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.

CVSS 3.1

7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS

0.2% chance of exploitation in the next 30 days; higher than 6% of CVEs (scores of 2026-10-25)

Published

2026-09-11

Modified

2026-10-19

Record from

the NVD, synced 2026-10-19

References

• https://git.kernel.org/stable/c/8bf7a06ca3c1611809725f58cfd573f2ffbda75f
• https://git.kernel.org/stable/c/d1898576090a10d2ac2715218a652e78fb65a6b0
• https://git.kernel.org/stable/c/ffd9a214a94f9928e54856f42b1cc3e33fb10e36

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