"url": "https://git.kernel.org/stable/c/3645510cf926e6af2f4d44899370d7e5331c93bd"}, {"url": "https://git.kernel.org/stable/c/7532ff6edbf5242376b24a95a2fefb59bb653e5a"}, {"url": "https://git.kernel.org/stable/c/5828d5f5dc877dcfdd7b23102e978e2ecfd86d82"}, {"url": "https://git.kernel.org/stable/c/f8654743a0e6909dc634cbfad6db6816f10f3399"}], "title": "nilfs2: fix use-after-free of nilfs_root in dirtying inodes via iput", "x_generator": {"engine": "bippy-1.2.0"}}}}

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{"cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnilfs2: fix use-after-free of nilfs_root in dirtying inodes via iput\n\nDuring unmount process of nilfs2, nothing holds nilfs_root structure after\nnilfs2 detaches its writer in nilfs_detach_log_writer(). Previously,\nnilfs_evict_inode() could cause use-after-free read for nilfs_root if\ninodes are left in \"garbage_list\" and released by nilfs_dispose_list at\nthe end of nilfs_detach_log_writer(), and this bug was fixed by commit\n9b5a04ac3ad9 (\"nilfs2: fix use-after-free bug of nilfs_root in\nnilfs_evict_inode()\").\n\nHowever, it turned out that there is another possibility of UAF in the\ncall path where mark_inode_dirty_sync() is called from iput():\n\nnilfs_detach_log_writer()\n nilfs_dispose_list()\n iput()\n mark_inode_dirty_sync()\n __mark_inode_dirty()\n nilfs_dirty_inode()\n __nilfs_mark_inode_dirty()\n nilfs_load_inode_block() --> causes UAF of nilfs_root struct\n\nThis can happen after commit 0ae45f63d4ef (\"vfs: add support for a\nlazytime mount option\"), which changed iput() to call\nmark_inode_dirty_sync() on its final reference if i_state has I_DIRTY_TIME\nflag and i_nlink is non-zero.\n\nThis issue appears after commit 28a65b49eb53 (\"nilfs2: do not write dirty\ndata after degenerating to read-only\") when using the syzbot reproducer,\nbut the issue has potentially existed before.\n\nFix this issue by adding a \"purging flag\" to the nilfs structure, setting\nthat flag while disposing the \"garbage_list\" and checking it in\n__nilfs_mark_inode_dirty().\n\nUnlike commit 9b5a04ac3ad9 (\"nilfs2: fix use-after-free bug of nilfs_root\nin nilfs_evict_inode()\"), this patch does not rely on ns_writer to\ndetermine whether to skip operations, so as not to break recovery on\nmount. The nilfs_salvage_orphan_logs routine dirties the buffer of\nsalvaged data before attaching the log writer, so changing\n__nilfs_mark_inode_dirty() to skip the operation when ns_writer is NULL\nwill cause recovery write to fail. The purpose of using the cleanup-only\nflag is to allow for narrowing of such conditions."}], "id": "CVE-2023-53311", "lastModified": "2025-09-16T17:15:36.967", "metrics": {}, "published": "2025-09-16T17:15:36.967", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/11afd67f1b3c28eb216e50a3ca8dbcb69bb71793"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/3645510cf926e6af2f4d44899370d7e5331c93bd"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/37207240872456fbab44a110bde6640445233963"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/5828d5f5dc877dcfdd7b23102e978e2ecfd86d82"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/7532ff6edbf5242376b24a95a2fefb59bb653e5a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/a3c3b4cbf9b8554120fb230e6516e980c6277487"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/d2c539c216cce74837a9cf5804eb205939b82227"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f8654743a0e6909dc634cbfad6db6816f10f3399"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

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