CVE-2023-53311 (GCVE-0-2023-53311)

Vulnerability from cvelistv5 – Published: 2025-09-16 16:11 – Updated: 2026-01-14 18:32
VLAI?
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: nilfs2: fix use-after-free of nilfs_root in dirtying inodes via iput During unmount process of nilfs2, nothing holds nilfs_root structure after nilfs2 detaches its writer in nilfs_detach_log_writer(). Previously, nilfs_evict_inode() could cause use-after-free read for nilfs_root if inodes are left in "garbage_list" and released by nilfs_dispose_list at the end of nilfs_detach_log_writer(), and this bug was fixed by commit 9b5a04ac3ad9 ("nilfs2: fix use-after-free bug of nilfs_root in nilfs_evict_inode()"). However, it turned out that there is another possibility of UAF in the call path where mark_inode_dirty_sync() is called from iput(): nilfs_detach_log_writer() nilfs_dispose_list() iput() mark_inode_dirty_sync() __mark_inode_dirty() nilfs_dirty_inode() __nilfs_mark_inode_dirty() nilfs_load_inode_block() --> causes UAF of nilfs_root struct This can happen after commit 0ae45f63d4ef ("vfs: add support for a lazytime mount option"), which changed iput() to call mark_inode_dirty_sync() on its final reference if i_state has I_DIRTY_TIME flag and i_nlink is non-zero. This issue appears after commit 28a65b49eb53 ("nilfs2: do not write dirty data after degenerating to read-only") when using the syzbot reproducer, but the issue has potentially existed before. Fix this issue by adding a "purging flag" to the nilfs structure, setting that flag while disposing the "garbage_list" and checking it in __nilfs_mark_inode_dirty(). Unlike commit 9b5a04ac3ad9 ("nilfs2: fix use-after-free bug of nilfs_root in nilfs_evict_inode()"), this patch does not rely on ns_writer to determine whether to skip operations, so as not to break recovery on mount. The nilfs_salvage_orphan_logs routine dirties the buffer of salvaged data before attaching the log writer, so changing __nilfs_mark_inode_dirty() to skip the operation when ns_writer is NULL will cause recovery write to fail. The purpose of using the cleanup-only flag is to allow for narrowing of such conditions.
Severity ?
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 0ae45f63d4ef8d8eeec49c7d8b44a1775fff13e8 , < 11afd67f1b3c28eb216e50a3ca8dbcb69bb71793 (git)
Affected: 0ae45f63d4ef8d8eeec49c7d8b44a1775fff13e8 , < a3c3b4cbf9b8554120fb230e6516e980c6277487 (git)
Affected: 0ae45f63d4ef8d8eeec49c7d8b44a1775fff13e8 , < d2c539c216cce74837a9cf5804eb205939b82227 (git)
Affected: 0ae45f63d4ef8d8eeec49c7d8b44a1775fff13e8 , < 37207240872456fbab44a110bde6640445233963 (git)
Affected: 0ae45f63d4ef8d8eeec49c7d8b44a1775fff13e8 , < 3645510cf926e6af2f4d44899370d7e5331c93bd (git)
Affected: 0ae45f63d4ef8d8eeec49c7d8b44a1775fff13e8 , < 7532ff6edbf5242376b24a95a2fefb59bb653e5a (git)
Affected: 0ae45f63d4ef8d8eeec49c7d8b44a1775fff13e8 , < 5828d5f5dc877dcfdd7b23102e978e2ecfd86d82 (git)
Affected: 0ae45f63d4ef8d8eeec49c7d8b44a1775fff13e8 , < f8654743a0e6909dc634cbfad6db6816f10f3399 (git)
Create a notification for this product.
    Linux Linux Affected: 4.0
Unaffected: 0 , < 4.0 (semver)
Unaffected: 4.14.323 , ≤ 4.14.* (semver)
Unaffected: 4.19.292 , ≤ 4.19.* (semver)
Unaffected: 5.4.254 , ≤ 5.4.* (semver)
Unaffected: 5.10.191 , ≤ 5.10.* (semver)
Unaffected: 5.15.127 , ≤ 5.15.* (semver)
Unaffected: 6.1.46 , ≤ 6.1.* (semver)
Unaffected: 6.4.11 , ≤ 6.4.* (semver)
Unaffected: 6.5 , ≤ * (original_commit_for_fix)
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\"lessThanOrEqual\": \"6.4.*\"}, {\"status\": \"unaffected\", \"version\": \"6.5\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"fs/nilfs2/inode.c\", \"fs/nilfs2/segment.c\", \"fs/nilfs2/the_nilfs.h\"], \"defaultStatus\": \"affected\"}], \"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\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"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() --\u003e 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.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.14.323\", \"versionStartIncluding\": \"4.0\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.292\", \"versionStartIncluding\": \"4.0\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.254\", \"versionStartIncluding\": \"4.0\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.191\", \"versionStartIncluding\": \"4.0\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.127\", \"versionStartIncluding\": \"4.0\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.46\", \"versionStartIncluding\": \"4.0\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.4.11\", \"versionStartIncluding\": \"4.0\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.5\", \"versionStartIncluding\": \"4.0\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-09-16T16:11:49.099Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2023-53311\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-01-14T18:32:57.096Z\", \"dateReserved\": \"2025-09-16T16:08:59.562Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2025-09-16T16:11:49.099Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.