References to Advisories, Solutions, and Tools

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Change History

AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CWE-667

{"timestamp":"2026-06-18T15:04:47.308725Z","id":"CVE-2026-42490","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}

[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.

https://xenbits.xenproject.org/xsa/advisory-492.html

[{"vendor":"Xen","product":"Xen","defaultStatus":"unknown","versions":[{"version":"consult Xen advisory XSA-492","status":"unknown"}]}]