CVE-2026-56000

UNKNOWN 0.0

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

CVSS Score

0.0

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-416
Vendor	x.org
Product	xorg-x11-server
Published	Jul 8, 2026
Last Updated	Jul 8, 2026

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Affected Versions

X.Org / xorg-x11-server

0 < 21.1.24

X.Org / xwayland

0 < 24.1.13

References

NVD ↗ CVE.org ↗ EPSS Data ↗

gitlab.freedesktop.org: https://gitlab.freedesktop.org/xorg/xserver/-/commit/2779affbdb4354e894f490e56f962527d6125043 openwall.com: https://www.openwall.com/lists/oss-security/2026/07/08/2

Credits

Anonymous working with Trend Micro Zero Day Initiative.