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

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2026-42490— domctl lock open to abuse

Quick assessment

Affected
Xen Xen
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.

Xen是Xen组织开源的一款开源的虚拟机监视器产品。该产品能够使不同和不兼容的操作系统运行在同一台计算机上,并支持在运行时进行迁移,保证正常运行并且避免宕机。 Xen存在竞争条件问题漏洞，该漏洞源于系统范围锁的获取方式未提供公平性，且当XSM/Flask启用时，某些操作中锁获取会先于权限检查，可能导致权限低的攻击者通过网络访问造成拒绝服务。

AI Predicted 7.5 Difficulty: Theoretical EPSS 0.32% · P22

Possible ATT&CK Techniques 1 AI

T1564 · Hide Artifacts

Affected Version Matrix 1

VendorProduct Version RangeStatus
Xen Xen consult Xen advisory XSA-492 unknown
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-42490

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Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.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
domctl lock open to abuse
Source: CVE Program / CVE List V5
Vulnerability Description
[This CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] To create and manage guests, domctl operations are used by the control domain, a possible Xenstore domain, or by a domain controlling a particular guest. Some of these operations may not be executed in parallel, so a system-wide lock is used. The way that lock is acquired is, however, not providing any fairness. This is CVE-2026-42489. Furthermore, with XSM/Flask in use, the lock acquire will, for some operations, occur ahead of any permission checking. This is CVE-2026-42490.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Xen 竞争条件问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Xen是Xen组织开源的一款开源的虚拟机监视器产品。该产品能够使不同和不兼容的操作系统运行在同一台计算机上,并支持在运行时进行迁移,保证正常运行并且避免宕机。 Xen存在竞争条件问题漏洞，该漏洞源于系统范围锁的获取方式未提供公平性，且当XSM/Flask启用时，某些操作中锁获取会先于权限检查，可能导致权限低的攻击者通过网络访问造成拒绝服务。
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
Xen Xen consult Xen advisory XSA-492 -

II. Public POCs for CVE-2026-42490

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

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-42490

请登录查看更多情报信息。

Vendor Advisories for CVE-2026-42490 (1)

Same Patch Batch · Xen · 2026-06-18 · 4 CVEs total

CVE-2026-42489 domctl lock open to abuse
CVE-2026-42487 x86 HVM I/O port list traversal
CVE-2026-42488 x86: mismatched mapcache metadata

IV. Related Vulnerabilities

Same product: Xen
Same vendor: Xen

V. Comments for CVE-2026-42490

No comments yet

Leave a comment