CVE-2026-56000: X.org: xorg-x11-server: GLX contextTags Use-After-Free in CommonMakeCurrent()

Severity: Critical

CVSS Score: 7.8

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.