Description
A flaw was found in the X.Org X server. This use-after-free vulnerability occurs in the XSYNC fence triggering logic, specifically within the miSyncTriggerFence() function. An attacker with access to the X11 server can exploit this without user interaction, leading to a server crash and potentially enabling memory corruption. This could result in a denial of service or further compromise of the system.
Published: 2026-04-23
Score: 7.8 High
EPSS: n/a
KEV: No
Impact: n/a
Action: n/a
AI Analysis

No analysis available yet.

Remediation

Vendor Workaround

To mitigate this issue, restrict access to the X11 server to trusted users and networks. If the X.Org X server is not required, consider disabling or uninstalling it. For environments where the X server is essential, running X applications within a sandboxed environment can help reduce the attack surface.

Tracking

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Advisories

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History

Fri, 24 Apr 2026 00:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

threat_severity

Important


Thu, 23 Apr 2026 18:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Thu, 23 Apr 2026 15:45:00 +0000

Type Values Removed Values Added
Description A flaw was found in the X.Org X server. This use-after-free vulnerability occurs in the XSYNC fence triggering logic, specifically within the miSyncTriggerFence() function. An attacker with access to the X11 server can exploit this without user interaction, leading to a server crash and potentially enabling memory corruption. This could result in a denial of service or further compromise of the system.
Title Xorg: xwayland: x.org x server: use-after-free vulnerability leads to server crash and potential memory corruption
First Time appeared Redhat
Redhat enterprise Linux
Weaknesses CWE-825
CPEs cpe:/o:redhat:enterprise_linux:10
cpe:/o:redhat:enterprise_linux:6
cpe:/o:redhat:enterprise_linux:7
cpe:/o:redhat:enterprise_linux:8
cpe:/o:redhat:enterprise_linux:9
Vendors & Products Redhat
Redhat enterprise Linux
References
Metrics cvssV3_1

{'score': 7.8, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'}


Subscriptions

Redhat Enterprise Linux
cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

Updated: 2026-04-24T03:55:27.598Z

Reserved: 2026-03-25T04:53:13.615Z

Link: CVE-2026-34001

cve-icon Vulnrichment

Updated: 2026-04-23T16:19:27.184Z

cve-icon NVD

Status : Received

Published: 2026-04-23T16:16:24.777

Modified: 2026-04-23T16:16:24.777

Link: CVE-2026-34001

cve-icon Redhat

Severity : Important

Publid Date: 2026-04-23T14:14:42Z

Links: CVE-2026-34001 - Bugzilla

cve-icon OpenCVE Enrichment

No data.

Weaknesses