What is CVE-2019-19582?

CVE-2019-19582 is a medium-severity vulnerability in Xen, classified under Loop with Unreachable Exit Condition (Infinite Loop). CVSS score: 6.5/10. Published 2019-12-11.

How severe is CVE-2019-19582?

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

Vulnerability in Xen

CVE-2019-19582

An issue was discovered in Xen through 4.12.x allowing x86 guest OS users to cause a denial of service (infinite loop) because certain bit iteration is mishandled. In a number of places bitmaps are being used by the hypervisor to track certain state. Iteration over all bits involves functions which may misbehave in certain corner cases: On x86 accesses to bitmaps with a compile time known size of 64 may incur undefined behavior, which may in particular result in infinite loops. A malicious guest may cause a hypervisor crash or hang, resulting in a Denial of Service (DoS). All versions of Xen are vulnerable. x86 systems with 64 or more nodes are vulnerable (there might not be any such systems that Xen would run on). x86 systems with less than 64 nodes are not vulnerable.

Published 2019-12-11 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.004 (29.2th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 29th percentile — 29.2% 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

Xen
Fedoraproject Fedora — versions 31

Weakness classification (CWE)

CWE-835 — Loop with Unreachable Exit Condition (Infinite Loop)

References

xenbits.xen.org/xsa/advisory-307.html (Patch, 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)
lists.opensuse.org/opensuse-security-announce/2020-01/msg00011.html (vendor-advisory)
www.debian.org/security/2020/dsa-4602 (vendor-advisory)
seclists.org/bugtraq/2020/Jan/21 (mailing-list)
security.gentoo.org/glsa/202003-56 (vendor-advisory)

Frequently asked questions

What is CVE-2019-19582?: CVE-2019-19582 is a medium-severity vulnerability in Xen, classified under Loop with Unreachable Exit Condition (Infinite Loop). CVSS score: 6.5/10. Published 2019-12-11.
How severe is CVE-2019-19582?: Medium severity. CVSS v3 base score is 6.5 out of 10.