CVE-2026-34000 Information disclosure in Red Hat Enterprise Linux 10
An out-of-bounds read in X.Org X server allows attackers to disclose memory contents or cause a denial of service via XKB geometry processing.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-34000?
CVE-2026-34000 is a medium-severity vulnerability in Redhat Enterprise Linux, published on 5 May 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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.
Weakness: CWE-125
Which versions are affected by CVE-2026-34000?
It affects 2 products.
Products include Redhat Enterprise Linux, X.org X Server.
How do I fix CVE-2026-34000?
Apply the vendor's patch.
Is CVE-2026-34000 being exploited?
There is no known exploitation of CVE-2026-34000 in the wild and no public exploit code.
Other vulnerabilities in Redhat Enterprise Linux
- CVE-2018-14667 Red Hat JBoss RichFaces Framework Expression Language Injection
- CVE-2021-20325 Missing fixes for CVE-2021-40438 and CVE-2021-26691 in the versions of httpd, as shipped in Red Hat Enterprise Linux 8.5.0, causes a securit
- CVE-2018-25011 Memory corruption in libwebp
- CVE-2018-25014 Other in libwebp
- CVE-2014-3585 Supply chain in redhat-upgrade-tool
Sources
Also known as AZL-86211, BELL-CVE-2026-34000, CLSA-2026-1779497454, CLSA-2026-1779581754, CLSA-2026-1779798274, CLSA-2026-1780935632 and 7 more.