CVE-2025-26599 Xorg: xwayland: use of uninitialized pointer in compredirectwindow()
An uninitialized pointer in Xorg/Xwayland can cause a crash when memory allocation fails, leading to denial of service.
- 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-2025-26599?
CVE-2025-26599 is a high-severity vulnerability in Redhat Enterprise Linux, published on 25 Feb 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
An access to an uninitialized pointer flaw was found in X.Org and Xwayland. The function compCheckRedirect() may fail if it cannot allocate the backing pixmap. In that case, compRedirectWindow() will return a BadAlloc error without validating the window tree marked just before, which leaves the validated data partly initialized and the use of an uninitialized pointer later.
Weakness: CWE-824
Which versions are affected by CVE-2025-26599?
It affects 4 products.
Products include Redhat Enterprise Linux, Tigervnc Tigervnc, X.org X Server, X.org Xwayland.
How do I fix CVE-2025-26599?
Apply the vendor's patch.
Is CVE-2025-26599 being exploited?
There is no known exploitation of CVE-2025-26599 in the wild and no public exploit code.
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Sources
Also known as AZL-57298, AZL-57318, AZL-57446, BELL-CVE-2025-26599, DEBIAN-CVE-2025-26599, GHSA-wv34-xcj8-f3mq and 1 more.