CVE-2026-80959

dm-pcache: bound the persisted tail-position offset

State: Published
Severity: 7.8 High
Published: Sep 11, 2026
Updated: Oct 19, 2026
Reserved: Aug 26, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
3.1	7.8 High	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	Linux

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 to before ffd9a214a94f9928e54856f42b1cc3e33fb10e36Affected 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 to before 8bf7a06ca3c1611809725f58cfd573f2ffbda75fAffected 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 to before d1898576090a10d2ac2715218a652e78fb65a6b0Affected
LinuxLinux	6.18Affected before 6.18Not affected 6.18.50 through 6.18.Not affected 7.2.4 through 7.2.Not affected 7.3 and laterNot affected

References

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