{ "schemaVersion": 1, "attribution": [ { "source": "CISA Known Exploited Vulnerabilities", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog", "licence": "US government work" }, { "source": "GitHub Advisory Database", "url": "https://github.com/advisories", "licence": "CC BY 4.0" }, { "source": "Have I Been Pwned", "url": "https://haveibeenpwned.com/", "licence": "CC BY 4.0" }, { "source": "CVE Program (CVE records)", "url": "https://www.cve.org/Legal/TermsOfUse", "licence": "CVE Terms of Use", "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.", "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy." }, { "source": "FIRST EPSS", "url": "https://www.first.org/epss/", "licence": "free to use; FIRST requests attribution" } ], "record": { "id": "CVE-2023-53311", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2023-53311", "idYear": 2023, "status": "PUBLISHED", "publishedAt": "2025-09-16T16:11:49.099Z", "updatedAt": "2026-08-05T09:13:26.871Z", "importedAt": "2026-10-24T01:57:03.413Z", "snapshot": { "id": "cve_2026-10-24_midnight_baseline", "at": "2026-10-24T00:00:00.000Z", "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z" }, "facts": { "title": "nilfs2: fix use-after-free of nilfs_root in dirtying inodes via iput", "summary": "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": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "0ae45f63d4ef8d8eeec49c7d8b44a1775fff13e8", "status": "affected", "versionType": "git", "lessThan": "11afd67f1b3c28eb216e50a3ca8dbcb69bb71793" }, { "version": "0ae45f63d4ef8d8eeec49c7d8b44a1775fff13e8", "status": "affected", "versionType": "git", "lessThan": "a3c3b4cbf9b8554120fb230e6516e980c6277487" }, { "version": "0ae45f63d4ef8d8eeec49c7d8b44a1775fff13e8", "status": "affected", "versionType": "git", "lessThan": "d2c539c216cce74837a9cf5804eb205939b82227" }, { "version": "0ae45f63d4ef8d8eeec49c7d8b44a1775fff13e8", "status": "affected", "versionType": "git", "lessThan": "37207240872456fbab44a110bde6640445233963" }, { "version": "0ae45f63d4ef8d8eeec49c7d8b44a1775fff13e8", "status": "affected", "versionType": "git", "lessThan": "3645510cf926e6af2f4d44899370d7e5331c93bd" }, { "version": "0ae45f63d4ef8d8eeec49c7d8b44a1775fff13e8", "status": "affected", "versionType": "git", "lessThan": "7532ff6edbf5242376b24a95a2fefb59bb653e5a" }, { "version": "0ae45f63d4ef8d8eeec49c7d8b44a1775fff13e8", "status": "affected", "versionType": "git", "lessThan": "5828d5f5dc877dcfdd7b23102e978e2ecfd86d82" }, { "version": "0ae45f63d4ef8d8eeec49c7d8b44a1775fff13e8", "status": "affected", "versionType": "git", "lessThan": "f8654743a0e6909dc634cbfad6db6816f10f3399" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "4.0", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "4.0" }, { "version": "4.14.323", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "4.14.*" }, { "version": "4.19.292", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "4.19.*" }, { "version": "5.4.254", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.4.*" }, { "version": "5.10.191", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.10.*" }, { "version": "5.15.127", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.15.*" }, { "version": "6.1.46", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.1.*" }, { "version": "6.4.11", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.4.*" }, { "version": "6.5", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }