---
cve: "CVE-2026-56000"
severity: "CRITICAL"
cvss: 9.0
epss: "22%"
vendor: "X.org"
kev: false
exploited: false
published: "2026-07-08 09:16:29"
tags: [cve, security, critical]
source: tsecurity.de CVE-Dossier
exported: "2026-09-16T21:32:39+02:00"
---

# CVE-2026-56000

> 9.0 CRITICAL

## Beschreibung

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-Vektor

```
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
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Hoch | good |
| PR Privilegien | Gering | warn |
| UI Interaktion | Keine | bad |

## Patch verfügbar (OSV)

- c5a47fda896aeefbf1d06a73e392a294344f9e1a (Commit)
- 2779affbdb4354e894f490e56f962527d6125043 (Commit)

## Referenzen

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

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-56000) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_