---
id: CVE-2026-98868
title: 'kernel: dm-pcache: reject a kset that overruns its segment (CVE-2026-98868)'
summary: >-
  A flaw was found in the Linux kernel's dm-pcache driver. A local attacker
  capable of presenting a crafted storage device with forged metadata can cause
  cache operations to exceed segment boundaries. This flaw triggers a kernel
  assertion fa…
severity: medium
cvss: 4.4
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H'
cvssSource: vendor
cwe: CWE-617
vendor: Red Hat
product: Linux
affected:
  - >-
    Linux >= 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 <
    01a700e9278da5706c865b9ca3ae70fdb7b4531d
  - >-
    Linux >= 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 <
    96e2863b1f81ea61b8d8d5d5a45d3b4c018f8e10
  - >-
    Linux >= 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 <
    7ac1f10f987a2ffae4aecf0e2ceca8f552b665cb
  - Linux 6.18
published: '2026-10-18'
updated: '2026-10-24'
sourceUpdated: '2026-10-24T07:43:25+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98868.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98868.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-98868'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2555211'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-98868'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-98868'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98868.mbox
  - url: 'https://git.kernel.org/stable/c/01a700e9278da5706c865b9ca3ae70fdb7b4531d'
  - url: 'https://git.kernel.org/stable/c/96e2863b1f81ea61b8d8d5d5a45d3b4c018f8e10'
  - url: 'https://git.kernel.org/stable/c/7ac1f10f987a2ffae4aecf0e2ceca8f552b665cb'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
epss: 0.00169
epssPercentile: 0.06239
ingestedAt: '2026-10-18T16:47:32.457Z'
---

## Overview

A flaw was found in the Linux kernel's dm-pcache driver. A local attacker capable of presenting a crafted storage device with forged metadata can cause cache operations to exceed segment boundaries. This flaw triggers a kernel assertion failure, leading to a system crash and resulting in a Denial of Service (DoS).

## Vendor advisories

- **Red Hat VEX** · Moderate · updated 2026-10-24 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98868.json)

**kernel: dm-pcache: reject a kset that overruns its segment** — rated Moderate by Red Hat. Released 2026-10-18, updated 2026-10-24.

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.