CVE-2026-50260
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 products
- Rocky Linux, X.Org Server, Xwayland
- X.org X Server
- < 21.1.23
- X.org Xwayland
- < 24.1.12
- Redhat Enterprise Linux
- = 7.0, 8.0, 9.0, 10.0
- CVSS 3.1
- 7.8 HIGH
- EPSS
- 0.2% (5th percentile)
- Weakness
- CWE-416
- NVD status
- Modified
- Published
- 2026-06-05
CVE-2026-50260 at NVD
No indexed exploits for CVE-2026-50260 yet
Our index is partial: it proves presence, never absence
No exploit for CVE-2026-50260 has been indexed yet. Our index is built from live traffic and upstream syncs, so this page can only say what it knows — not that no exploit exists.