Vulnerability · Published Jul 28, 2026 · Assigned by XEN
CVE-2026-62426sysctl and platform-op locks open to abuse
High 8.8
In plain English
A high-severity security flaw 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 0.2% (higher than 13% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
[This CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] To manage the system, sysctl and platform operations are used by the control domain or a possible Xenstore domain. Some of these operations may not be executed in parallel, so a system-wide lock each is used. The way those locks are acquired is, however, not providing any fairness. Furthermore, with XSM/Flask in use, the lock acquire will, for some operations, occur ahead of any permission checking. The sysctl issue is CVE-2026-62426. The platform-op issue is CVE-2026-62427.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.21 | xen | 4.19.6-r0 | ALPINE-CVE-2026-62426 |
| Alpine:v3.22 | xen | 4.20.4-r0 | ALPINE-CVE-2026-62426 |
| Alpine:v3.23 | xen | 4.20.4-r0 | ALPINE-CVE-2026-62426 |
| Alpine:v3.24 | xen | 4.21.2-r0 | ALPINE-CVE-2026-62426 |
| Debian:12 | xen | 4.17.7-0+deb12u1 | DEBIAN-CVE-2026-62426 |
| Debian:13 | xen | 4.20.3+127-gc42374a105-0+deb13u1 | DEBIAN-CVE-2026-62426 |
| Debian:14 | xen | 4.20.3+127-gc42374a105-1 | DEBIAN-CVE-2026-62426 |
| Ubuntu:22.04:LTS | xen | no fix listed | UBUNTU-CVE-2026-62426 |
| Ubuntu:24.04:LTS | xen | no fix listed | UBUNTU-CVE-2026-62426 |
| Ubuntu:26.04:LTS | xen | no fix listed | UBUNTU-CVE-2026-62426 |
| Ubuntu:26.10 | xen | no fix listed | UBUNTU-CVE-2026-62426 |
Affected products (as reported)
Weakness: CWE-667, CWE-412 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H