CVE-2026-50261
7.8 HIGHA use-after-free flaw was found in the X.Org X server and Xwayland in SyncChangeCounter()
Published: 2026-06-05 · Last updated: 2026-06-05
Severity and scoring
- CVSS
- 7.8 HIGH
- Vector
- CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- CWE
- CWE-416
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.
Source: NVD
References
- [NVD]https://nvd.nist.gov/vuln/detail/CVE-2026-50261
- [Other]https://access.redhat.com/security/cve/CVE-2026-50261
- [Other]https://bugzilla.redhat.com/show_bug.cgi?id=2485386
- [Other]https://gitlab.freedesktop.org/xorg/xserver/-/commit/bdd7bf57af208b1ddf57d4683d67104443b44812
- [Other]https://lists.x.org/archives/xorg-announce/2026-June/003702.html
- [Other]https://redhat.atlassian.net/browse/PSIRTSUPT-16950
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