CVE-2025-62230: Xorg: xwayland: use-after-free in xkb client resource removal

Severity: high (CVSS 7.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-10-30 · updated 2026-07-01
Weakness: CWE-416

Description

A flaw was discovered in the X.Org X server’s X Keyboard (Xkb) extension when handling client resource cleanup. The software frees certain data structures without properly detaching related resources, leading to a use-after-free condition. This can cause memory corruption or a crash when affected clients disconnect.

Affected products

Debian Linux: 11.0
IBM AIX: from 7.2.5 before 7.2.5.12; from 7.3.2 before 7.3.3.3; 7.3.4 — fixed in 7.2.5.12, 7.3.3.3
IBM VIOS: from 4.1.0 before 4.1.1.30; 4.1.2.0 — fixed in 4.1.1.30
Red Hat Enterprise Linux: 8.0, 9.0, 10.0
RedHat Enterprise Linux Aus: 8.2, 8.4, 8.6
RedHat Enterprise Linux Els: 6.0, 7.0
RedHat Enterprise Linux Eus: 8.4, 9.4
RedHat Enterprise Linux Tus: 8.6, 8.8
RedHat Enterprise Linux Update Services For Sap Solutions: 8.6, 8.8, 9.0, 9.2
xorg-x11-server: before 21.1.19 — fixed in 21.1.19
X.Org xwayland: before 24.1.9 — fixed in 24.1.9

How to fix

Upgrade to a fixed version: IBM AIX 7.2.5.12, 7.3.3.3; IBM VIOS 4.1.1.30; xorg-x11-server 21.1.19; X.Org xwayland 24.1.9. Check the vendor advisory for mitigations.

References

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