CVE-2026-42487: high-severity vulnerability in Xen
x86 HVM I/O port list traversal
Published
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7.9epss 0.1%
exploitation probability
0.1%top 99% of all CVEs
observed exploitation
nono source reports it
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 · XenRelated CVEs — Xen
In the same product, most dangerous first.
CVE-2024-31142HIGHx86: Incorrect logic for BTC/SRSO mitigationsEPSS 17.4%CVE-2024-2201MEDIUMCVE-2024-2201EPSS 8.8%CVE-2023-46842MEDIUMx86 HVM hypercalls may trigger Xen bug checkEPSS 8.5%CVE-2024-2193MEDIUMSpeculative Race Condition impacts modern CPU architectures that support speculative execution, also known as GhostRace.EPSS 1.3%CVE-2023-46839MEDIUMpci: phantom functions assigned to incorrect contextsEPSS 0.8%CVE-2025-1713HIGHdeadlock potential with VT-d and legacy PCI device pass-throughEPSS 0.8%