CVE-2026-42487
x86 HVM I/O port list traversal
Vexday Risk Score
21Low
SSVC decision (CISA)
Track
No exploitation signal → monitor
CVSS 7.9EPSS 0.1%KEV nãoPoC —Nuclei —Metasploit —Patch —
Lifecycle
18 Jun 2026Published on NVD
Recommendation: Monitor — no exploitation signal at the moment.
HVM guest I/O port accesses are subject to either emulation or at least
translation. Translations are managed by the device model (via
XEN_DOMCTL_ioport_mapping), and hence the linked list used may changed
at any time. Traversal of those lists (while handling guest I/O port
accesses) therefore needs synchronizing with updates, which was missing
so far.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:H
Affected products
Xen · XenWant to know if your infrastructure is exposed to this?
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