Vulnerability in Xen
CVE-2022-42322
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.
EPSS: 0.003 (20.0th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
Affected products
- Xen — versions consult Xen advisory XSA-419
- Debian Debian_linux — versions 11.0
- Fedoraproject Fedora — versions 35, 36, 37
Weakness classification (CWE)
References
- security@xen.org (Patch, Vendor Advisory)
- security@xen.org (Patch, Vendor Advisory)
- security@xen.org (mailing-list, Patch, Mailing List, Third Party Advisory)
- security@xen.org (vendor-advisory, Third Party Advisory)
- security@xen.org (vendor-advisory)
- security@xen.org (vendor-advisory)
- security@xen.org (vendor-advisory)
- security@xen.org (vendor-advisory)
Frequently asked questions
- What is CVE-2022-42322?
- CVE-2022-42322 is a medium-severity vulnerability in Xen, classified under Missing Release of Memory after Effective Lifetime. CVSS score: 5.5/10. Published 2022-11-01.
- How severe is CVE-2022-42322?
- Medium severity. CVSS v3 base score is 5.5 out of 10.