🛡️ CVE-2026-42488

🟠 CVSS 8.1 — High ✅ No Known Exploit CWE-119 NVD

8.1

CVSS Score

0 Low4 Medium7 High9 Critical10

Description

Some shadow paging errors paths will switch the page-tables without

updating the currently running vCPU reference. This causes a mismatch

between the loaded page-tables and the mapcache metadata which can lead

to corruption of the mapcache.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is high, 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 high, integrity high, availability high.

Weakness class

CVE-2026-42488 is classified as CWE-119: Improper Restriction of Operations within Memory Buffer Bounds. A read or write is performed without confirming it stays inside the allocated buffer, corrupting adjacent memory.

Affected software

CVE-2026-42488 is recorded against 1 package.

unknown

Timeline and source

Published on 18 June 2026 and last revised on 22 June 2026. No public exploit is currently recorded for this entry. Record sourced from NVD.

References

xenbits.xenproject.org
www.openwall.com
xenbits.xen.org

CVE-2026-42488 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Debian Ubuntu

Details

Severity HIGH

CVSS Score 8.1

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

CWE CWE-119

Public Exploit ✅ No

Source NVD

Published 2026-06-18

Updated 2026-08-11

Modified 2026-06-22

Fix URL N/A

Affected Packages

Software	From version	Fixed in
unknown	—	—

References

https://xenbits.xenproject.org/xsa/advisory-494.html

http://www.openwall.com/lists/oss-security/2026/06/09/14

http://xenbits.xen.org/xsa/advisory-494.html

🔗 NVD 🔗 Mitre

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