CVE-2026-42490
domctl lock open to abuse
CVSS Score
6.5
EPSS Score
0.0%
EPSS Percentile
0th
[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.
| Vendor | xen |
| Product | xen |
| Published | Jun 18, 2026 |
| Last Updated | Jun 18, 2026 |
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Affected Versions
Xen / Xen
All versions affected References
Credits
This issue was discovered by Andrew Cooper of Citrix.