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CVE-2026-42489

MEDIUM
5.3
CVSS 3.1
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.

Metadata

CVE ID
CVE-2026-42489
State
PUBLISHED
Assigner
XEN
Reserved
2026-04-27 14:20 UTC
Published
2026-06-18 13:47 UTC
Last updated
2026-06-18 15:04 UTC
Primary CWE
CWE-667
CWE-667 Improper Locking
Vendor / Product
Xen / Xen
Sources
cve.org  ·  NVD

Severity & Metrics

5.3 MEDIUM CVSS 3.1
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:N/I:N/A:H
SSVC — CISA Coordinator
Exploitation
none
Automatable
no
Tech. Impact
partial
Affected products (1)
VendorProductPlatformVersions
Xen Xen — consult Xen advisory XSA-492
Weakness (CWE)
CWESourceDescription
CWE-667 adp CWE-667 Improper Locking
CVSS scores (1)
ScoreSeverityVersionSourceVector
5.3 MEDIUM 3.1 adp CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:N/I:N/A:H
References (1)
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