CVE-2025-26596

HIGH

X.Org X Server < 21.1.16 and Xwayland < 24.1.6 - Heap-Based Buffer Overflow in XkbWriteKeySyms

Title source: llm

Description

A heap overflow flaw was found in X.Org and Xwayland. The computation of the length in XkbSizeKeySyms() differs from what is written in XkbWriteKeySyms(), which may lead to a heap-based buffer overflow.

References (18)

Core 18

Core References

Vendor Advisory vendor-advisory x_refsource_redhat

RHSA-2025:3976

https://access.redhat.com/errata/RHSA-2025:3976

Mailing List

https://lists.debian.org/debian-lts-announce/2025/02/msg00036.html

Third Party Advisory vendor-advisory x_refsource_redhat

https://access.redhat.com/errata/RHSA-2025:2500

Third Party Advisory vendor-advisory x_refsource_redhat

https://access.redhat.com/errata/RHSA-2025:2502

Third Party Advisory vendor-advisory x_refsource_redhat

https://access.redhat.com/errata/RHSA-2025:2861

Third Party Advisory vendor-advisory x_refsource_redhat

https://access.redhat.com/errata/RHSA-2025:2862

Third Party Advisory vendor-advisory x_refsource_redhat

https://access.redhat.com/errata/RHSA-2025:2865

Third Party Advisory vendor-advisory x_refsource_redhat

https://access.redhat.com/errata/RHSA-2025:2866

Third Party Advisory vendor-advisory x_refsource_redhat

https://access.redhat.com/errata/RHSA-2025:2873

Third Party Advisory vendor-advisory x_refsource_redhat

https://access.redhat.com/errata/RHSA-2025:2874

Third Party Advisory vendor-advisory x_refsource_redhat

https://access.redhat.com/errata/RHSA-2025:2875

Third Party Advisory vendor-advisory x_refsource_redhat

https://access.redhat.com/errata/RHSA-2025:2879

Third Party Advisory vendor-advisory x_refsource_redhat

https://access.redhat.com/errata/RHSA-2025:2880

Vendor Advisory vendor-advisory x_refsource_redhat

https://access.redhat.com/errata/RHSA-2025:7163

Vendor Advisory vendor-advisory x_refsource_redhat

https://access.redhat.com/errata/RHSA-2025:7165

Vendor Advisory vendor-advisory x_refsource_redhat

https://access.redhat.com/errata/RHSA-2025:7458

Third Party Advisory vdb-entry x_refsource_redhat

https://access.redhat.com/security/cve/CVE-2025-26596

Issue Tracking issue-tracking x_refsource_redhat

https://bugzilla.redhat.com/show_bug.cgi?id=2345256

Scores

CVSS v3 7.8

EPSS 0.0003

EPSS Percentile 10.4%

Attack Vector LOCAL

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact total

Details

CWE

CWE-787

Status published

Products (27)

Red Hat/Red Hat Enterprise Linux 10 0:24.1.5-3.el10_0

Red Hat/Red Hat Enterprise Linux 6

Red Hat/Red Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSION 0:1.1.0-25.el6_10

Red Hat/Red Hat Enterprise Linux 7 Extended Lifecycle Support 0:1.20.4-30.el7_9

Red Hat/Red Hat Enterprise Linux 7 Extended Lifecycle Support 0:1.8.0-36.el7_9

Red Hat/Red Hat Enterprise Linux 8

Red Hat/Red Hat Enterprise Linux 8 0:1.13.1-15.el8_10

Red Hat/Red Hat Enterprise Linux 8.2 Advanced Update Support 0:1.9.0-15.el8_2.13

Red Hat/Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support 0:1.11.0-8.el8_4.12

Red Hat/Red Hat Enterprise Linux 8.4 Telecommunications Update Service 0:1.11.0-8.el8_4.12

... and 17 more

Published Feb 25, 2025

Tracked Since Feb 18, 2026