CVE-2026-50261

Published: Giu 05, 2026 Last Modified: Giu 05, 2026
ExploitDB:
Other exploit source:
Google Dorks:
HIGH 7,8
Source: [email protected]
Attack Vector: local
Attack Complexity: low
Privileges Required: low
User Interaction: none
Scope: unchanged
Confidentiality: high
Integrity: high
Availability: high

Description

AI Translation Available

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.

416

Use After Free

Stable
Abstraction: Variant Structure: Simple
Common Consequences
Security Scopes Affected:
Integrity Availability Confidentiality
Potential Impacts:
Modify Memory Dos: Crash, Exit, Or Restart Read Memory Execute Unauthorized Code Or Commands
Applicable Platforms
Languages: Memory-Unsafe, C, C++
Likelihood of Exploit: High
View CWE Details
https://access.redhat.com/security/cve/CVE-2026-50261
https://access.redhat.com/security/cve/CVE-2026-50261
https://bugzilla.redhat.com/show_bug.cgi?id=2485386
https://bugzilla.redhat.com/show_bug.cgi?id=2485386
https://gitlab.freedesktop.org/xorg/xserver/-/commit/bdd7bf…
https://gitlab.freedesktop.org/xorg/xserver/-/commit/bdd7bf57af208b1ddf57d4683d…
https://lists.x.org/archives/xorg-announce/2026-June/003702…
https://lists.x.org/archives/xorg-announce/2026-June/003702.html
https://redhat.atlassian.net/browse/PSIRTSUPT-16950
https://redhat.atlassian.net/browse/PSIRTSUPT-16950