CVE-2026-50257
CVE-2026-50257
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…
Vulnerability class: Use-After-Free
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-50257?
- CVE-2026-50257 is a high-severity vulnerability, classified under Use After Free. CVSS score: 7.8/10. Published 2026-06-05.
- How severe is CVE-2026-50257?
- High severity. CVSS v3 base score is 7.8 out of 10.