CVE-2026-56000CWE-416

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

Critical · published July 8, 2026

CVSS v4.0
9.0
EPSS
0%
Percentile
22.4
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
9.0 · CRITICAL
Vector
CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
EPSS
0.00308 · 22.4th percentile
Weakness
CWE-416 · Use After Free
Published
2026-07-08T07:36Z
EPSS history
Timeline
  • 08 JUL 07:36Z
    xorg-x11-server / xwayland GLX contextTags Use-After-Free in CommonMakeCurrent()
    cvelistv5