Vulnerability · Published Jul 28, 2026 · Assigned by XEN
CVE-2026-62432evtchn: Race between FIFO expand and reset
High 7.3
In plain English
A high-severity race condition 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 16% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)7.3High
Exploit odds (30 days)0.2%top 84.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
The EVTCHNOP_expand_array hypercall checks for whether FIFO event channels are enabled, but without holding the correct lock. It can race with EVTCHNOP_reset, resulting in dereferencing a NULL pointer.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.21 | xen | 4.19.6-r0 | ALPINE-CVE-2026-62432 |
| Alpine:v3.22 | xen | 4.20.4-r0 | ALPINE-CVE-2026-62432 |
| Alpine:v3.23 | xen | 4.20.4-r0 | ALPINE-CVE-2026-62432 |
| Alpine:v3.24 | xen | 4.21.2-r0 | ALPINE-CVE-2026-62432 |
| Debian:12 | xen | 4.17.7-0+deb12u1 | DEBIAN-CVE-2026-62432 |
| Debian:13 | xen | 4.20.3+127-gc42374a105-0+deb13u1 | DEBIAN-CVE-2026-62432 |
| Debian:14 | xen | 4.20.3+127-gc42374a105-1 | DEBIAN-CVE-2026-62432 |
| Ubuntu:22.04:LTS | xen | no fix listed | UBUNTU-CVE-2026-62432 |
| Ubuntu:24.04:LTS | xen | no fix listed | UBUNTU-CVE-2026-62432 |
| Ubuntu:26.04:LTS | xen | no fix listed | UBUNTU-CVE-2026-62432 |
| Ubuntu:26.10 | xen | no fix listed | UBUNTU-CVE-2026-62432 |
Affected products (as reported)
Weakness: CWE-362 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L