CVE-2023-5367: Xorg-x11-server: out-of-bounds write in xichangedeviceproperty/rrchangeoutputproperty

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-10-25 · updated 2026-06-23
Weakness: CWE-787

Description

A out-of-bounds write flaw was found in the xorg-x11-server. This issue occurs due to an incorrect calculation of a buffer offset when copying data stored in the heap in the XIChangeDeviceProperty function in Xi/xiproperty.c and in RRChangeOutputProperty function in randr/rrproperty.c, allowing for possible escalation of privileges or denial of service.

Affected products

Debian Linux: 11.0, 12.0
Fedoraproject Fedora: 37, 38, 39
Red Hat Enterprise Linux: 7.0, 8.0, 9.0
RedHat Enterprise Linux Desktop: 7.0
RedHat Enterprise Linux For Ibm Z Systems: 7.0_s390x
RedHat Enterprise Linux For Power Big Endian: 7.0_ppc64
RedHat Enterprise Linux For Power Little Endian: 7.0_ppc64le
RedHat Enterprise Linux For Scientific Computing: 7.0
RedHat Enterprise Linux Server: 7.0
RedHat Enterprise Linux Workstation: 7.0
xorg-x11-server: before 21.1.9 — fixed in 21.1.9
X.Org xwayland: before 23.2.2 — fixed in 23.2.2

How to fix

Upgrade to a fixed version: xorg-x11-server 21.1.9; X.Org xwayland 23.2.2. Check the vendor advisory for mitigations.

References

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