Vulnerability · Published Nov 1, 2022 · Assigned by XEN
CVE-2022-42323
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
Xenstore: Cooperating guests can create arbitrary numbers of nodes T[his CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] Since the fix of XSA-322 any Xenstore node owned by a removed domain will be modified to be owned by Dom0. This will allow two malicious guests working together to create an arbitrary number of Xenstore nodes. This is possible by domain A letting domain B write into domain A's local Xenstore tree. Domain B can then create many nodes and reboot. The nodes created by domain B will now be owned by Dom0. By repeating this process over and over again an arbitrary number of nodes can be created, as Dom0's number of nodes isn't limited by Xenstore quota.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.20 | xen | 4.17.0-r0 | ALPINE-CVE-2022-42323 |
| Alpine:v3.21 | xen | 4.17.0-r0 | ALPINE-CVE-2022-42323 |
| Alpine:v3.22 | xen | 4.17.0-r0 | ALPINE-CVE-2022-42323 |
| Alpine:v3.23 | xen | 4.17.0-r0 | ALPINE-CVE-2022-42323 |
| Alpine:v3.24 | xen | 4.17.0-r0 | ALPINE-CVE-2022-42323 |
| Debian:12 | xen | 4.16.2+90-g0d39a6d1ae-1 | DEBIAN-CVE-2022-42323 |
| Debian:13 | xen | 4.16.2+90-g0d39a6d1ae-1 | DEBIAN-CVE-2022-42323 |
| Debian:14 | xen | 4.16.2+90-g0d39a6d1ae-1 | DEBIAN-CVE-2022-42323 |
| Ubuntu:22.04:LTS | xen | no fix listed | UBUNTU-CVE-2022-42323 |
| Ubuntu:24.04:LTS | xen | no fix listed | UBUNTU-CVE-2022-42323 |
| Ubuntu:25.10 | xen | no fix listed | UBUNTU-CVE-2022-42323 |
| Ubuntu:26.04:LTS | xen | no fix listed | UBUNTU-CVE-2022-42323 |
| Ubuntu:26.10 | xen | no fix listed | UBUNTU-CVE-2022-42323 |
Affected products (as reported)
References
- https://xenbits.xenproject.org/xsa/advisory-419.txt
- http://xenbits.xen.org/xsa/advisory-419.html
- [oss-security] 20221101 Xen Security Advisory 419 v2 (CVE-2022-42322,CVE-2022-42323) - Xenstore: Cooperating guests can create arbitrary numbers of nodes 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