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xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free in miSyncDestroyFence()

🗓️ 17 Jun 2026 18:06:29Reported by RedHatType 
redhat
 redhat🔗 access.redhat.com👁 21 Views

Use-after-free in miSyncDestroyFence may crash X.Org server or enable privilege escalation via fence triggers.

Related
Packages
Refs
ReporterTitlePublishedViews
Family
FreeBSD		xwayland -- Multiple vulnerabilities
1 Jun 202600:00
–freebsd
FreeBSD		xorg-server -- Multiple vulnerabilities
1 Jun 202600:00
–freebsd
ATTACKERKB		CVE-2026-50257
5 Jun 202610:31
–attackerkb
Tenable Nessus		Amazon Linux 2023 : xorg-x11-server-Xwayland, xorg-x11-server-Xwayland-devel (ALAS2023-2026-1789)
8 Jun 202600:00
–nessus
Tenable Nessus		Amazon Linux 2023 : xorg-x11-server-common, xorg-x11-server-devel, xorg-x11-server-source (ALAS2023-2026-1790)
8 Jun 202600:00
–nessus
Tenable Nessus		Amazon Linux 2023 : tigervnc, tigervnc-icons, tigervnc-license (ALAS2023-2026-1892)
22 Jun 202600:00
–nessus
Tenable Nessus		Amazon Linux 2 : xorg-x11-server, --advisory ALAS2-2026-3336 (ALAS-2026-3336)
8 Jun 202600:00
–nessus
Tenable Nessus		Alibaba Cloud Linux 3 : 0166: xorg-x11-server (ALINUX3-SA-2026:0166)
1 Jul 202600:00
–nessus
Tenable Nessus		Alibaba Cloud Linux 3 : 0177: tigervnc (ALINUX3-SA-2026:0177)
1 Jul 202600:00
–nessus
Tenable Nessus		Alibaba Cloud Linux 3 : 0183: xorg-x11-server-Xwayland (ALINUX3-SA-2026:0183)
9 Jul 202600:00
–nessus
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OSOS VersionArchitecturePackagePackage VersionFilename
Red Hat Enterprise Linux8.10aarch64xorg-x11-server-common1.20.11-28.el8_10.2xorg-x11-server-common-1.20.11-28.el8_10.2.aarch64.rpm
Red Hat Enterprise Linux8.10ppc64lexorg-x11-server-common1.20.11-28.el8_10.2xorg-x11-server-common-1.20.11-28.el8_10.2.ppc64le.rpm
Red Hat Enterprise Linux8.10s390xxorg-x11-server-common1.20.11-28.el8_10.2xorg-x11-server-common-1.20.11-28.el8_10.2.s390x.rpm
Red Hat Enterprise Linux8.10x86_64xorg-x11-server-common1.20.11-28.el8_10.2xorg-x11-server-common-1.20.11-28.el8_10.2.x86_64.rpm
Red Hat Enterprise Linux8.10aarch64xorg-x11-server-debuginfo1.20.11-28.el8_10.2xorg-x11-server-debuginfo-1.20.11-28.el8_10.2.aarch64.rpm
Red Hat Enterprise Linux8.10i686xorg-x11-server-debuginfo1.20.11-28.el8_10.2xorg-x11-server-debuginfo-1.20.11-28.el8_10.2.i686.rpm
Red Hat Enterprise Linux8.10ppc64lexorg-x11-server-debuginfo1.20.11-28.el8_10.2xorg-x11-server-debuginfo-1.20.11-28.el8_10.2.ppc64le.rpm
Red Hat Enterprise Linux8.10s390xxorg-x11-server-debuginfo1.20.11-28.el8_10.2xorg-x11-server-debuginfo-1.20.11-28.el8_10.2.s390x.rpm
Red Hat Enterprise Linux8.10x86_64xorg-x11-server-debuginfo1.20.11-28.el8_10.2xorg-x11-server-debuginfo-1.20.11-28.el8_10.2.x86_64.rpm
Red Hat Enterprise Linux8.10aarch64xorg-x11-server-debugsource1.20.11-28.el8_10.2xorg-x11-server-debugsource-1.20.11-28.el8_10.2.aarch64.rpm
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27 Jul 2026 15:09Current
5.3Medium risk
Vulners AI Score5.3
CVSS 3.17.8
EPSS0.00142
SSVC
CWE-416
X.Org serverXwaylanduse after freemiSyncDestroyFencefence triggersprivilege escalation
21