CVE-2026-34000 — MEDIUM (6.1)

Vulnerability Description

A flaw was found in the X.Org X server. This out-of-bounds read vulnerability in the XKB geometry processing, specifically within the `CheckSetGeom()` and `XkbAddGeomKeyAlias` functions, allows an attacker to read uninitialized or out-of-bounds memory. An attacker with a connection to the X11 server, either locally or remotely, can exploit this without user interaction. This could lead to the disclosure of memory contents or cause a denial of service by crashing the server.

CVSS Score

6.1

MEDIUM

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

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

HIGH

Integrity

NONE

Availability

LOW

Affected Products

Vendor	Product	Versions
X.Org	X Server	-
Redhat	Enterprise Linux	6.0

Related Weaknesses (CWE)

CWE-125

References

https://access.redhat.com/errata/RHSA-2026:19342
https://access.redhat.com/security/cve/CVE-2026-34000Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2451107Issue TrackingThird Party Advisory

FAQ

What is CVE-2026-34000?

CVE-2026-34000 is a vulnerability with a CVSS score of 6.1 (MEDIUM). A flaw was found in the X.Org X server. This out-of-bounds read vulnerability in the XKB geometry processing, specifically within the `CheckSetGeom()` and `XkbAddGeomKeyAlias` functions, allows an att...

How severe is CVE-2026-34000?

CVE-2026-34000 has been rated MEDIUM with a CVSS base score of 6.1/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-34000?

Check the references section above for vendor advisories and patch information. Affected products include: X.Org X Server, Redhat Enterprise Linux.