Out-of-Bounds Memory Access in X.Org X Server Affects Red Hat Products
CVE-2026-34003

7.8HIGH

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:
23 April 2026

What is CVE-2026-34003?

A flaw has been identified in X.Org X server's validation of XKB key types requests. This vulnerability allows a local attacker to craft specific requests that exploit memory access vulnerabilities, potentially leading to the exposure of sensitive information or causing the X server to crash, resulting in a Denial of Service (DoS). Under certain configurations, the impact could be even more severe, making this a significant concern for systems relying on X.Org X Server for graphical interfaces.

References

https://access.redhat.com/security/cve/CVE-2026-34003
vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2451113
issue-trackingx_refsource_REDHAT

CVSS V3.1

Score:
7.8
Severity:
HIGH
Confidentiality:
High
Integrity:
High
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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