What is CVE-2018-19964?

CVE-2018-19964 is a medium-severity vulnerability in Xen. CVSS score: 6.5/10. Published 2018-12-08.

How severe is CVE-2018-19964?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Vulnerability in Xen

CVE-2018-19964

An issue was discovered in Xen 4.11.x allowing x86 guest OS users to cause a denial of service (host OS hang) because the p2m lock remains unavailable indefinitely in certain error conditions.

Published 2018-12-08 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.004 (27.1th percentile), scored 2026-10-02.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 27th percentile — 27.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

References

xenbits.xen.org/xsa/advisory-277.html (Patch, Mitigation, Vendor Advisory)
www.securityfocus.com/bid/106182 (VDB Entry, Third Party Advisory, vdb-entry)

Frequently asked questions

What is CVE-2018-19964?: CVE-2018-19964 is a medium-severity vulnerability in Xen. CVSS score: 6.5/10. Published 2018-12-08.
How severe is CVE-2018-19964?: Medium severity. CVSS v3 base score is 6.5 out of 10.