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CVE-2026-42489— 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domctl操作系统级锁获取不公平，可能导致拒绝服务。

AI Predicted 7.5 Difficulty: Moderate EPSS 0.10% · P1

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 1

VendorProduct Version RangeStatus
Xen Xen consult Xen advisory XSA-492 unknown
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I. Basic Information for CVE-2026-42489

Vulnerability Information
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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domctl操作系统级锁获取不公平，可能导致拒绝服务。
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-2026-42489

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III. Intelligence Information for CVE-2026-42489

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Vendor Advisories for CVE-2026-42489 (1)

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

CVE-2026-42490 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-2026-42489

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