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CVE-2023-5367

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

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.

CVSS 3.1 · 7.8 High EPSS < 1% KEV · Not listed
Vendors
Debian Fedoraproject Redhat and 1 more
Products
Debian Linux Fedora Enterprise Linux and 14 more
CVE-2026-56000

xorg-x11-server / xwayland GLX contextTags Use-After-Free in CommonMakeCurrent()

Local attackers with a X connection able to provide GLX commit to the X server xorg-server before 21.2.24 and xwayland before 24.1.13 could cause a Heap Use After Free, due to CommonMakeCurrent() pointing into potentially reallocated memory.

CVSS 4.0 · 9 Critical EPSS < 1% KEV · Not listed
Vendors
X.org
Products
X Server Xorg-server Xwayland
CVE-2026-55999

xorg-server / xwayland glamor font atlas Heap Buffer Overflow

Local attackers with a X connection able to provide PCX fonts to the X server xorg-server before 21.2.24 and xwayland before 24.1.13 could cause a heap buffer overflow via SetFont due to missing glyph boundary checks.

CVSS 3.1 · 8.5 High EPSS < 1% KEV · Not listed
Vendors
X.org
Products
X Server Xorg-server Xwayland