CVE-2026-79607: Xenstore: Guests can crash xenstored during Live Update

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-10-13 · updated 2026-10-16
Weakness: CWE-119

Description

During Xenstore live update the state record for a Xenstore watch with specified watch depth is written with two bytes missing. This results in an inconsistent state when reading the state back in the new Xenstore, causing a crash of Xenstore or wrong Xenstore data.

References

https://xenbits.xenproject.org/xsa/advisory-514.html
http://www.openwall.com/lists/oss-security/2026/10/13/3
http://xenbits.xen.org/xsa/advisory-514.html

Get alerted when CVE-2026-79607 or the next vulnerability affects your stack