CVE-2026-80959

In the Linux kernel, the following vulnerability has been resolved:

dm-pcache: bound the persisted tail-position offset

cache pos decode() takes the persisted key tail and dirty tail seg off from the cache device and addresses within the segment with it. A seg off at or past the segment data size, controllable by whoever supplies the device (CAP SYS ADMIN), reads past the segment data.

Reject a decoded seg off that is not below the segment data size.