domctl lock open to abuse_CVE-2026-42490

6.5 / 10

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

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.

Basic Information

ID CVE-2026-42490

Source XEN

Published Jun 18, 2026 at 13:47

Modified Jun 18, 2026 at 15:04

Affected Product

Vendor Xen

Product Xen

Version consult Xen advisory XSA-492

CWE Classification

CWE-667

References

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

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    "published": "2026-06-18T13:47:13.257Z",
    "modified": "2026-06-18T15:04:50.692Z",
    "type": "cve",
    "title": "domctl lock open to abuse",
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