🛡️ CVE-2026-42492 on Debian — xen

⚪ Unknown ✅ No Known Exploit OSV

N/A

CVSS Score

0 Low4 Medium7 High9 Critical10

Description

Xenstore, to have an up-to-date picture of the entire system, wants to know of domains appearing and disappearing. To make this more robust, a new XEN_DOMCTL_get_domain_state was introduced. The management of the bitmap underlying that operation is tied into the binding of the VIRQ_DOM_EXC virtual IRQ. Unfortunately an error path there would tear down the bitmap even in cases when it wasn't set up. Unprivileged domains can trigger that error path.

Distribution advisory

This page covers CVE-2026-42492 as tracked by Debian, for the package xen. No fixed version has been recorded for this distribution yet.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity none, availability high.

Weakness class

DEBIAN-CVE-2026-42492 is classified as CWE-459: Incomplete Cleanup. Temporary state is not fully removed after use, leaving data or resources behind.

Affected software

DEBIAN-CVE-2026-42492 is recorded against 1 package.

xen

Timeline and source

Published on 28 July 2026 and last revised on 31 July 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

security-tracker.debian.org (Advisory)

Details

Severity Unknown

CVSS Score N/A

CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CWE N/A

Public Exploit ✅ No

Source OSV

Published 2026-07-28

Updated 2026-08-20

Modified 2026-07-31

Fix URL N/A

Affected Packages

Software	From version	Fixed in
xen	—	—

References

ADVISORY https://security-tracker.debian.org/tracker/CVE-2026-42492

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