Use-After-Free Flaw in X.Org X Server and Xwayland
CVE-2026-50261
Key Information:
- Vendor
Red Hat
- Status
- Vendor
- CVE Published:
- 5 June 2026
What is CVE-2026-50261?
A use-after-free vulnerability has been identified in the X.Org X server and Xwayland's SyncChangeCounter() function. This flaw allows an attacker to exploit the behavior of SyncCounters when managed by concurrent client connections. By destroying multiple SyncCounters, an unauthorized client may manipulate memory, potentially leading to server instability or unauthorized privilege escalation when the X server operates with root permissions. Mitigation measures are advised to protect against possible exploitation.
Affected Version(s)
Red Hat Enterprise Linux 10 0:24.1.9-4.el10_2.2
Red Hat Enterprise Linux 10.0 Extended Update Support 0:24.1.5-6.el10_0.1
Red Hat Enterprise Linux 7 Extended Lifecycle Support 0:1.20.4-35.el7_9
References
CVSS V3.1
Timeline
Vulnerability published
Vulnerability Reserved