CVE-2026-31666

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.

• https://git.kernel.org/stable/c/316fb1b3169efb081d2db910cbbfef445afa03b9Patch
• https://git.kernel.org/stable/c/4125a194db4a6cf91f619f38788272651cb97dcePatch
• https://git.kernel.org/stable/c/450e6a685d0cad95b15f8af152057bd0bf79f50bPatch
• https://git.kernel.org/stable/c/ab1e022379c3c811aa72da8eb0c7507859a1d0f5Patch

Published

Apr 24, 2026

Last Modified

Jun 17, 2026

Status

Analyzed

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