High severity7.8NVD Advisory· Published Apr 23, 2026· Updated Jun 8, 2026
CVE-2026-34001
CVE-2026-34001
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
41- osv-coords40 versionspkg:rpm/almalinux/tigervncpkg:rpm/almalinux/tigervnc-iconspkg:rpm/almalinux/tigervnc-licensepkg:rpm/almalinux/tigervnc-selinuxpkg:rpm/almalinux/tigervnc-serverpkg:rpm/almalinux/tigervnc-server-minimalpkg:rpm/almalinux/tigervnc-server-modulepkg:rpm/almalinux/xorg-x11-server-commonpkg:rpm/almalinux/xorg-x11-server-develpkg:rpm/almalinux/xorg-x11-server-sourcepkg:rpm/almalinux/xorg-x11-server-Xdmxpkg:rpm/almalinux/xorg-x11-server-Xephyrpkg:rpm/almalinux/xorg-x11-server-Xnestpkg:rpm/almalinux/xorg-x11-server-Xorgpkg:rpm/almalinux/xorg-x11-server-Xvfbpkg:rpm/almalinux/xorg-x11-server-Xwaylandpkg:rpm/almalinux/xorg-x11-server-Xwayland-develpkg:rpm/opensuse/xorg-x11-server&distro=openSUSE%20Leap%2015.6pkg:rpm/opensuse/xorg-x11-server&distro=openSUSE%20Leap%2016.0pkg:rpm/opensuse/xorg-x11-server&distro=openSUSE%20Tumbleweedpkg:rpm/opensuse/xwayland&distro=openSUSE%20Leap%2015.6pkg:rpm/opensuse/xwayland&distro=openSUSE%20Leap%2016.0pkg:rpm/opensuse/xwayland&distro=openSUSE%20Tumbleweedpkg:rpm/suse/xorg-x11-server&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP4-ESPOSpkg:rpm/suse/xorg-x11-server&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP4-LTSSpkg:rpm/suse/xorg-x11-server&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP5-ESPOSpkg:rpm/suse/xorg-x11-server&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP5-LTSSpkg:rpm/suse/xorg-x11-server&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP7pkg:rpm/suse/xorg-x11-server&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Development%20Tools%2015%20SP7pkg:rpm/suse/xorg-x11-server&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP5-LTSSpkg:rpm/suse/xorg-x11-server&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP4-LTSSpkg:rpm/suse/xorg-x11-server&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP5-LTSSpkg:rpm/suse/xorg-x11-server&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP6-LTSSpkg:rpm/suse/xorg-x11-server&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP4pkg:rpm/suse/xorg-x11-server&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP5pkg:rpm/suse/xorg-x11-server&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP6pkg:rpm/suse/xorg-x11-server&distro=SUSE%20Linux%20Enterprise%20Server%20LTSS%20Extended%20Security%2012%20SP5pkg:rpm/suse/xwayland&distro=SUSE%20Linux%20Enterprise%20Server%2016.0pkg:rpm/suse/xwayland&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20applications%2016.0pkg:rpm/suse/xwayland&distro=SUSE%20Linux%20Enterprise%20Workstation%20Extension%2015%20SP7
< 1.15.0-6.el9_7.1+ 39 more
- (no CPE)range: < 1.15.0-6.el9_7.1
- (no CPE)range: < 1.15.0-6.el9_7.1
- (no CPE)range: < 1.15.0-6.el9_7.1
- (no CPE)range: < 1.15.0-6.el9_7.1
- (no CPE)range: < 1.15.0-6.el9_7.1
- (no CPE)range: < 1.15.0-6.el9_7.1
- (no CPE)range: < 1.15.0-6.el9_7.1
- (no CPE)range: < 1.20.11-33.el9_7
- (no CPE)range: < 1.20.11-33.el9_7
- (no CPE)range: < 1.20.11-33.el9_7
- (no CPE)range: < 1.20.11-33.el9_7
- (no CPE)range: < 1.20.11-33.el9_7
- (no CPE)range: < 1.20.11-33.el9_7
- (no CPE)range: < 1.20.11-33.el9_7
- (no CPE)range: < 1.20.11-33.el9_7
- (no CPE)range: < 24.1.5-6.el10_1
- (no CPE)range: < 24.1.5-6.el10_1
- (no CPE)range: < 21.1.11-150600.5.25.1
- (no CPE)range: < 21.1.15-160000.4.1
- (no CPE)range: < 21.1.21-5.1
- (no CPE)range: < 24.1.1-150600.5.23.1
- (no CPE)range: < 24.1.6-160000.4.1
- (no CPE)range: < 24.1.9-2.1
- (no CPE)range: < 1.20.3-150400.38.68.1
- (no CPE)range: < 1.20.3-150400.38.68.1
- (no CPE)range: < 21.1.4-150500.7.46.1
- (no CPE)range: < 21.1.4-150500.7.46.1
- (no CPE)range: < 21.1.15-150700.5.16.1
- (no CPE)range: < 21.1.15-150700.5.16.1
- (no CPE)range: < 1.19.6-10.99.1
- (no CPE)range: < 1.20.3-150400.38.68.1
- (no CPE)range: < 21.1.4-150500.7.46.1
- (no CPE)range: < 21.1.11-150600.5.25.1
- (no CPE)range: < 1.20.3-150400.38.68.1
- (no CPE)range: < 21.1.4-150500.7.46.1
- (no CPE)range: < 21.1.11-150600.5.25.1
- (no CPE)range: < 1.19.6-10.99.1
- (no CPE)range: < 24.1.6-160000.4.1
- (no CPE)range: < 24.1.6-160000.4.1
- (no CPE)range: < 24.1.5-150700.3.14.1
Patches
Vulnerability mechanics
References
37- access.redhat.com/errata/RHSA-2026:10739nvd
- access.redhat.com/errata/RHSA-2026:11352nvd
- access.redhat.com/errata/RHSA-2026:11369nvd
- access.redhat.com/errata/RHSA-2026:11388nvd
- access.redhat.com/errata/RHSA-2026:11656nvd
- access.redhat.com/errata/RHSA-2026:11692nvd
- access.redhat.com/errata/RHSA-2026:13414nvd
- access.redhat.com/errata/RHSA-2026:19125nvd
- access.redhat.com/errata/RHSA-2026:19342nvd
- access.redhat.com/errata/RHSA-2026:19343nvd
- access.redhat.com/errata/RHSA-2026:19344nvd
- access.redhat.com/errata/RHSA-2026:20547nvd
- access.redhat.com/errata/RHSA-2026:20555nvd
- access.redhat.com/errata/RHSA-2026:20557nvd
- access.redhat.com/errata/RHSA-2026:20558nvd
- access.redhat.com/errata/RHSA-2026:20560nvd
- access.redhat.com/errata/RHSA-2026:20561nvd
- access.redhat.com/errata/RHSA-2026:20562nvd
- access.redhat.com/errata/RHSA-2026:20563nvd
- access.redhat.com/errata/RHSA-2026:20575nvd
- access.redhat.com/errata/RHSA-2026:20576nvd
- access.redhat.com/errata/RHSA-2026:20590nvd
- access.redhat.com/errata/RHSA-2026:21699nvd
- access.redhat.com/errata/RHSA-2026:21712nvd
- access.redhat.com/errata/RHSA-2026:21715nvd
- access.redhat.com/errata/RHSA-2026:21716nvd
- access.redhat.com/errata/RHSA-2026:21718nvd
- access.redhat.com/errata/RHSA-2026:21741nvd
- access.redhat.com/errata/RHSA-2026:21742nvd
- access.redhat.com/errata/RHSA-2026:22424nvd
- access.redhat.com/errata/RHSA-2026:22456nvd
- access.redhat.com/errata/RHSA-2026:23254nvd
- access.redhat.com/errata/RHSA-2026:23255nvd
- access.redhat.com/errata/RHSA-2026:23496nvd
- access.redhat.com/errata/RHSA-2026:24341nvd
- access.redhat.com/security/cve/CVE-2026-34001nvd
- bugzilla.redhat.com/show_bug.cginvd
News mentions
1- ZDI-26-335: X.Org Server SyncAwaitFence Use-After-Free Privilege Escalation VulnerabilityZero Day Initiative · Jun 9, 2026