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
The vulnerability CVE-2026-34001 affects the X.Org X server component used in Red Hat Enterprise Linux 10 (and also mentioned for RHEL 9). It is a use-after-free flaw in the XSYNC fence triggering logic within the miSyncTriggerFence() function. Exploitation requires access to the X11 server but no user interaction. Successful exploitation can cause a denial of service via server crash and may enable memory corruption, potentially leading to further compromise. Red Hat has released official security updates for the xorg-x11-server-Xwayland package that fix this vulnerability. The updates are available for multiple architectures and Red Hat Enterprise Linux variants, including Extended Update Support and Extended Life Cycle versions. The CVSS v3.1 base score is 7.8, reflecting high severity with high impact on confidentiality, integrity, and availability.
Potential Impact
Exploitation of this vulnerability can lead to a denial of service condition by crashing the X.Org X server. Additionally, it may enable memory corruption, which could be leveraged for further system compromise. The vulnerability requires local or adjacent network access with low privileges and no user interaction. The CVSS score of 7.8 indicates a high severity impact affecting confidentiality, integrity, and availability.
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 and related variants. Users and administrators should apply these updates promptly following Red Hat's guidance at https://access.redhat.com/articles/11258. The vendor advisory confirms the availability of patches and recommends updating to the fixed package versions. No additional mitigation steps are indicated beyond applying the official updates.
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
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability CVE-2026-34001 affects the X.Org X server component used in Red Hat Enterprise Linux 10 (and also mentioned for RHEL 9). It is a use-after-free flaw in the XSYNC fence triggering logic within the miSyncTriggerFence() function. Exploitation requires access to the X11 server but no user interaction. Successful exploitation can cause a denial of service via server crash and may enable memory corruption, potentially leading to further compromise. Red Hat has released official security updates for the xorg-x11-server-Xwayland package that fix this vulnerability. The updates are available for multiple architectures and Red Hat Enterprise Linux variants, including Extended Update Support and Extended Life Cycle versions. The CVSS v3.1 base score is 7.8, reflecting high severity with high impact on confidentiality, integrity, and availability.
Potential Impact
Exploitation of this vulnerability can lead to a denial of service condition by crashing the X.Org X server. Additionally, it may enable memory corruption, which could be leveraged for further system compromise. The vulnerability requires local or adjacent network access with low privileges and no user interaction. The CVSS score of 7.8 indicates a high severity impact affecting confidentiality, integrity, and availability.
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 and related variants. Users and administrators should apply these updates promptly following Red Hat's guidance at https://access.redhat.com/articles/11258. The vendor advisory confirms the availability of patches and recommends updating to the fixed package versions. No additional mitigation steps are indicated beyond applying the official updates.
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: 4/23/2026, 10:34:32 PM
Last enriched: 6/4/2026, 7:54:05 PM
Last updated: 6/8/2026, 2:22:05 AM
Views: 57
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