CVE-2026-34001
HIGHCVSS 7.8/10EPSS 0.26%
Last modified
CVE-2026-34001 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. 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. EPSS estimates a 0.26% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
Source: CNA advisory (CVE.org). NVD analysis pending.
| Vendor | Product | Versions |
|---|---|---|
| Red Hat | Red Hat Enterprise Linux 10 | All versions |
| Red Hat | Red Hat Enterprise Linux 10.0 Extended Update Support | All versions |
| Red Hat | Red Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSION | All versions |
| Red Hat | Red Hat Enterprise Linux 7 Extended Lifecycle Support | All versions |
| Red Hat | Red Hat Enterprise Linux 8 | All versions |
| Red Hat | Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support | All versions |
| Red Hat | Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On | All versions |
| Red Hat | Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support | All versions |
| Red Hat | Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On | All versions |
| Red Hat | Red Hat Enterprise Linux 8.6 Telecommunications Update Service | All versions |
| Red Hat | Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions | All versions |
| Red Hat | Red Hat Enterprise Linux 8.8 Telecommunications Update Service | All versions |
| Red Hat | Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions | All versions |
| Red Hat | Red Hat Enterprise Linux 9 | All versions |
| Red Hat | Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions | All versions |
| Red Hat | Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions | All versions |
| Red Hat | Red Hat Enterprise Linux 9.4 Extended Update Support | All versions |
| Red Hat | Red Hat Enterprise Linux 9.6 Extended Update Support | All versions |
| Red Hat | Red Hat Enterprise Linux 6 | All versions |
References
Timeline
- Published
- Last Modified
- Status
- Awaiting Analysis
Frequently Asked Questions
What is CVE-2026-34001?
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.
How severe is CVE-2026-34001?
CVE-2026-34001 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 0.26% probability of exploitation in the next 30 days.
How do I fix CVE-2026-34001?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2026
- CVE-2026-33995FreeRDP is a free implementation of the Remote Desktop Proto…5.3
- CVE-2026-33996LibJWT is a C JSON Web Token Library. Starting in version 3.…5.5
- CVE-2026-33997Moby is an open source container framework. Prior to version…8.1
- CVE-2026-33999A flaw was found in the X.Org X server. This integer underfl…7.8
- CVE-2026-3400A security flaw has been discovered in Tenda AC15 up to 15.1…9.8
- CVE-2026-34000A flaw was found in the X.Org X server. This out-of-bounds r…9.1
- CVE-2026-34002A flaw was found in the X.Org X server. This vulnerability, …9.1
- CVE-2026-34003A flaw was found in the X.Org X server's XKB key types reque…7.8
- CVE-2026-34005In Sofia on Xiongmai DVR/NVR (AHB7008T-MH-V2 and NBD7024H-P)…8.8
- CVE-2026-3401A weakness has been identified in SourceCodester Web-based P…6.6
- CVE-2026-34018An SQL injection vulnerability exists in CubeCart prior to 6…9.8
- CVE-2026-34019When Bidirectional Forwarding Detection (BFD) is configured …6.3
Are you affected by CVE-2026-34001?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST