---
id: CVE-2025-62231
title: >-
  A flaw was identified in the X.Org X server’s X Keyboard (Xkb) extension where
  improper bounds checking in the XkbSetCompatMap() function can cause an
  unsigned short overflow
summary: >-
  A flaw was identified in the X.Org X server’s X Keyboard (Xkb) extension where
  improper bounds checking in the XkbSetCompatMap() function can cause an
  unsigned short overflow. If an attacker sends specially crafted input data,
  the value …
severity: high
cvss: 7.3
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H'
cwe:
  - CWE-190
published: '2025-10-30'
updated: '2026-06-29'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-62231'
references:
  - url: 'https://access.redhat.com/errata/RHSA-2025:19432'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2025:19433'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2025:19434'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2025:19435'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2025:19489'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2025:19623'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2025:19909'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2025:20958'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2025:20960'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2025:20961'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2025:21035'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2025:22040'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2025:22041'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2025:22051'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2025:22055'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2025:22056'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2025:22077'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2025:22096'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2025:22164'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2025:22167'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2025:22364'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2025:22365'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2025:22426'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2025:22427'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2025:22667'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2025:22729'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2025:22742'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2025:22753'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:0031'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:0033'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:0034'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:0035'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:0036'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/security/cve/CVE-2025-62231'
    label: secalert@redhat.com
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2402660'
    label: secalert@redhat.com
  - url: 'https://lists.x.org/archives/xorg-announce/2025-October/003635.html'
    label: secalert@redhat.com
  - url: 'http://www.openwall.com/lists/oss-security/2025/10/28/7'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://lists.debian.org/debian-lts-announce/2025/10/msg00033.html'
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
epss: 0.00277
epssPercentile: 0.18006
ingestedAt: '2026-06-29T21:48:47.211Z'
---

## Overview

A flaw was identified in the X.Org X server’s X Keyboard (Xkb) extension where improper bounds checking in the XkbSetCompatMap() function can cause an unsigned short overflow. If an attacker sends specially crafted input data, the value calculation may overflow, leading to memory corruption or a crash.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.