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.
http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00034.html
http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00038.html
https://git.qemu.org/?p=qemu.git;a=commit;h=de594e47659029316bbf9391efb79da0a1a08e08
https://lists.debian.org/debian-lts-announce/2019/09/msg00021.html
https://lists.debian.org/debian-lts-announce/2020/07/msg00020.html
https://lists.gnu.org/archive/html/qemu-devel/2019-08/msg01518.html
https://security-tracker.debian.org/tracker/CVE-2019-12068
https://usn.ubuntu.com/4191-1/
Source: MITRE
Published: 2019-09-24
Updated: 2020-07-26
Type: CWE-835
Base Score: 2.1
Vector: AV:L/AC:L/Au:N/C:N/I:N/A:P
Impact Score: 2.9
Exploitability Score: 3.9
Severity: LOW
Base Score: 3.8
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:L
Impact Score: 1.4
Exploitability Score: 2
Severity: LOW