CVE-2026-50260

CVE.org · Published

Record status: Published
Identifier year (not publication year): 2026
Source publication: Jun 5, 2026
Source updated: Sep 28, 2026
Imported by cveboard: Oct 24, 2026
Source snapshot: cve_2026-10-24_midnight_baseline · Oct 24, 2026

CNA source text (English)

Xorg-x11-server: xorg-x11-server-xwayland: xorg-x11-server: use-after-free in freecounter()

A use-after-free flaw was found in the X.Org X server and Xwayland in FreeCounter(). A client that sets up multiple SyncCounters and awaits on those triggers can trigger a use-after-free when destroying those counters via a second client connection. This may be used to crash the server, or for privilege escalation if the X server runs as root.

Scoped product and version facts

Fix information unknown; no fixed version is derived here. Missing information does not prove that no fix exists.

Exploitation unknown; this catalogue does not assess exploitation.

Red Hat Enterprise Linux 10

Vendor: Red Hat
Product: Red Hat Enterprise Linux 10
Platforms: Unknown
Default status: affected
Package: xorg-x11-server-Xwayland
Package collection: https://access.redhat.com/downloads/content/package-browser/

Red Hat Enterprise Linux 10 · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
0:24.1.9-4.el10_2.2	`unaffected`	rpm	*	Unavailable	None listed

Red Hat Enterprise Linux 10.0 Extended Update Support

Vendor: Red Hat
Product: Red Hat Enterprise Linux 10.0 Extended Update Support
Platforms: Unknown
Default status: affected
Package: xorg-x11-server-Xwayland
Package collection: https://access.redhat.com/downloads/content/package-browser/

Red Hat Enterprise Linux 10.0 Extended Update Support · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
0:24.1.5-6.el10_0.1	`unaffected`	rpm	*	Unavailable	None listed

Red Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSION

Vendor: Red Hat
Product: Red Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSION
Platforms: Unknown
Default status: affected
Package: tigervnc
Package collection: https://access.redhat.com/downloads/content/package-browser/

Red Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSION · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
0:1.1.0-25.el6_10.18	`unaffected`	rpm	*	Unavailable	None listed

Red Hat Enterprise Linux 7 Extended Lifecycle Support

Vendor: Red Hat
Product: Red Hat Enterprise Linux 7 Extended Lifecycle Support
Platforms: Unknown
Default status: affected
Package: xorg-x11-server
Package collection: https://access.redhat.com/downloads/content/package-browser/

Red Hat Enterprise Linux 7 Extended Lifecycle Support · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
0:1.20.4-35.el7_9	`unaffected`	rpm	*	Unavailable	None listed

Red Hat Enterprise Linux 7 Extended Lifecycle Support

Vendor: Red Hat
Product: Red Hat Enterprise Linux 7 Extended Lifecycle Support
Platforms: Unknown
Default status: affected
Package: tigervnc
Package collection: https://access.redhat.com/downloads/content/package-browser/

Red Hat Enterprise Linux 7 Extended Lifecycle Support · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
0:1.8.0-36.el7_9.5	`unaffected`	rpm	*	Unavailable	None listed

Red Hat Enterprise Linux 8

Vendor: Red Hat
Product: Red Hat Enterprise Linux 8
Platforms: Unknown
Default status: affected
Package: xorg-x11-server-Xwayland
Package collection: https://access.redhat.com/downloads/content/package-browser/

Red Hat Enterprise Linux 8 · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
0:21.1.3-20.el8_10.2	`unaffected`	rpm	*	Unavailable	None listed

Red Hat Enterprise Linux 8

Vendor: Red Hat
Product: Red Hat Enterprise Linux 8
Platforms: Unknown
Default status: affected
Package: xorg-x11-server
Package collection: https://access.redhat.com/downloads/content/package-browser/

Red Hat Enterprise Linux 8 · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
0:1.20.11-28.el8_10.2	`unaffected`	rpm	*	Unavailable	None listed

Red Hat Enterprise Linux 8

Vendor: Red Hat
Product: Red Hat Enterprise Linux 8
Platforms: Unknown
Default status: affected
Package: tigervnc
Package collection: https://access.redhat.com/downloads/content/package-browser/

Red Hat Enterprise Linux 8 · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
0:1.15.0-10.el8_10	`unaffected`	rpm	*	Unavailable	None listed

Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support

Vendor: Red Hat
Product: Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
Platforms: Unknown
Default status: affected
Package: xorg-x11-server
Package collection: https://access.redhat.com/downloads/content/package-browser/

Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
0:1.20.10-5.el8_4	`unaffected`	rpm	*	Unavailable	None listed

Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support

Vendor: Red Hat
Product: Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
Platforms: Unknown
Default status: affected
Package: tigervnc
Package collection: https://access.redhat.com/downloads/content/package-browser/

Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
0:1.11.0-8.el8_4.16	`unaffected`	rpm	*	Unavailable	None listed

Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On

Vendor: Red Hat
Product: Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On
Platforms: Unknown
Default status: affected
Package: xorg-x11-server
Package collection: https://access.redhat.com/downloads/content/package-browser/

Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
0:1.20.10-5.el8_4	`unaffected`	rpm	*	Unavailable	None listed

Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On

Vendor: Red Hat
Product: Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On
Platforms: Unknown
Default status: affected
Package: tigervnc
Package collection: https://access.redhat.com/downloads/content/package-browser/

Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
0:1.11.0-8.el8_4.16	`unaffected`	rpm	*	Unavailable	None listed

Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support

Vendor: Red Hat
Product: Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
Platforms: Unknown
Default status: affected
Package: xorg-x11-server
Package collection: https://access.redhat.com/downloads/content/package-browser/

Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
0:1.20.11-8.el8_6	`unaffected`	rpm	*	Unavailable	None listed

Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support

Vendor: Red Hat
Product: Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
Platforms: Unknown
Default status: affected
Package: xorg-x11-server-Xwayland
Package collection: https://access.redhat.com/downloads/content/package-browser/

Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
0:21.1.3-2.el8_6.7	`unaffected`	rpm	*	Unavailable	None listed

Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support

Vendor: Red Hat
Product: Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
Platforms: Unknown
Default status: affected
Package: tigervnc
Package collection: https://access.redhat.com/downloads/content/package-browser/

Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
0:1.12.0-6.el8_6.18	`unaffected`	rpm	*	Unavailable	None listed

Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On

Vendor: Red Hat
Product: Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On
Platforms: Unknown
Default status: affected
Package: xorg-x11-server
Package collection: https://access.redhat.com/downloads/content/package-browser/

Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
0:1.20.11-8.el8_6	`unaffected`	rpm	*	Unavailable	None listed

Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On

Vendor: Red Hat
Product: Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On
Platforms: Unknown
Default status: affected
Package: xorg-x11-server-Xwayland
Package collection: https://access.redhat.com/downloads/content/package-browser/

Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
0:21.1.3-2.el8_6.7	`unaffected`	rpm	*	Unavailable	None listed

Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On

Vendor: Red Hat
Product: Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On
Platforms: Unknown
Default status: affected
Package: tigervnc
Package collection: https://access.redhat.com/downloads/content/package-browser/

Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
0:1.12.0-6.el8_6.18	`unaffected`	rpm	*	Unavailable	None listed

Red Hat Enterprise Linux 8.8 Telecommunications Update Service

Vendor: Red Hat
Product: Red Hat Enterprise Linux 8.8 Telecommunications Update Service
Platforms: Unknown
Default status: affected
Package: xorg-x11-server
Package collection: https://access.redhat.com/downloads/content/package-browser/

Red Hat Enterprise Linux 8.8 Telecommunications Update Service · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
0:1.20.11-19.el8_8	`unaffected`	rpm	*	Unavailable	None listed

Red Hat Enterprise Linux 8.8 Telecommunications Update Service

Vendor: Red Hat
Product: Red Hat Enterprise Linux 8.8 Telecommunications Update Service
Platforms: Unknown
Default status: affected
Package: xorg-x11-server-Xwayland
Package collection: https://access.redhat.com/downloads/content/package-browser/

Red Hat Enterprise Linux 8.8 Telecommunications Update Service · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
0:21.1.3-13.el8_8.1	`unaffected`	rpm	*	Unavailable	None listed

Red Hat Enterprise Linux 8.8 Telecommunications Update Service

Vendor: Red Hat
Product: Red Hat Enterprise Linux 8.8 Telecommunications Update Service
Platforms: Unknown
Default status: affected
Package: tigervnc
Package collection: https://access.redhat.com/downloads/content/package-browser/

Red Hat Enterprise Linux 8.8 Telecommunications Update Service · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
0:1.12.0-15.el8_8.18	`unaffected`	rpm	*	Unavailable	None listed

Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions

Vendor: Red Hat
Product: Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
Platforms: Unknown
Default status: affected
Package: xorg-x11-server
Package collection: https://access.redhat.com/downloads/content/package-browser/

Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
0:1.20.11-19.el8_8	`unaffected`	rpm	*	Unavailable	None listed

Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions

Vendor: Red Hat
Product: Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
Platforms: Unknown
Default status: affected
Package: xorg-x11-server-Xwayland
Package collection: https://access.redhat.com/downloads/content/package-browser/

Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
0:21.1.3-13.el8_8.1	`unaffected`	rpm	*	Unavailable	None listed

Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions

Vendor: Red Hat
Product: Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
Platforms: Unknown
Default status: affected
Package: tigervnc
Package collection: https://access.redhat.com/downloads/content/package-browser/

Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
0:1.12.0-15.el8_8.18	`unaffected`	rpm	*	Unavailable	None listed

Red Hat Enterprise Linux 9

Vendor: Red Hat
Product: Red Hat Enterprise Linux 9
Platforms: Unknown
Default status: affected
Package: xorg-x11-server-Xwayland
Package collection: https://access.redhat.com/downloads/content/package-browser/

Red Hat Enterprise Linux 9 · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
0:24.1.9-4.el9_8.2	`unaffected`	rpm	*	Unavailable	None listed

Red Hat Enterprise Linux 9

Vendor: Red Hat
Product: Red Hat Enterprise Linux 9
Platforms: Unknown
Default status: affected
Package: xorg-x11-server
Package collection: https://access.redhat.com/downloads/content/package-browser/

Red Hat Enterprise Linux 9 · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
0:1.20.11-34.el9_8.2	`unaffected`	rpm	*	Unavailable	None listed

Red Hat Enterprise Linux 9

Vendor: Red Hat
Product: Red Hat Enterprise Linux 9
Platforms: Unknown
Default status: affected
Package: tigervnc
Package collection: https://access.redhat.com/downloads/content/package-browser/

Red Hat Enterprise Linux 9 · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
0:1.15.0-7.el9_8.2	`unaffected`	rpm	*	Unavailable	None listed

Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

Vendor: Red Hat
Product: Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions
Platforms: Unknown
Default status: affected
Package: xorg-x11-server
Package collection: https://access.redhat.com/downloads/content/package-browser/

Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
0:1.20.11-21.el9_2	`unaffected`	rpm	*	Unavailable	None listed

Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

Vendor: Red Hat
Product: Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions
Platforms: Unknown
Default status: affected
Package: xorg-x11-server-Xwayland
Package collection: https://access.redhat.com/downloads/content/package-browser/

Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
0:21.1.3-10.el9_2.1	`unaffected`	rpm	*	Unavailable	None listed

Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

Vendor: Red Hat
Product: Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions
Platforms: Unknown
Default status: affected
Package: tigervnc
Package collection: https://access.redhat.com/downloads/content/package-browser/

Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
0:1.12.0-14.el9_2.15	`unaffected`	rpm	*	Unavailable	None listed

Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions

Vendor: Red Hat
Product: Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions
Platforms: Unknown
Default status: affected
Package: xorg-x11-server
Package collection: https://access.redhat.com/downloads/content/package-browser/

Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
0:1.20.11-29.el9_4	`unaffected`	rpm	*	Unavailable	None listed

Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions

Vendor: Red Hat
Product: Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions
Platforms: Unknown
Default status: affected
Package: xorg-x11-server-Xwayland
Package collection: https://access.redhat.com/downloads/content/package-browser/

Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
0:22.1.9-8.el9_4.1	`unaffected`	rpm	*	Unavailable	None listed

Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions

Vendor: Red Hat
Product: Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions
Platforms: Unknown
Default status: affected
Package: tigervnc
Package collection: https://access.redhat.com/downloads/content/package-browser/

Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
0:1.13.1-8.el9_4.10	`unaffected`	rpm	*	Unavailable	None listed

Red Hat Enterprise Linux 9.6 Extended Update Support

Vendor: Red Hat
Product: Red Hat Enterprise Linux 9.6 Extended Update Support
Platforms: Unknown
Default status: affected
Package: xorg-x11-server
Package collection: https://access.redhat.com/downloads/content/package-browser/

Red Hat Enterprise Linux 9.6 Extended Update Support · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
0:1.20.11-34.el9_6	`unaffected`	rpm	*	Unavailable	None listed

Red Hat Enterprise Linux 9.6 Extended Update Support

Vendor: Red Hat
Product: Red Hat Enterprise Linux 9.6 Extended Update Support
Platforms: Unknown
Default status: affected
Package: xorg-x11-server-Xwayland
Package collection: https://access.redhat.com/downloads/content/package-browser/

Red Hat Enterprise Linux 9.6 Extended Update Support · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
0:23.2.7-6.el9_6.1	`unaffected`	rpm	*	Unavailable	None listed

Red Hat Enterprise Linux 9.6 Extended Update Support

Vendor: Red Hat
Product: Red Hat Enterprise Linux 9.6 Extended Update Support
Platforms: Unknown
Default status: affected
Package: tigervnc
Package collection: https://access.redhat.com/downloads/content/package-browser/

Red Hat Enterprise Linux 9.6 Extended Update Support · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
0:1.14.1-11.el9_6	`unaffected`	rpm	*	Unavailable	None listed

Red Hat Enterprise Linux 6

Vendor: Red Hat
Product: Red Hat Enterprise Linux 6
Platforms: Unknown
Default status: unknown
Package: xorg-x11-server
Package collection: https://access.redhat.com/downloads/content/package-browser/

No explicit version tuples; consult this entry's default status.