# CVE-2026-80959

## Summary

- **CVE ID:** CVE-2026-80959
- **Severity:** HIGH
- **CVSS Score:** 7.8 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)
- **CWE:** N/A
- **Published:** Sep 11, 2026
- **Last Modified:** Sep 13, 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.

## Affected Products

- Linux — Linux (1d57628ff95b32d5cfa8d8f50e07690c161e9cf0)
- Linux — Linux (6.18)
- Linux — Linux (0)
- Linux — Linux (6.18.50)
- Linux — Linux (7.2.4)
- Linux — Linux (7.3-rc1)

## References

- [CNA](https://git.kernel.org/stable/c/ffd9a214a94f9928e54856f42b1cc3e33fb10e36)
- [CNA](https://git.kernel.org/stable/c/8bf7a06ca3c1611809725f58cfd573f2ffbda75f)
- [CNA](https://git.kernel.org/stable/c/d1898576090a10d2ac2715218a652e78fb65a6b0)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.13%
- **EPSS Percentile:** 2.7

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._