---
id: CVE-2026-98867
title: >-
  kernel: dm-pcache: bound the logical key offset from persistent memory
  (CVE-2026-98867)
summary: >-
  A flaw was found in the Linux kernel's Device Mapper persistent cache
  (dm-pcache) module. A local attacker capable of mounting or attaching a
  crafted persistent cache device can exploit missing boundary checks on logical
  key offsets. This …
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-787
vendor: Red Hat
product: Linux
affected:
  - >-
    Linux >= 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 <
    3d5a87cb909c1f375f08065b20123fa5db5958d8
  - >-
    Linux >= 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 <
    10449703200076980704894c3d68d6796182371b
  - >-
    Linux >= 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 <
    97fc4b53dbe4a983fdf093243067fa6a64562307
  - Linux 6.18
published: '2026-10-18'
updated: '2026-10-24'
sourceUpdated: '2026-10-24T07:31:43+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98867.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98867.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-98867'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2555244'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-98867'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-98867'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98867.mbox
  - url: 'https://git.kernel.org/stable/c/3d5a87cb909c1f375f08065b20123fa5db5958d8'
  - url: 'https://git.kernel.org/stable/c/10449703200076980704894c3d68d6796182371b'
  - url: 'https://git.kernel.org/stable/c/97fc4b53dbe4a983fdf093243067fa6a64562307'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
epss: 0.00155
epssPercentile: 0.0454
ingestedAt: '2026-10-18T16:47:32.457Z'
---

## Overview

A flaw was found in the Linux kernel's Device Mapper persistent cache (dm-pcache) module. A local attacker capable of mounting or attaching a crafted persistent cache device can exploit missing boundary checks on logical key offsets. This flaw triggers an out-of-bounds memory write during cache replay, leading to a system crash, resulting in a Denial of Service (DoS) or potential memory corruption.

## Vendor advisories

- **Red Hat VEX** · Moderate · updated 2026-10-24 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98867.json)

**kernel: dm-pcache: bound the logical key offset from persistent memory** — 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.