CVE-2026-79607

Xenstore: Guests can crash xenstored during Live Update

State: Published
Severity: 5.5 Medium
Published: Oct 13, 2026
Updated: Oct 16, 2026
Reserved: Aug 25, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	5.5 Medium	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H	CISA-ADP

Weaknesses

CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer

Affected Products

Product	Versions
XenXen	consult Xen advisory XSA-514Unknown

References

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

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