xfs: fail recovery on a committed log item with no regions

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Summary

CVECVE-2026-64187
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-20 17:18:21 UTC
Updated2026-07-20 17:18:21 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: xfs: fail recovery on a committed log item with no regions If the first op of a transaction is a bare transaction header (len == sizeof(struct xfs_trans_header)), xlog_recover_add_to_trans() adds an item but no region, leaving it on r_itemq with ri_cnt == 0 and ri_buf == NULL. The header can be split across op records, so later ops may still add regions; the item is only invalid if the transaction commits with none. The runtime commit path never emits such a transaction, so this only happens on a crafted log. It came from an AI-assisted code audit of the recovery parser. xlog_recover_reorder_trans() calls ITEM_TYPE() on the item, which reads *(unsigned short *)item->ri_buf[0].iov_base and faults on the NULL ri_buf. Reject it there, before the commit handlers that also read ri_buf[0]. KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] RIP: 0010:xlog_recover_reorder_trans (fs/xfs/xfs_log_recover.c:1836) xlog_recover_commit_trans (fs/xfs/xfs_log_recover.c:2043) xlog_recover_process_data (fs/xfs/xfs_log_recover.c:2501) xlog_do_recovery_pass (fs/xfs/xfs_log_recover.c:3244) xlog_recover (fs/xfs/xfs_log_recover.c:3493) xfs_log_mount (fs/xfs/xfs_log.c:618) xfs_mountfs (fs/xfs/xfs_mount.c:1034) xfs_fs_fill_super (fs/xfs/xfs_super.c:1938) vfs_get_tree (fs/super.c:1695) path_mount (fs/namespace.c:4161) __x64_sys_mount (fs/namespace.c:4367)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 89cebc8477290b152618ffa110bbeae340d50900 d50b1fd066d66ceb548ba43e332cfe8a47e5e55a git Not specified
CNA Linux Linux affected 89cebc8477290b152618ffa110bbeae340d50900 d98f22d2e11e0a36493aeb25b2933571ee90d9a4 git Not specified
CNA Linux Linux affected 89cebc8477290b152618ffa110bbeae340d50900 cccbabeb9a18fcb978d76d6047f2b59214aa7749 git Not specified
CNA Linux Linux affected 89cebc8477290b152618ffa110bbeae340d50900 2094dab19d45c487285617b7b68913d0cc0c1211 git Not specified
CNA Linux Linux affected 4.3 Not specified
CNA Linux Linux unaffected 4.3 semver Not specified
CNA Linux Linux unaffected 6.12.96 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.39 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.4 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2-rc4 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/2094dab19d45c487285617b7b68913d0cc0c1211 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d98f22d2e11e0a36493aeb25b2933571ee90d9a4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d50b1fd066d66ceb548ba43e332cfe8a47e5e55a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/cccbabeb9a18fcb978d76d6047f2b59214aa7749 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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