VULNERABILITY INTELLIGENCE
CVE-2026-34001
CVSS score7.8 HIGH
EPSS probability0.26%
CISA KEVNot currently listed
Published2026-04-23
Last modified2026-10-26
CVSS vectorCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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.
Weakness classification
- secalert@redhat.com: CWE-825
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c: CWE-825