domctl lock open to abuse (Xen Xen)
At a glance
- Source
- NVD
- EPSS
- EPSS 0.08 % · percentile 0 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- XEN
- NVD status
- Deferred
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.
Weaknesses (CWE)
- CWE-667 — Improper Locking
References
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | MEDIUM 5.3 | CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:N/I:N/A:H | CISA-ADP |
| CVSS 3.1 | MEDIUM 5.3 | CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:N/I:N/A:H | NVD · 134c704f-9b21-4f2e-91b3-4a467353bcc0 (Secondary) |
European references
- ENISA EUVD · EUVD-2026-37889
- GCVE · GCVE-0-2026-42489
CERT-FR advisories
- CERTFR-2026-AVI-0721 — Multiples vulnérabilités dans Xen · cert.ssi.gouv.fr
Affected products
| Product | Versions |
|---|---|
| Xen · Xen | unknown consult Xen advisory XSA-492 |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| CERT-FR (ANSSI) | Licence Ouverte / Etalab 2.0 |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |