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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.

CVE-2026-50261 is a use-after-free vulnerability in the SyncChangeCounter() function of the X.Org X server and Xwayland on Red Hat Enterprise Linux 10. This flaw can be triggered by a client setting up multiple SyncCounters and destroying them via a second client connection while changing those counters, leading to a use-after-free condition. Exploitation may cause the X server to crash or enable privilege escalation if the server runs with root privileges. Red Hat has released security advisories (RHSA-2026:26566) that include patches for this vulnerability along with several other related issues in the xorg-x11-server and xorg-x11-server-Xwayland packages. The affected versions are Red Hat Enterprise Linux 10 versions from 10.0.0 up to but not including 10.2.2. The CVSS v3.1 base score is 7.8, indicating high severity with impacts on confidentiality, integrity, and availability. No known exploits in the wild have been reported at this time.

Detailed information about CVE-2026-50261: Use After Free in Red Hat Red Hat Enterprise Linux 10 affecting Red Hat Red Hat Enterprise Linux 10. Get real-time up

CVE-2026-50261: Use After Free in Red Hat Red Hat Enterprise Linux 10 - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2026-50261: Use After Free in Red Hat Red Hat Enterprise Linux 10

A stack-based buffer overflow flaw was found in the X.Org X server and Xwayland. A mismatch between the X server and the libXfont2 library's maximum font name length can cause a stack buffer overflow during font alias resolution. The server allocates a 256 byte stack buffer but libXfont2's alias target name length is 1024 bytes. A font alias name between 257 and 1023 bytes causes the X server to copy that name into the undersized stack buffer without further checks. This may be used to crash the server, or for privilege escalation if the X server runs as root.

This advisory covers multiple security flaws in the xorg-x11-server-Xwayland component, part of the TigerVNC suite and Red Hat Enterprise Linux distributions. The vulnerabilities include stack buffer overflows caused by unchecked input lengths and indexing, use-after-free bugs in several functions, and out-of-bounds read/write conditions. These issues could lead to memory corruption and potential information disclosure. Red Hat has released updates for affected versions to remediate these vulnerabilities.

Detailed information about Red Hat Security Advisory: xorg-x11-server-Xwayland security, bug fix, and enhancement update affecting Red Hat Product Security Red 

Red Hat Security Advisory: xorg-x11-server-Xwayland security, bug fix, and enhancement update - Live Threat Intelligence - Threat Radar | OffSeq.com

https://access.redhat.com/errata/RHSA-2026:26562

https://access.redhat.com/security/updates/classification/#important

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Canonical URL

https://access.redhat.com/errata/RHSA-2026:49519

CVE-2026-50256: Stack-based Buffer Overflow in Red Hat Red Hat Enterprise Linux 10


CVE-2026-50261: Use After Free in Red Hat Red Hat Enterprise Linux 10CVE-2026-50261 0 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. HighVulnerability#cve #cve-2026-50261 #gcve Join the discussion	CVE Database V5	06/24/2026, 05:00:00 UTC Added: 06/05/2026, 11:48:43 UTC
CVE-2026-50256: Stack-based Buffer Overflow in Red Hat Red Hat Enterprise Linux 10CVE-2026-50256 0 A stack-based buffer overflow flaw was found in the X.Org X server and Xwayland. A mismatch between the X server and the libXfont2 library's maximum font name length can cause a stack buffer overflow during font alias resolution. The server allocates a 256 byte stack buffer but libXfont2's alias target name length is 1024 bytes. A font alias name between 257 and 1023 bytes causes the X server to copy that name into the undersized stack buffer without further checks. This may be used to crash the server, or for privilege escalation if the X server runs as root. HighVulnerability#gcve #csaf #cve-2026-50256 Join the discussion	GCVE Database	06/05/2026, 10:31:22 UTC Added: 06/17/2026, 16:44:36 UTC

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