CVSS 3.1
7.8 highCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HCVE-2026-50260
High (7.8). EPSS 0.2% chance of exploitation in the next 30 days.
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.
Severity
- EPSS
- 0.2% chance of exploitation in the next 30 days; higher than 4% of CVEs (scores of 2026-11-01)
- CWE
- CWE-416
- Published
- Modified
- Record from
- the NVD, synced
Affected
- redhat:enterprise_linux
- x.org:x_server
- x.org:xwayland