btrfs: fix incorrect return value after changing leaf in lookup_extent_data_ref()

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Summary

CVECVE-2026-31666
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-24 15:16:46 UTC
Updated2026-04-24 17:51:40 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: btrfs: fix incorrect return value after changing leaf in lookup_extent_data_ref() After commit 1618aa3c2e01 ("btrfs: simplify return variables in lookup_extent_data_ref()"), the err and ret variables were merged into a single ret variable. However, when btrfs_next_leaf() returns 0 (success), ret is overwritten from -ENOENT to 0. If the first key in the next leaf does not match (different objectid or type), the function returns 0 instead of -ENOENT, making the caller believe the lookup succeeded when it did not. This can lead to operations on the wrong extent tree item, potentially causing extent tree corruption. Fix this by returning -ENOENT directly when the key does not match, instead of relying on the ret variable.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 1618aa3c2e0163f5ac34d514ae89474521910536 4125a194db4a6cf91f619f38788272651cb97dce git Not specified
CNA Linux Linux affected 1618aa3c2e0163f5ac34d514ae89474521910536 450e6a685d0cad95b15f8af152057bd0bf79f50b git Not specified
CNA Linux Linux affected 1618aa3c2e0163f5ac34d514ae89474521910536 ab1e022379c3c811aa72da8eb0c7507859a1d0f5 git Not specified
CNA Linux Linux affected 1618aa3c2e0163f5ac34d514ae89474521910536 316fb1b3169efb081d2db910cbbfef445afa03b9 git Not specified
CNA Linux Linux affected 6.10 Not specified
CNA Linux Linux unaffected 6.10 semver Not specified
CNA Linux Linux unaffected 6.12.82 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.23 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.13 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/ab1e022379c3c811aa72da8eb0c7507859a1d0f5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/316fb1b3169efb081d2db910cbbfef445afa03b9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4125a194db4a6cf91f619f38788272651cb97dce 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/450e6a685d0cad95b15f8af152057bd0bf79f50b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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