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.

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.

Published 2022-10-11 · last modified 2026-06-17.

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.

EPSS exploit prediction

EPSS: 0.003 (18.1th percentile), scored 2026-10-02.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 18th percentile — 18.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: +0.000

Affected products

Xen — versions consult Xen advisory XSA-409
Debian Linux — versions 11.0
Fedoraproject Fedora — versions 35, 36, 37

Weakness classification (CWE)

CWE-404 — Improper Resource Shutdown or Release

Public proof-of-concept exploits

ARPSyndicate/cvemon

References

xenbits.xenproject.org/xsa/advisory-409.txt (Patch, Vendor Advisory)
xenbits.xen.org/xsa/advisory-409.html (Patch, Vendor Advisory)
www.openwall.com/lists/oss-security/2022/10/11/5 (mailing-list, Patch, Mailing List, Third Party Advisory)
lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
www.debian.org/security/2022/dsa-5272 (vendor-advisory, Third Party Advisory)
lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
security.gentoo.org/glsa/202402-07 (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.