Encoding Error in Xen - CVE-2026-79607
Published: October 13, 2026
Vulnerability identifier: #VU154200
CSH Severity: Low
CVSS v4: 5.8 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-79607
CWE-ID: CWE-172
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to corrupt Xenstore data or cause a denial of service affecting host domain administration.
The vulnerability exists due to incomplete serialization of watch state records in Xenstore when transferring state during a live update. A local user can create a Xenstore watch with a specified watch depth from an unprivileged guest to corrupt Xenstore data or cause a denial of service affecting host domain administration.
Exploitation requires the C implementation of Xenstore to run as a daemon or stub domain.
Affected software
Xen
How to mitigate CVE-2026-79607
Install security update from vendor's website.