AUGUST 28, 2026
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Case File

CVE-2026-42487

HIGH · CVSS 7.9 EPSS 0.10%

Source: NVD + CISA KEV + EPSS (historical backfill) · Published 2026-06-18 · Last synced 2026-08-04

CyberRota Analysis

This is a high severity vulnerability with a CVSS score of 7.9. See the original NVD description below for full technical details.

CVE
CVE-2026-42487
Severity
HIGH
CVSS
7.9
EPSS
0.10%

Original NVD Description

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.