CVE-2024-0229: Xorg-x11-server: reattaching to different master device may lead to out-of-bounds memory access

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-02-09 · updated 2026-06-17
Weakness: CWE-787

Description

An out-of-bounds memory access flaw was found in the X.Org server. This issue can be triggered when a device frozen by a sync grab is reattached to a different master device. This issue may lead to an application crash, local privilege escalation (if the server runs with extended privileges), or remote code execution in SSH X11 forwarding environments.

Affected products

Fedoraproject Fedora: 39
Red Hat Enterprise Linux: 7.0, 8.0, 9.0
RedHat Enterprise Linux Aus: 8.2, 8.4
RedHat Enterprise Linux Eus: 8.6, 8.8, 9.0, 9.2
RedHat Enterprise Linux Tus: 8.2, 8.4
RedHat Enterprise Linux Update Services For Sap Solutions: 8.2, 8.4
xorg-x11-server: before 21.1.11 — fixed in 21.1.11
X.Org xwayland: before 23.2.4 — fixed in 23.2.4

How to fix

Upgrade to a fixed version: xorg-x11-server 21.1.11; X.Org xwayland 23.2.4. Check the vendor advisory for mitigations.

References

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