CVE-2026-34002 Information disclosure in Red Hat Enterprise Linux 10
An attacker with X11 access can trigger an out-of-bounds read in XKB handling, leading to information disclosure or server crash.
- 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-2026-34002?
CVE-2026-34002 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 vulnerability, an out-of-bounds read, affects the XKB (X Keyboard Extension) modifier map handling. An attacker with access to the X11 server can exploit this by sending a malformed request, which causes the server to read beyond its intended memory boundaries. This can lead to the exposure of sensitive information or cause the server to crash, resulting in a denial of service.
Weakness: CWE-805
Which versions are affected by CVE-2026-34002?
It affects 2 products.
Products include Redhat Enterprise Linux, X.org X Server.
How do I fix CVE-2026-34002?
Apply the vendor's patch.
Is CVE-2026-34002 being exploited?
There is no known exploitation of CVE-2026-34002 in the wild and no public exploit code.
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Sources
Also known as AZL-86208, BELL-CVE-2026-34002, CLSA-2026-1784041965, CLSA-2026-1784042725, CLSA-2026-1784103643, CLSA-2026-1786486767 and 5 more.