CVE-2026-50261EPSS p9.0%
CVE-2026-50261CVE-2026-50261
x.org / x_server
Description
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.
Scoring
| CVSS | 7.8 () |
| Vector | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| EPSS | 0.19% probability of exploitation · percentile 9.0% · 2026-06-18T12:00:27Z |
| Last modified | 2026-06-15 |
Related by meaning· 6
Nearest entities by semantic similarity across the cs-graph corpus.