Vulnerability · Published Oct 13, 2026 · Assigned by XEN
CVE-2026-79607Xenstore: Guests can crash xenstored during Live Update
Medium 5.5
In plain English
A medium-severity memory corruption in Xen from Xen. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 2% of all known vulnerabilities).
Severity (CVSS 3.1)5.5Medium
Exploit odds (30 days)0.1%top 97.9% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | xen | no fix listed | DEBIAN-CVE-2026-79607 |
| Debian:13 | xen | no fix listed | DEBIAN-CVE-2026-79607 |
| Debian:14 | xen | no fix listed | DEBIAN-CVE-2026-79607 |
| Ubuntu:22.04:LTS | xen | no fix listed | UBUNTU-CVE-2026-79607 |
| Ubuntu:24.04:LTS | xen | no fix listed | UBUNTU-CVE-2026-79607 |
| Ubuntu:26.04:LTS | xen | no fix listed | UBUNTU-CVE-2026-79607 |
| Ubuntu:26.10 | xen | no fix listed | UBUNTU-CVE-2026-79607 |
Affected products (as reported)
Weakness: CWE-119 · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H