Linux kernel btrfs: fix incorrect return after leaf lookup mismatch
CVE-2026-31666 Published on April 24, 2026
btrfs: fix incorrect return value after changing leaf in lookup_extent_data_ref()
In 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.
Products Associated with CVE-2026-31666
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Affected Versions
Linux:- Version 1618aa3c2e0163f5ac34d514ae89474521910536 and below 4125a194db4a6cf91f619f38788272651cb97dce is affected.
- Version 1618aa3c2e0163f5ac34d514ae89474521910536 and below 450e6a685d0cad95b15f8af152057bd0bf79f50b is affected.
- Version 1618aa3c2e0163f5ac34d514ae89474521910536 and below ab1e022379c3c811aa72da8eb0c7507859a1d0f5 is affected.
- Version 1618aa3c2e0163f5ac34d514ae89474521910536 and below 316fb1b3169efb081d2db910cbbfef445afa03b9 is affected.
- Version 6.10 is affected.
- Before 6.10 is unaffected.
- Version 6.12.82, <= 6.12.* is unaffected.
- Version 6.18.23, <= 6.18.* is unaffected.
- Version 6.19.13, <= 6.19.* is unaffected.
- Version 7.0, <= * is unaffected.