---
id: CVE-2026-89654
title: >-
  kernel: ceph: fix UAF in check_new_map() on session freed during unlock
  (CVE-2026-89654)
summary: >-
  A flaw was found in the Ceph file system component of the Linux kernel. A race
  condition exists in the `check_new_map()` function during session handling.
  This allows a local attacker to exploit a use-after-free vulnerability by
  freeing a …
severity: high
cvss: 7
cvssVector: 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H'
cvssSource: vendor
cwe: CWE-364
vendor: Red Hat
product: Red Hat Enterprise Linux 9
affected:
  - enterprise_linux 10
  - enterprise_linux 7
  - enterprise_linux 8
  - enterprise_linux 9
  - openshift_container_platform 4
published: '2026-09-11'
updated: '2026-09-14'
sourceUpdated: '2026-09-14T16:47:13+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89654.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89654.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-89654'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532045'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-89654'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89654'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89654.mbox
  - url: 'https://git.kernel.org/stable/c/21d5be092d947f8d83f76f7ebf3989e7e9230a98'
  - url: 'https://git.kernel.org/stable/c/ee611a7509554c4ca1f54f6aefe592fb1df7ea70'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
  - score-dispute
epss: 0.00553
epssPercentile: 0.43779
scores:
  vendor: 4.7
  cna: 9.8
ingestedAt: '2026-09-14T15:23:07.473Z'
---

## Overview

A flaw was found in the Ceph file system component of the Linux kernel. A race condition exists in the `check_new_map()` function during session handling. This allows a local attacker to exploit a use-after-free vulnerability by freeing a session while another thread attempts to access it. This could lead to a denial of service or potentially arbitrary code execution.

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, … · updated 2026-09-14 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89654.json)

**kernel: ceph: fix UAF in check_new_map() on session freed during unlock** — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-14.

Affected:

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

No fix planned:

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

Not affected:

- Red Hat Enterprise Linux 6

## Remediation

Affected