Resource exhaustion in Xen
CVE-2022-42333
x86/HVM pinned cache attributes mis-handling T[his CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] To allow cachability control for HVM guests with passed through devices, an interface exists to explicitly override defaults which would otherwise be put in place. While not exposed to the affected guests themselves, the interface specifically exists for domains controlling such guests. This interface may therefore be used by not fully privileged entities, e.g. qemu running deprivileged in Dom0 or qemu running in a so called stub-domain. With this exposure it is an issue that - the number of the such controlled regions was unbounded (CVE-2022-42333), - installation and removal of such regions was not properly serialized (CVE-2022-42334).
EPSS: 0.012 (64.7th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.6 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H.
Affected products
- Xen — versions consult Xen advisory XSA-428
- Debian Debian_linux — versions 11.0
- Fedoraproject Fedora — versions 37, 38
Weakness classification (CWE)
References
- security@xen.org (Vendor Advisory)
- security@xen.org (Vendor Advisory)
- security@xen.org (mailing-list, Mailing List, Third Party Advisory)
- security@xen.org (vendor-advisory, Mailing List, Third Party Advisory)
- security@xen.org (vendor-advisory, Mailing List, Third Party Advisory)
- security@xen.org (vendor-advisory, Third Party Advisory)
- security@xen.org
Frequently asked questions
- What is CVE-2022-42333?
- CVE-2022-42333 is a high-severity vulnerability in Xen, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 8.6/10. Published 2023-03-21.
- How severe is CVE-2022-42333?
- High severity. CVSS v3 base score is 8.6 out of 10.