---
id: CVE-2026-80955
title: >-
  kernel: dm-pcache: fix use-after-free and invalid seg operations in
  kset_replay() (CVE-2026-80955)
summary: >-
  A flaw was found in the Linux kernel's dm-pcache component. This
  vulnerability, a use-after-free, occurs within the `kset_replay` function when
  a stale key's segment generation is accessed after it has been freed. This
  could allow a local …
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-825
vendor: Red Hat
product: Linux
affected:
  - >-
    Linux >= 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 <
    1894fc7a3bab90143dcd26ef8ee27040ef4a7501
  - >-
    Linux >= 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 <
    f39a3e9cc5946473e16d6f5071b2ee0216c56d06
  - >-
    Linux >= 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 <
    c2e894eac398b258f12fdec73ed6ba081047f7b3
  - Linux 6.18
published: '2026-09-11'
updated: '2026-09-14'
sourceUpdated: '2026-09-14T14:48:39+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80955.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80955.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-80955'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532031'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-80955'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-80955'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-80955.mbox
  - url: 'https://git.kernel.org/stable/c/1894fc7a3bab90143dcd26ef8ee27040ef4a7501'
  - url: 'https://git.kernel.org/stable/c/f39a3e9cc5946473e16d6f5071b2ee0216c56d06'
  - url: 'https://git.kernel.org/stable/c/c2e894eac398b258f12fdec73ed6ba081047f7b3'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
  - score-dispute
epss: 0.00168
epssPercentile: 0.05395
scores:
  vendor: 5.5
  cna: 7.8
ingestedAt: '2026-09-14T15:23:07.476Z'
---

## Overview

A flaw was found in the Linux kernel's dm-pcache component. This vulnerability, a use-after-free, occurs within the `kset_replay` function when a stale key's segment generation is accessed after it has been freed. This could allow a local attacker to potentially cause a system crash or lead to other unpredictable system behavior.

## Vendor advisories

- **Red Hat VEX** · Moderate · updated 2026-09-14 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80955.json)

**kernel: dm-pcache: fix use-after-free and invalid seg operations in kset_replay()** — 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.