Out-of-bounds write in Linux kernel - CVE-2026-80962

Vulnerability details

The vulnerability allows a local privileged user to perform out-of-bounds reads and writes.

The vulnerability exists due to out-of-bounds access in the dm-pcache cache metadata handling functions cache_segs_init() and get_seg_id() when loading a cache device with crafted on-disk cache metadata. A local privileged user can supply cache metadata containing an oversized segment count or an out-of-range segment identifier to perform out-of-bounds reads and writes.

Affected software

How to mitigate CVE-2026-80962

External References

• https://git.kernel.org/stable/c/32d1809da31094ef76fd98dc1f1a8b55ca1295dd
• https://git.kernel.org/stable/c/3e19172089ec81132a8a48e802b1034a744209f4
• https://git.kernel.org/stable/c/ab5dcde6fa96bc115b85f3621c60e39c66229a90

Related Security Bulletins

• Out-of-bounds write in Linux kernel md dm-pcache driver