CVE-2026-42489domctl lock open to abuse
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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[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.
- CVSS
- 5.3 MEDIUM (v3.1, CISA ADP)CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:N/I:N/A:H
- Weakness (CWE)
- CWE-667
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- XEN
- NVD analysis
- Deferred
- Record last updated
- Jun 18, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Xen Xen xen:xen (from the name) | consult Xen advisory XSA-492 status unknown | CNA record |
References
- https://xenbits.xenproject.org/xsa/advisory-492.html
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.