PT-2026-48241 · Xen · Xen

Jan Beulich · CVE-2026-42487 · Published 2026-06-09 · Updated 2026-06-29

Positive Technologies (AI Summary)

CVSS v3.1

7.9

High

Base vector

AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:H

Name of the Vulnerable Software and Affected Versions Xen (affected versions not specified)

Description HVM guest I/O port accesses require either emulation or translation. These translations are managed by the device model through 'XEN DOMCTL ioport mapping'. The linked list used for these translations can change at any time, but the traversal of these lists during guest I/O port access handling lacked the necessary synchronization with updates.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Race Condition

Weakness Enumeration

CWE-362

Related Identifiers

CVE-2026-42487

SUSE-SU-2026:2328-1

SUSE-SU-2026:2329-1

SUSE-SU-2026:2364-1

SUSE-SU-2026:2613-1

SUSE-SU-2026:2668-1

Affected Products

Xen

References · 34

• https://osv.dev/vulnerability/ALPINE-CVE-2026-42487 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2026-42487 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2026:2668-1 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-42487 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-42487 · Security Note
• https://osv.dev/vulnerability/SUSE-SU-2026:2328-1 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-42487 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2026:2613-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-42487 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2026:2364-1 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-42487 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2026:2329-1 · Vendor Advisory
• https://suse.com/support/update/announcement/2026/suse-su-20262364-1 · Note
• https://xenbits.xenproject.org/xsa/advisory-491.html · Note
• https://suse.com/security/cve/CVE-2026-42487 · Note