Description
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.
Problem types
Product status
Timeline
| 2026-05-15: | Reported to Red Hat. |
| 2026-06-02: | Made public. |
Credits
Upstream acknowledges Anonymous (Trend Micro Zero Day Initiative) as the original reporter.
References
access.redhat.com/security/cve/CVE-2026-50262
bugzilla.redhat.com/show_bug.cgi?id=2485387 (RHBZ#2485387)
gitlab.freedesktop.org/...4daf715bea8abdafa8fb130be2f8a1d145
lists.x.org/archives/xorg-announce/2026-June/003702.html
redhat.atlassian.net/browse/PSIRTSUPT-16950