What is CVE-2019-12068?

CVE-2019-12068 is a low-severity vulnerability in Qemu, classified under Loop with Unreachable Exit Condition (Infinite Loop). CVSS score: 3.8/10. Published 2019-09-24.

How severe is CVE-2019-12068?

Low severity. CVSS v3 base score is 3.8 out of 10.

Vulnerability in Qemu

CVE-2019-12068

In QEMU 1:4.1-1, 1:2.1+dfsg-12+deb8u6, 1:2.8+dfsg-6+deb9u8, 1:3.1+dfsg-8~deb10u1, 1:3.1+dfsg-8+deb10u2, and 1:2.1+dfsg-12+deb8u12 (fixed), when executing script in lsi_execute_script(), the LSI scsi adapter emulator advances 's->dsp' index to read next opcode. This can lead to an infinite loop if the next opcode is empty. Move the existing loop exit after 10k iterations so that it covers no-op opcodes as well.

Published 2019-09-24 · 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: 0.005 (41.1th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 41st percentile — 41.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000

Affected products

Qemu — versions 1\, 1:3.1+dfsg-8~deb10u1, 1:2.8+dfsg-6+deb9u8
Canonical Ubuntu Linux — versions 14.04, 16.04, 18.04
Debian Linux — versions 8.0, 9.0, 10.0
openSUSE Leap — versions 15.0, 15.1

Weakness classification (CWE)

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

References

lists.debian.org/debian-lts-announce/2019/09/msg00021.html (mailing-list, Mailing List, Third Party Advisory)
lists.gnu.org/archive/html/qemu-devel/2019-08/msg01518.html (Patch, Mailing List, Third Party Advisory)
git.qemu.org/
security-tracker.debian.org/tracker/CVE-2019-12068 (Third Party Advisory)
usn.ubuntu.com/4191-2/ (vendor-advisory, Third Party Advisory)
lists.opensuse.org/opensuse-security-announce/2019-11/msg00034.html (vendor-advisory, Third Party Advisory)
lists.opensuse.org/opensuse-security-announce/2019-11/msg00038.html (vendor-advisory, Third Party Advisory)
usn.ubuntu.com/4191-1/ (vendor-advisory, Third Party Advisory)
www.debian.org/security/2020/dsa-4665 (vendor-advisory)
lists.debian.org/debian-lts-announce/2020/07/msg00020.html (mailing-list)

Frequently asked questions

What is CVE-2019-12068?: CVE-2019-12068 is a low-severity vulnerability in Qemu, classified under Loop with Unreachable Exit Condition (Infinite Loop). CVSS score: 3.8/10. Published 2019-09-24.
How severe is CVE-2019-12068?: Low severity. CVSS v3 base score is 3.8 out of 10.