CVE-2023-42467: Divide by Zero
First published: Mon Sep 11 2023(Updated: )
QEMU through 8.0.0 could trigger a division by zero in scsi_disk_reset in hw/scsi/scsi-disk.c because scsi_disk_emulate_mode_select does not prevent s->qdev.blocksize from being 256. This stops QEMU and the guest immediately.
Credit: cve@mitre.org cve@mitre.org cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| ubuntu/qemu | <1:7.2+dfsg-5ubuntu2.4 | 1:7.2+dfsg-5ubuntu2.4 |
| ubuntu/qemu | <1:8.0.4+dfsg-1ubuntu3.23.10.2 | 1:8.0.4+dfsg-1ubuntu3.23.10.2 |
| ubuntu/qemu | <1:8.1.3+ | 1:8.1.3+ |
| debian/qemu | 1:5.2+dfsg-11+deb11u3 1:5.2+dfsg-11+deb11u2 1:7.2+dfsg-7+deb12u7 1:9.0.2+ds-2 1:9.1.0+ds-3 | |
| QEMU KVM | <=8.0.0 |
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Reference Links
- https://gitlab.com/qemu-project/qemu/-/commit/7cfcc79b0ab800959716738aff9419f53fc68c9c
- https://gitlab.com/qemu-project/qemu/-/issues/1813
- https://security.netapp.com/advisory/ntap-20231103-0005/
- https://launchpad.net/bugs/cve/CVE-2023-42467
- https://gitlab.com/thuth/qemu/-/commit/3f91104484e5bf55b56d7e1b039a4a5a17d0c1a7
- https://ubuntu.com/security/notices/USN-6567-1
- https://www.cve.org/CVERecord?id=CVE-2023-42467
- https://nvd.nist.gov/vuln/detail/CVE-2023-42467
- https://security-tracker.debian.org/tracker/CVE-2023-42467
- https://ubuntu.com/security/CVE-2023-42467
- https://gitlab.com/qemu-project/qemu/-/commit/356c4c441ec01910314c5867c680bef80d1dd373
- https://gitlab.com/qemu-project/qemu/-/commit/55794c904df723109b228da28b5db778e0df3110
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2238573
- https://access.redhat.com/errata/RHSA-2024:2135
- https://bugzilla.redhat.com/show_bug.cgi?id=2238291
Frequently Asked Questions
What is CVE-2023-42467?
CVE-2023-42467 is a vulnerability in QEMU versions up to 8.0.0 that could trigger a division by zero, leading to a denial of service (DoS) condition.
How does CVE-2023-42467 impact QEMU?
CVE-2023-42467 can be exploited to cause QEMU to crash, resulting in the immediate termination of the QEMU process and the guest system.
What is the severity of CVE-2023-42467?
CVE-2023-42467 has a medium severity rating, with a CVSS score of 5.5.
How can I mitigate CVE-2023-42467?
To mitigate CVE-2023-42467, you should update your QEMU installation to a version that is not affected by this vulnerability.
Where can I find more information about CVE-2023-42467?
You can find more information about CVE-2023-42467 at the official GitLab page for QEMU and the associated commit.
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