CVE-2026-80958

dm-pcache: clamp the tail kset read to the segment data region

State: Published
Severity: 7.1 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: clamp the tail kset read to the segment data region

The tail-kset read in cache_replay(), the writeback worker and the GC worker bounds its length by PCACHE_SEG_SIZE - seg_off, the raw segment size rather than the data region. A tail near the segment end reads past the segment data into the following control area.

Clamp the read to cache_seg_remain(), the data region.

Scores

CVSS	Score	Vector	Source
3.1	7.1 High	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H	Linux

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 to before 2cd9776fe3f2d88ec22c36d3c8ba09fbf9d5500cAffected 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 to before 1ab55354368d071ebaee4d8c82313955eab65a04Affected 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 to before becf07e2b0053027495ecd671b1f82fb2e615f68Affected
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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