---
id: CVE-2026-80960
title: >-
  kernel: dm-pcache: validate on-media seg_num against the cache device size
  (CVE-2026-80960)
summary: >-
  A flaw was found in the Linux kernel's dm-pcache component. A local attacker
  with CAP_SYS_ADMIN capabilities can exploit this vulnerability by supplying a
  specially crafted cache device. The seg_num value, which dictates the size of
  cache …
severity: medium
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'
cvssSource: vendor
cwe: CWE-787
vendor: Red Hat
product: Linux
affected:
  - >-
    Linux >= 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 <
    91b93fe5cf4d62d5ecc642a6c8f15a3c11b00e3c
  - >-
    Linux >= 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 <
    e889c0ee81165fc90aad2979b51f930f77895703
  - >-
    Linux >= 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 <
    62d92e45abe9e087370f9fc5d876b95673aced34
  - Linux 6.18
published: '2026-09-11'
updated: '2026-09-14'
sourceUpdated: '2026-09-14T17:36:30+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80960.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80960.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-80960'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532483'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-80960'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-80960'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-80960.mbox
  - url: 'https://git.kernel.org/stable/c/91b93fe5cf4d62d5ecc642a6c8f15a3c11b00e3c'
  - url: 'https://git.kernel.org/stable/c/e889c0ee81165fc90aad2979b51f930f77895703'
  - url: 'https://git.kernel.org/stable/c/62d92e45abe9e087370f9fc5d876b95673aced34'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
epss: 0.00198
epssPercentile: 0.09836
ingestedAt: '2026-09-14T00:35:28.532Z'
---

## Overview

A flaw was found in the Linux kernel's dm-pcache component. A local attacker with CAP_SYS_ADMIN capabilities can exploit this vulnerability by supplying a specially crafted cache device. The seg_num value, which dictates the size of cache segments, is not adequately validated against the actual device size. This oversight can lead to an out-of-bounds write of 12 KiB into the kernel heap during table load, potentially resulting in a denial of service or other system compromise.

## Vendor advisories

- **Red Hat VEX** · Moderate · updated 2026-09-14 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80960.json)

**kernel: dm-pcache: validate on-media seg_num against the cache device size** — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-14.

Not affected:

- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
- Red Hat OpenShift Container Platform 4

## Remediation

Refer to the advisory for fix availability.