CVE-2026-42490— domctl lock open to abuse
Possible ATT&CK Techniques 1AI
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I. Basic Information for CVE-2026-42490
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
II. Public POCs for CVE-2026-42490
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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
V. Comments for CVE-2026-42490
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