Medium · published June 5, 2026
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.
| Product | Versions | Fixed in |
|---|---|---|
| x.org/x_server | < 21.1.23 | 21.1.23 |
| x.org/xwayland | < 24.1.12 | 24.1.12 |
| redhat/enterprise_linux | all versions | — |
| redhat/enterprise_linux | all versions | — |
| redhat/enterprise_linux | all versions | — |
| redhat/enterprise_linux | all versions | — |