CVE-2026-34001: Expired Pointer Dereference in Red Hat Red Hat Enterprise Linux 10
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.
AI Analysis
Technical Summary
This vulnerability is a use-after-free flaw in the X.Org X server, specifically within the XSYNC fence triggering logic implemented in the miSyncTriggerFence() function. It allows an attacker with access to the X11 server to trigger a server crash and potentially cause memory corruption without requiring user interaction. The vulnerability is tracked as CVE-2026-34001 and affects Red Hat Enterprise Linux 10 versions before 10.2. Red Hat has released security updates for the xorg-x11-server-Xwayland package to fix this issue, as documented in their official advisories RHSA-2026:10739 and RHSA-2026:11352.
Potential Impact
Exploitation of this vulnerability can cause the X.Org X server to crash, resulting in denial of service. Additionally, the use-after-free condition may lead to memory corruption, which could be leveraged for further compromise of the affected system. The CVSS v3.1 base score is 7.8 (High), reflecting the potential for high impact on confidentiality, integrity, and availability. No known exploits in the wild have been reported at this time.
Mitigation Recommendations
Red Hat has released official security updates addressing CVE-2026-34001 in the xorg-x11-server-Xwayland package for Red Hat Enterprise Linux 10. Users should apply these updates promptly to remediate the vulnerability. Detailed update instructions are available in Red Hat's advisory and knowledge base article (https://access.redhat.com/articles/11258). Since this is not a cloud service, remediation requires applying the vendor-provided patches. Patch status is confirmed by Red Hat advisories RHSA-2026:10739 and RHSA-2026:11352.
CVE-2026-34001: Expired Pointer Dereference in Red Hat Red Hat Enterprise Linux 10
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.
CVSS v3.1
Score 7.8high
Affected software
pkg:rpm/redhat/xorg-x11-server-XwaylandRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability is a use-after-free flaw in the X.Org X server, specifically within the XSYNC fence triggering logic implemented in the miSyncTriggerFence() function. It allows an attacker with access to the X11 server to trigger a server crash and potentially cause memory corruption without requiring user interaction. The vulnerability is tracked as CVE-2026-34001 and affects Red Hat Enterprise Linux 10 versions before 10.2. Red Hat has released security updates for the xorg-x11-server-Xwayland package to fix this issue, as documented in their official advisories RHSA-2026:10739 and RHSA-2026:11352.
Potential Impact
Exploitation of this vulnerability can cause the X.Org X server to crash, resulting in denial of service. Additionally, the use-after-free condition may lead to memory corruption, which could be leveraged for further compromise of the affected system. The CVSS v3.1 base score is 7.8 (High), reflecting the potential for high impact on confidentiality, integrity, and availability. No known exploits in the wild have been reported at this time.
Mitigation Recommendations
Red Hat has released official security updates addressing CVE-2026-34001 in the xorg-x11-server-Xwayland package for Red Hat Enterprise Linux 10. Users should apply these updates promptly to remediate the vulnerability. Detailed update instructions are available in Red Hat's advisory and knowledge base article (https://access.redhat.com/articles/11258). Since this is not a cloud service, remediation requires applying the vendor-provided patches. Patch status is confirmed by Red Hat advisories RHSA-2026:10739 and RHSA-2026:11352.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- redhat
- Date Reserved
- 2026-03-25T04:53:13.615Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
- Vendor Advisory Urls
- [{"url":"https://access.redhat.com/security/cve/CVE-2026-34001","vendor":"Red Hat"}]
Threat ID: 69ea9e7887115cfb686fc3ff
Added to database: 04/23/2026, 22:34:32 UTC
Last enriched: 07/15/2026, 09:01:29 UTC
Last updated: 07/31/2026, 19:22:58 UTC
Views: 101
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