CVE-2021-3930
First published: Fri Nov 05 2021(Updated: )
An off-by-one error was found in the SCSI Device emulation in QEMU. It could occur in hw/scsi/scsi-disk.c:mode_sense_page() while processing MODE SELECT commands if 'page' was set to MODE_PAGE_ALLS (0x3f). Specifically, 'page' was used to index the stack-allocated 'mode_sense_valid' buffer (size=0x3f), causing an off-by-one error when trying to access the last element. A malicious guest could use this flaw to potentially crash QEMU, resulting in a denial of service condition.
Credit: secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/qemu-kvm | <6.2.0 | 6.2.0 |
| QEMU | <6.2.0 | |
| Red Hat CodeReady Linux Builder | =8.0 | |
| Red Hat CodeReady Linux Builder for IBM z Systems | =8.0 | |
| Red Hat CodeReady Linux Builder for Power, little endian | =8.0 | |
| Red Hat OpenStack for IBM Power | =10 | |
| Red Hat OpenStack for IBM Power | =13 | |
| Red Hat Enterprise Linux | =8.0 | |
| Red Hat Enterprise Linux Advanced Virtualization EUS | =8.4 | |
| Red Hat Enterprise Linux for IBM Z Systems | =8.0 | |
| Red Hat Enterprise Linux for Power, little endian | =8.0 | |
| Debian Linux | =9.0 | |
| Debian Linux | =10.0 | |
| debian/qemu | <=1:5.2+dfsg-11+deb11u2 | 1:5.2+dfsg-11+deb11u3 1:7.2+dfsg-7+deb12u12 1:9.2.2+ds-1 1:10.0.0~rc1+ds-2 |
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Reference Links
- https://bugzilla.redhat.com/show_bug.cgi?id=2020588
- https://security.netapp.com/advisory/ntap-20220225-0007/
- https://lists.debian.org/debian-lts-announce/2022/04/msg00002.html
- https://security.gentoo.org/glsa/202208-27
- https://lists.debian.org/debian-lts-announce/2022/09/msg00008.html
- https://launchpad.net/bugs/cve/CVE-2021-3930
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2020599
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2020598
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2020383
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2020588#c0
- https://www.mail-archive.com/qemu-devel@nongnu.org/msg779652.html
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2020588#c2
- https://bugs.launchpad.net/qemu/+bug/1914638
- https://gitlab.com/qemu-project/qemu/-/issues/546
- https://gitlab.com/qemu-project/qemu/-/issues/546#note_725175813
- https://lists.nongnu.org/archive/html/qemu-devel/2021-11/msg01896.html
- https://gitlab.com/qemu-project/qemu/-/commit/b3af7fdf9cc537f8f0dd3e2423d83f5c99a457e8
- https://access.redhat.com/errata/RHSA-2021:5065
- https://access.redhat.com/errata/RHSA-2021:5238
- https://access.redhat.com/errata/RHSA-2022:0081
- https://access.redhat.com/security/cve/cve-2021-3930
- https://security-tracker.debian.org/tracker/CVE-2021-3930
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-3930
- https://nvd.nist.gov/vuln/detail/CVE-2021-3930
- https://ubuntu.com/security/CVE-2021-3930
Frequently Asked Questions
What is CVE-2021-3930?
CVE-2021-3930 is an off-by-one error found in the SCSI device emulation in QEMU.
How does CVE-2021-3930 affect QEMU?
CVE-2021-3930 could potentially crash QEMU, resulting in a denial of service condition.
Which software versions are affected by CVE-2021-3930?
QEMU versions up to and excluding 6.2.0 are affected by CVE-2021-3930.
What is the severity of CVE-2021-3930?
CVE-2021-3930 has a severity rating of 6.5 (medium).
Where can I find more information about CVE-2021-3930?
You can find more information about CVE-2021-3930 on the Red Hat Bugzilla and NetApp security advisory websites, as well as the Debian LTS announce mailing list.
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