CVE-2026-56000— xorg-x11-server / xwayland GLX contextTags Use-After-Free in CommonMakeCurrent()
Possible ATT&CK Techniques 1AI
T1203 · Exploitation for Client ExecutionAffected Version Matrix 2
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| X.Org | xorg-x11-server | < 21.1.24 | affected |
| X.Org | xwayland | < 24.1.13 | affected |
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I. Basic Information for CVE-2026-56000
Vulnerability Information
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Vulnerability Title
xorg-x11-server / xwayland GLX contextTags Use-After-Free in CommonMakeCurrent()
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
释放后使用
Source: CVE Program / CVE List V5
Vulnerability Title
xorg xorg-server 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
xorg xorg-server是xorg组织的一款服务器软件与操作系统组件。 xorg xorg-server 21.2.24之前版本存在资源管理错误漏洞，该漏洞源于CommonMakeCurrent()指向可能重新分配的内存，导致堆释放后重用。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| X.Org | xorg-x11-server | 0 ~ 21.1.24 | - | |
| X.Org | xwayland | 0 ~ 24.1.13 | - |
II. Public POCs for CVE-2026-56000
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2026-56000 (1)
Mailing List Discussions for CVE-2026-56000 (1)
Same Patch Batch · X.Org · 2026-07-08 · 5 CVEs total
| CVE-2026-55999 | 8.5 HIGH | xorg-server / xwayland glamor font atlas Heap Buffer Overflow |
| CVE-2026-56001 | 8.5 HIGH | libXfont2 BitmapScaleBitmaps Integer Overflow Heap Buffer Overflow |
| CVE-2026-56002 | 8.5 HIGH | libXfont2 PCF Font Parsing Heap Buffer Overflow |
| CVE-2026-56003 | 8.5 HIGH | libXfont2 computeProps Property Buffer Heap Buffer Overflow |
IV. Related Vulnerabilities
Same vendor: X.Org
- CVE-2026-56003
libXfont2 computeProps Property Buffer Heap Buffer Overflow - CVE-2026-56002
libXfont2 PCF Font Parsing Heap Buffer Overflow - CVE-2026-56001
libXfont2 BitmapScaleBitmaps Integer Overflow Heap Buffer Ov - CVE-2026-55999
xorg-server / xwayland glamor font atlas Heap Buffer Overflo - CVE-2025-62229
Xorg: xmayland: use-after-free in xpresentnotify structure c
Same weakness: CWE-416
- CVE-2026-12366
Use-after-free freeing an armed dynamically-allocated k_time - CVE-2026-12365
Use-after-free in Zephyr delayable work-queue cancellation u - CVE-2026-11937
Security vulnerabilities have been found in IBM Verify Ident - CVE-2026-19548
Binutils: binutils: multiple use-after-free in add_archive_e - CVE-2026-19560
Google Chrome 资源管理错误漏洞
V. Comments for CVE-2026-56000
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