CVE-2025-62231 Xorg: xmayland: value overflow in xkbsetcompatmap()
An attacker can cause memory corruption or a crash in the X.Org X server via crafted input triggering an integer overflow in the Xkb extension.
- 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-2025-62231?
CVE-2025-62231 is a high-severity vulnerability in Debian Debian Linux, published on 30 Oct 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A flaw was identified in the X.Org X server’s X Keyboard (Xkb) extension where improper bounds checking in the XkbSetCompatMap() function can cause an unsigned short overflow. If an attacker sends specially crafted input data, the value calculation may overflow, leading to memory corruption or a crash.
Weakness: CWE-190
Which versions are affected by CVE-2025-62231?
It affects 11 products.
Products include Debian Debian Linux, Ibm Aix, Ibm Vios, Redhat Enterprise Linux, Redhat Enterprise Linux Aus, Redhat Enterprise Linux Els and 5 more.
How do I fix CVE-2025-62231?
Apply the vendor's patch.
Is CVE-2025-62231 being exploited?
There is no known exploitation of CVE-2025-62231 in the wild and no public exploit code.
Other vulnerabilities in Debian Debian Linux
Sources
Also known as AZL-69467, BELL-CVE-2025-62231, CLSA-2025-1763138343, DEBIAN-CVE-2025-62231, GHSA-h4r4-6hvf-34r8, UBUNTU-CVE-2025-62231.