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.