CVE-2026-50261 | 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.
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.
- 🔗 access.redhat.com/errata/RHSA-2026:26562
- 🔗 access.redhat.com/errata/RHSA-2026:26566
- 🔗 access.redhat.com/errata/RHSA-2026:26590
- 🔗 access.redhat.com/errata/RHSA-2026:26610
- 🔗 access.redhat.com/errata/RHSA-2026:26709
- 🔗 access.redhat.com/errata/RHSA-2026:28923
- 🔗 access.redhat.com/errata/RHSA-2026:29844
- 🔗 access.redhat.com/errata/RHSA-2026:36083
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| Tier | 2026-08-29 | 2026-09-12 |
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CVE-2026-50261 | 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.
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