CVE-2026-93517— X.Org Server GLX RenderLarge Heap Buffer Overflow

Quick assessment

Affected

x.orgg xorg-x11-server

Exploitation

No confirmed in-the-wild exploitation; assess based on exposure

Recommended action

Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 X.org X Server 21.1.25 之前版本以及 XWayland 24.1.14 之前版本中，处理 GLX RenderLarge 请求时存在堆缓冲区溢出漏洞。当数据字节数（dataBytes）超过命令长度（cmdlen）时，该漏洞可被已认证的 X 客户端触发，可能导致 X Server 进程崩溃或在 X Server 上下文中执行任意代码。

CVSS 8.5 · High Updated Oct 28, 2026

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

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Vulnerability Information

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Vulnerability Title

X.Org Server GLX RenderLarge Heap Buffer Overflow

Source: CVE Program / CVE List V5

Vulnerability Description

A heap buffer overflow in handling GLX RenderLarge request where dataBytes exceeds cmdlen in X.org X server before 21.1.25 and XWayland before 24.1.14 that could be be triggered by an authenticated X client could cause crashes or code execution in X server context.

Source: CVE Program / CVE List V5

CVSS Information

CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Source: CVE Program / CVE List V5

Vulnerability Type

堆缓冲区溢出

Source: CVE Program / CVE List V5

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
x.orgg	xorg-x11-server	0 ~ 21.1.25	-
x.org	xwayland	0 ~ 24.1.14	-

II. Public POCs for CVE-2026-93517

#	POC Description	Source Link	Shenlong Link

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No public POC found.

III. Intelligence Information for CVE-2026-93517

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Other References for CVE-2026-93517 (1)

https://gitlab.freedesktop.org/xorg/xserver/-/commit/2abe4632d793314d3d5f28c19583fb76019f5ce4 patch

https://www.cve.org/CVERecord?id=CVE-2026-93517

IV. Related Vulnerabilities

Same product: xorg-x11-server

Same weakness: CWE-122