CVE-2026-42489
domctl lock open to abuse
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.
INFO
Published Date :
June 18, 2026, 1:47 p.m.
Last Modified :
June 18, 2026, 1:47 p.m.
Remotely Exploit :
No
Source :
XEN
Affected Products
The following products are affected by CVE-2026-42489
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
Solution
- Update Xen to the latest version.
- Apply vendor patches for Xen.
- Review Xen lock acquisition logic.
- Ensure permission checks precede lock acquisition.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
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The following list is the news that have been mention
CVE-2026-42489 vulnerability anywhere in the article.