Vulnerability in Xen
CVE-2022-33747
Arm: unbounded memory consumption for 2nd-level page tables Certain actions require e.g. removing pages from a guest's P2M (Physical-to-Machine) mapping. When large pages are in use to map guest pages in the 2nd-stage page tables, such a removal operation may incur a memory allocation (to replace a large mapping with individual smaller ones). These memory allocations are taken from the global memory pool. A malicious guest might be able to cause the global memory pool to be exhausted by manipulating its own P2M mappings.
EPSS: 0.003 (19.1th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 3.8 (Low). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:L.
Affected products
- Xen — versions consult Xen advisory XSA-409
- Debian Debian_linux — versions 11.0
- Fedoraproject Fedora — versions 35, 36, 37
Weakness classification (CWE)
Public proof-of-concept exploits
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)
- security@xen.org (vendor-advisory, Third Party Advisory)
- security@xen.org (vendor-advisory)
- security@xen.org (vendor-advisory)
- security@xen.org (vendor-advisory)
Frequently asked questions
- What is CVE-2022-33747?
- CVE-2022-33747 is a low-severity vulnerability in Xen, classified under Improper Resource Shutdown or Release. CVSS score: 3.8/10. Published 2022-10-11.
- How severe is CVE-2022-33747?
- Low severity. CVSS v3 base score is 3.8 out of 10.
- Is CVE-2022-33747 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.