Out-of-Bounds Read Vulnerability in X.Org X Server Affecting Red Hat
CVE-2026-34002

6.1MEDIUM

Key Information:

Vendor

Red Hat
Status
Red Hat Enterprise Linux 10
Red Hat Enterprise Linux 6
Red Hat Enterprise Linux 7
Red Hat Enterprise Linux 8
Vendor
CVE Published:
5 May 2026

What is CVE-2026-34002?

A flaw has been identified in the X.Org X server that pertains to its handling of the XKB (X Keyboard Extension) modifier map. This out-of-bounds read vulnerability allows an attacker with access to the X11 server to exploit the system by sending a specially crafted request. Such an exploit can lead to the server reading beyond its intended memory limits, which can expose sensitive information or potentially crash the server, causing a denial of service. It is essential for users to ensure their systems are updated to mitigate any risks associated with this vulnerability.

References

https://access.redhat.com/security/cve/CVE-2026-34002
vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2451112
issue-trackingx_refsource_REDHAT

CVSS V3.1

Score:
6.1
Severity:
MEDIUM
Confidentiality:
High
Integrity:
None
Availability:
High
Attack Vector:
Local
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Red Hat would like to thank Jan-Niklas Sohn (TrendAI Zero Day Initiative) for reporting this issue.
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