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Affected Component
Analysis
xwayland
Exploitable
Name
CVE-2026-50257
Description
A use-after-free flaw was found in the X.Org X server and Xwayland in miSyncDestroyFence(). A client that sets up multiple fence triggers can trigger a use-after-free function pointer call. An attacker would connect to the X server to set up a fence and await that fence, then a second X connection destroys the fence, causing the use-after-free. This may be used to crash the server, or for privilege escalation if the X server runs as root.
CWEs
Published Date
Updated Date
Workaround
-
Advisories
https://access.redhat.com/security/cve/CVE-2026-50257Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2485382Issue Tracking
https://redhat.atlassian.net/browse/PSIRTSUPT-16950Permissions Required
Analysis#
Vulnerability Ratings#
7.8
CVSSv31
NaN
other