Vulnerability · Published Sep 8, 2026 · Assigned by XEN
CVE-2026-79602x86: improper handling of HVM emulation return codes
High 8.8
In plain English
A high-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). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)8.8High
Exploit odds (30 days)0.1%top 97.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
A guest with a PCI device assigned that has at least a BAR on the IO port space can trigger a BUG() in Xen.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.21 | xen | 4.19.6-r1 | ALPINE-CVE-2026-79602 |
| Alpine:v3.22 | xen | 4.20.4-r1 | ALPINE-CVE-2026-79602 |
| Alpine:v3.23 | xen | 4.20.4-r1 | ALPINE-CVE-2026-79602 |
| Alpine:v3.24 | xen | 4.21.2-r1 | ALPINE-CVE-2026-79602 |
| Debian:12 | xen | 4.17.7+13-g2445b30a44-0+deb12u1 | DEBIAN-CVE-2026-79602 |
| Debian:13 | xen | 4.20.4+39-gf1e1321c87-0+deb13u1 | DEBIAN-CVE-2026-79602 |
| Debian:14 | xen | 4.20.4+39-gf1e1321c87-1 | DEBIAN-CVE-2026-79602 |
| Ubuntu:22.04:LTS | xen | no fix listed | UBUNTU-CVE-2026-79602 |
| Ubuntu:24.04:LTS | xen | no fix listed | UBUNTU-CVE-2026-79602 |
| Ubuntu:26.04:LTS | xen | no fix listed | UBUNTU-CVE-2026-79602 |
| Ubuntu:26.10 | xen | no fix listed | UBUNTU-CVE-2026-79602 |
Affected products (as reported)
Weakness: CWE-119 · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H