Vulnerability · Published Nov 1, 2022 · Assigned by XEN
CVE-2022-42324
Medium 5.5
In plain English
A medium-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 0.3% (higher than 23% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
Oxenstored 32->31 bit integer truncation issues Integers in Ocaml are 63 or 31 bits of signed precision. The Ocaml Xenbus library takes a C uint32_t out of the ring and casts it directly to an Ocaml integer. In 64-bit Ocaml builds this is fine, but in 32-bit builds, it truncates off the most significant bit, and then creates unsigned/signed confusion in the remainder. This in turn can feed a negative value into logic not expecting a negative value, resulting in unexpected exceptions being thrown. The unexpected exception is not handled suitably, creating a busy-loop trying (and failing) to take the bad packet out of the xenstore ring.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.20 | xen | 4.17.0-r0 | ALPINE-CVE-2022-42324 |
| Alpine:v3.21 | xen | 4.17.0-r0 | ALPINE-CVE-2022-42324 |
| Alpine:v3.22 | xen | 4.17.0-r0 | ALPINE-CVE-2022-42324 |
| Alpine:v3.23 | xen | 4.17.0-r0 | ALPINE-CVE-2022-42324 |
| Alpine:v3.24 | xen | 4.17.0-r0 | ALPINE-CVE-2022-42324 |
| Debian:12 | xen | 4.16.2+90-g0d39a6d1ae-1 | DEBIAN-CVE-2022-42324 |
| Debian:13 | xen | 4.16.2+90-g0d39a6d1ae-1 | DEBIAN-CVE-2022-42324 |
| Debian:14 | xen | 4.16.2+90-g0d39a6d1ae-1 | DEBIAN-CVE-2022-42324 |
| Ubuntu:22.04:LTS | xen | no fix listed | UBUNTU-CVE-2022-42324 |
| Ubuntu:24.04:LTS | xen | no fix listed | UBUNTU-CVE-2022-42324 |
| Ubuntu:25.10 | xen | no fix listed | UBUNTU-CVE-2022-42324 |
| Ubuntu:26.04:LTS | xen | no fix listed | UBUNTU-CVE-2022-42324 |
| Ubuntu:26.10 | xen | no fix listed | UBUNTU-CVE-2022-42324 |
Affected products (as reported)
References
- https://xenbits.xenproject.org/xsa/advisory-420.txt
- http://xenbits.xen.org/xsa/advisory-420.html
- [oss-security] 20221101 Xen Security Advisory 420 v2 (CVE-2022-42324) - Oxenstored 32->31 bit integer truncation issues mailing-list
- DSA-5272 vendor-advisory
- FEDORA-2022-07438e12df vendor-advisory
- FEDORA-2022-99af00f60e vendor-advisory
- FEDORA-2022-9f51d13fa3 vendor-advisory
- GLSA-202402-07 vendor-advisory