CVE-2026-50260

Published: Jun 5, 2026Modified: Jun 11, 2026

7.8

Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Exploitability: 1.8 / Impact: 5.9

Source: secalert@redhat.com

Description

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 (6)

Products: Redhat: Enterprise Linux · X.org: X Server, Xwayland

1 product

Enterprise Linux

2 products

Configuration A

6 vulnerable

Vulnerable Software	Affected Versions
Redhat Enterprise Linux	Version 10.0
Redhat Enterprise Linux	Version 7.0
Redhat Enterprise Linux	Version 8.0
Redhat Enterprise Linux	Version 9.0
X.org X Server	Before 21.1.23
X.org Xwayland	Before 24.1.12

Related CWEs

The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

References (5)

https://access.redhat.com/security/cve/CVE-2026-50260

Source: secalert@redhat.com

Third Party Advisory

https://bugzilla.redhat.com/show_bug.cgi?id=2485385

Source: secalert@redhat.com

Issue TrackingThird Party Advisory

https://gitlab.freedesktop.org/xorg/xserver/-/commit/f5abfb61994471023d8c6470428c8e30c411cc0b

Source: secalert@redhat.com

Patch

https://lists.x.org/archives/xorg-announce/2026-June/003702.html

Source: secalert@redhat.com

Mailing ListVendor Advisory

https://redhat.atlassian.net/browse/PSIRTSUPT-16950

Source: secalert@redhat.com

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