Vulnerability · Published Nov 1, 2022 · Assigned by XEN
CVE-2022-42316
Medium 6.5
In plain English
A medium-severity resource allocation without limits 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 19% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
Xenstore: guests can let run xenstored out of memory T[his CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] Malicious guests can cause xenstored to allocate vast amounts of memory, eventually resulting in a Denial of Service (DoS) of xenstored. There are multiple ways how guests can cause large memory allocations in xenstored: - - by issuing new requests to xenstored without reading the responses, causing the responses to be buffered in memory - - by causing large number of watch events to be generated via setting up multiple xenstore watches and then e.g. deleting many xenstore nodes below the watched path - - by creating as many nodes as allowed with the maximum allowed size and path length in as many transactions as possible - - by accessing many nodes inside a transaction
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.20 | xen | 4.17.0-r0 | ALPINE-CVE-2022-42316 |
| Alpine:v3.21 | xen | 4.17.0-r0 | ALPINE-CVE-2022-42316 |
| Alpine:v3.22 | xen | 4.17.0-r0 | ALPINE-CVE-2022-42316 |
| Alpine:v3.23 | xen | 4.17.0-r0 | ALPINE-CVE-2022-42316 |
| Alpine:v3.24 | xen | 4.17.0-r0 | ALPINE-CVE-2022-42316 |
| Debian:12 | xen | 4.16.2+90-g0d39a6d1ae-1 | DEBIAN-CVE-2022-42316 |
| Debian:13 | xen | 4.16.2+90-g0d39a6d1ae-1 | DEBIAN-CVE-2022-42316 |
| Debian:14 | xen | 4.16.2+90-g0d39a6d1ae-1 | DEBIAN-CVE-2022-42316 |
| Ubuntu:22.04:LTS | xen | no fix listed | UBUNTU-CVE-2022-42316 |
| Ubuntu:24.04:LTS | xen | no fix listed | UBUNTU-CVE-2022-42316 |
| Ubuntu:25.10 | xen | no fix listed | UBUNTU-CVE-2022-42316 |
| Ubuntu:26.04:LTS | xen | no fix listed | UBUNTU-CVE-2022-42316 |
| Ubuntu:26.10 | xen | no fix listed | UBUNTU-CVE-2022-42316 |
Affected products (as reported)
Weakness: CWE-770 · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
References
- https://xenbits.xenproject.org/xsa/advisory-326.txt
- http://xenbits.xen.org/xsa/advisory-326.html
- DSA-5272 vendor-advisory
- FEDORA-2022-07438e12df vendor-advisory
- FEDORA-2022-99af00f60e vendor-advisory
- FEDORA-2022-9f51d13fa3 vendor-advisory