CVE-2026-50260
High · 7.8CVSS
7.8
EPSS
0.2%
Published
Jun 5, 2026
CISA due date
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The record
A use-after-free flaw was found in the X.Org X server and Xwayland in FreeCounter(). A client that sets up multiple SyncCounters and awaits on those triggers can trigger a use-after-free when destroying those counters via a second client connection. This may be used to crash the server, or for privilege escalation if the X server runs as root.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
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