Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2026-93515— .Org Server Present Extension Use-After-Free

Quick assessment

Affected
X.org 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 X Wayland 24.1.14 之前版本中， 函数存在一个释放后使用（use-after-free）漏洞。该漏洞可被恶意的 X 客户端利用，导致 X 服务器崩溃，甚至可能在 X 服务器上下文中执行任意代码。

CVSS 6.8 · Medium EPSS 0.19% · P9

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 2

VendorProduct Version RangeStatus
X.org xorg-x11-server < 21.1.25 affected
x.org xwayland < 24.1.14 affected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-93515

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
.Org Server Present Extension Use-After-Free
Source: CVE Program / CVE List V5
Vulnerability Description
A use-after-free in present_clear_window_notifies() in the X.org X Server before 21.1.25 and X Wayland before 24.1.14 could be used by malicious X clients to crash or potentially execute code in the 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:N/VI:N/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
释放后使用
Source: CVE Program / CVE List V5

Affected Products

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

II. Public POCs for CVE-2026-93515

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-93515

请登录查看更多情报信息。

Patches & Fixes for CVE-2026-93515 (1)

Same Patch Batch · X.org · 2026-10-28 · 10 CVEs total

CVE-2026-93518 7.8 HIGH X.Org Server XKB ResizeKeyType Numeric Truncation
CVE-2026-93519 7.8 HIGH X.Org Server XFixes Pointer Barrier Event List Buffer Overflow
CVE-2026-93521 7.8 HIGH X.Org Server RandR ChangeProviderProperty Heap Buffer Overflow
CVE-2026-93520 7.8 HIGH X.Org Server XKB ChangeKeycodeRange Heap Out-of-Bounds Write
CVE-2026-93522 7.8 HIGH X.Org Server Glamor CopyArea Heap Buffer Overflow
CVE-2026-93523 7.8 HIGH X.Org Server XInput2 PassiveUngrabDevice Out-of-Bounds Write
CVE-2026-93524 6.9 MEDIUM X.Org Server XKB SetMap Key Width/Action Count Desync Out-Of-Bounds Read
CVE-2026-93516 5.5 MEDIUM .Org Server XInput Passive Grab Use-After-Free
CVE-2026-93536 5.3 MEDIUM X.Org Server GestureBuildSprite Use-After-Free

IV. Related Vulnerabilities

Same product: xorg-x11-server
Same vendor: X.org
Same weakness: CWE-416