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CVE-2026-50261

A use-after-free flaw was found in the X.Org X server and Xwayland in SyncChangeCounter().

Impact

A use-after-free flaw was found in the X.Org X server and Xwayland in SyncChangeCounter(). A client that sets up multiple SyncCounters can trigger a use-after-free when destroying those counters via a second client connection while changing those counters. This may be used to crash the server, or for privilege escalation if the X server runs as root.

Affected products

VendorProductAffected versions
X.OrgX Server
before 21.1.23
X.OrgXwayland
before 24.1.12
RedhatEnterprise Linux
Versions 7.0, 8.0, 9.0, 10.0

Weakness classification

CWE-416

References