CVE-2026-50262
MediumCVSS 5.5Exploitation Probability (EPSS)
Low risk3th percentile - higher than 3% of all known CVEs
Summary
An out-of-bounds read flaw was found in the X.Org X server and Xwayland in __glXDisp_ChangeDrawableAttributes(). A wrong size validation check can read a client-controlled number of bytes, exceeding the request buffer, leading to information disclosure. A write path also exists but requires byte-swapped clients which is disabled by default.
Risk Assessment
The risk involves potential leakage of sensitive data from the X server memory, which could allow an attacker to remotely obtain information about the system or other users.
Recommendation
It is recommended to immediately update the X.Org X server and Xwayland to the latest patched version. Consider temporarily disabling unnecessary GLX features if an update is not possible.
Original NVD description (English source)
An out-of-bounds read flaw was found in the X.Org X server and Xwayland in __glXDisp_ChangeDrawableAttributes(). A wrong size validation check can read a client-controlled number of bytes, exceeding the request buffer, leading to information disclosure. A write path also exists but requires byte-swapped clients which is disabled by default.