What is CVE-2026-31666?

CVE-2026-31666 is a high-severity vulnerability in Linux. CVSS score: 7.8/10. Published 2026-04-24.

How severe is CVE-2026-31666?

High severity. CVSS v3 base score is 7.8 out of 10.

Vulnerability in Linux

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(…

EPSS: 0.000 (3.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Affected products

Linux — versions 1618aa3c2e0163f5ac34d514ae89474521910536, 6.10, 0

References

git.kernel.org/stable/c/4125a194db4a6cf91f619f38788272651cb97dce
git.kernel.org/stable/c/450e6a685d0cad95b15f8af152057bd0bf79f50b
git.kernel.org/stable/c/ab1e022379c3c811aa72da8eb0c7507859a1d0f5
git.kernel.org/stable/c/316fb1b3169efb081d2db910cbbfef445afa03b9

Frequently asked questions

What is CVE-2026-31666?: CVE-2026-31666 is a high-severity vulnerability in Linux. CVSS score: 7.8/10. Published 2026-04-24.
How severe is CVE-2026-31666?: High severity. CVSS v3 base score is 7.8 out of 10.