What is CVE-2022-42326?

CVE-2022-42326 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-2022-42326?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Vulnerability in Xen

CVE-2022-42326

Xenstore: Guests can create arbitrary number of nodes via transactions T[his CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] In case a node has been created in a transaction and it is later deleted in the same transaction, the transaction will be terminated with an error. As this error is encountered only when handling the deleted node at transaction finalization, the transaction will have been performed partially and without updating the accounting information. This will enable a malicious guest to create arbitrary number of nodes.

Published 2022-11-01 · last modified 2026-06-17.

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.

EPSS exploit prediction

EPSS: 0.003 (19.4th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 19th percentile — 19.4% 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-421
Debian Linux — versions 11.0
Fedoraproject Fedora — versions 35, 36, 37

Weakness classification (CWE)

CWE-401 — Missing Release of Memory after Effective Lifetime

References

xenbits.xenproject.org/xsa/advisory-421.txt (Patch, Vendor Advisory)
xenbits.xen.org/xsa/advisory-421.html (Patch, Vendor Advisory)
www.openwall.com/lists/oss-security/2022/11/01/11 (mailing-list, Patch, Mailing List, Third Party 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)
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-2022-42326?: CVE-2022-42326 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-2022-42326?: Medium severity. CVSS v3 base score is 5.5 out of 10.