btrfs: drop recovered reloc root refs on recovery failure

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-89645
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-11 20:19:50 UTC
Updated2026-09-11 20:19:50 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: btrfs: drop recovered reloc root refs on recovery failure During relocation recovery, each fs root gets a reference to its relocation root. If loading or adding a later root fails, or if the first transaction commit fails, btrfs_recover_relocation() jumps to out_unset before merge_reloc_roots() and clean_dirty_subvols(). put_reloc_control() drops the list-owned relocation root references, but it does not clear fs_root->reloc_root or drop the references owned by those pointers. Mount cleanup only drops them when BTRFS_FS_ERROR is set, so an error such as -ENOMEM while processing a later root can leave references behind. Keep temporary references to the fs roots associated during recovery. On failure, clear their reloc_root pointers and drop the corresponding references. Once the first transaction commit succeeds, drop only the temporary fs root references and let the normal merge and cleanup paths handle the relocation roots. Fault injection on a pending-relocation image confirmed the cleanup gap. With an injected first-commit failure, 25 fs roots had reloc_root set with fs_error=0. With this fix, the same failure path drops that count to 0 before mount fails.

Risk And Classification

EPSS: 0.002250000 probability, percentile 0.131770000 (date 2026-09-12)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected f44deb7442edf42abee6be25fca7e3e86061b4c9 2256d6dc5b88841a8a8b4fd9a9f04730705fb6fd git Not specified
CNA Linux Linux affected f44deb7442edf42abee6be25fca7e3e86061b4c9 8a64baeb5bbb706b83d2235c1e39f5b77183817f git Not specified
CNA Linux Linux affected f44deb7442edf42abee6be25fca7e3e86061b4c9 4d43107e807bcd92621106b07f5011411c6341a8 git Not specified
CNA Linux Linux affected f44deb7442edf42abee6be25fca7e3e86061b4c9 6d8ba4572922e336f0b59a80751b018e1e135164 git Not specified
CNA Linux Linux affected 5.7 Not specified
CNA Linux Linux unaffected 5.7 semver Not specified
CNA Linux Linux unaffected 6.12.109 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.50 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.4 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/6d8ba4572922e336f0b59a80751b018e1e135164 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2256d6dc5b88841a8a8b4fd9a9f04730705fb6fd 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/8a64baeb5bbb706b83d2235c1e39f5b77183817f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4d43107e807bcd92621106b07f5011411c6341a8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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