---
id: CVE-2026-80957
title: >-
  kernel: dm-pcache: detect a cycle in the last-kset chain during replay
  (CVE-2026-80957)
summary: >-
  A flaw was found in the `dm-pcache` component of the Linux kernel. A local
  attacker could exploit a vulnerability in the `cache_replay()` function, which
  does not properly handle a forged `last-kset` chain. By crafting a malicious
  chain th…
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-835
vendor: Red Hat
product: Linux
affected:
  - >-
    Linux >= 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 <
    663ee2f3824a505b983162de44134e789f8230da
  - >-
    Linux >= 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 <
    5311dfc5cd70edccd110257e3f30b2c1dcd3768d
  - >-
    Linux >= 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 <
    16c3b3a326e70f246a605b3dc27b7f83ba4743e3
  - Linux 6.18
published: '2026-09-11'
updated: '2026-09-14'
sourceUpdated: '2026-09-14T15:55:01+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80957.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80957.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-80957'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532037'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-80957'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-80957'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-80957.mbox
  - url: 'https://git.kernel.org/stable/c/663ee2f3824a505b983162de44134e789f8230da'
  - url: 'https://git.kernel.org/stable/c/5311dfc5cd70edccd110257e3f30b2c1dcd3768d'
  - url: 'https://git.kernel.org/stable/c/16c3b3a326e70f246a605b3dc27b7f83ba4743e3'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
epss: 0.00206
epssPercentile: 0.09466
ingestedAt: '2026-09-14T00:35:28.532Z'
---

## Overview

A flaw was found in the `dm-pcache` component of the Linux kernel. A local attacker could exploit a vulnerability in the `cache_replay()` function, which does not properly handle a forged `last-kset` chain. By crafting a malicious chain that points back to an already visited segment, an attacker can cause an infinite loop during replay, leading to a Denial of Service (DoS) condition.

## Vendor advisories

- **Red Hat VEX** · Moderate · updated 2026-09-14 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80957.json)

**kernel: dm-pcache: detect a cycle in the last-kset chain during 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.