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.
Problem types
Product status
Timeline
| 2026-03-25: | Reported to Red Hat. |
| 2026-05-05: | Made public. |
Credits
Red Hat would like to thank Jan-Niklas Sohn (TrendAI Zero Day Initiative) for reporting this issue.
References
access.redhat.com/security/cve/CVE-2026-34000
bugzilla.redhat.com/show_bug.cgi?id=2451107 (RHBZ#2451107)