CVE-2021-3930 Denial of service in QEMU
Medium 6.5
Published
Updated
Check this codebase for CVE-2021-3930 and fix it if it is affected.
What it is: CVE-2021-3930 is a medium-severity denial of service vulnerability in Debian Debian Linux, published on 18 Feb 2022. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2021-3930 in the wild and no public exploit code.
Affected product: Debian Debian Linux. No package-level version data is available, so check the vendor advisory linked from the reference page.
Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.
Reference: https://insights.sbomify.com/CVE-2021-3930/ (Markdown: https://insights.sbomify.com/CVE-2021-3930/index.md)
A malicious guest can crash the QEMU emulator via an off-by-one error in SCSI device emulation, causing a denial of service.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-3930?
CVE-2021-3930 is a medium-severity denial of service vulnerability in Debian Debian Linux, published on 18 Feb 2022. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
An off-by-one error was found in the SCSI device emulation in QEMU. It could occur while processing MODE SELECT commands in mode_sense_page() if the 'page' argument was set to MODE_PAGE_ALLS (0x3f). A malicious guest could use this flaw to potentially crash QEMU, resulting in a denial of service condition.
Weakness: CWE-193
Which versions are affected by CVE-2021-3930?
It affects 10 products.
Linux distribution packages (40)
SLOF Red Hat:advanced_virtualization:8.4::el8 | All versions | 0:20200717-1.gite18ddad8.module+el8.4.0+8855+a9e237a9 |
hivex Red Hat:advanced_virtualization:8.4::el8 | All versions | 0:1.3.18-21.module+el8.4.0+11609+2eba841a |
hivex-debuginfo Red Hat:advanced_virtualization:8.4::el8 | All versions | 0:1.3.18-21.module+el8.4.0+11609+2eba841a |
hivex-debugsource Red Hat:advanced_virtualization:8.4::el8 | All versions | 0:1.3.18-21.module+el8.4.0+11609+2eba841a |
hivex-devel Red Hat:advanced_virtualization:8.4::el8 | All versions | 0:1.3.18-21.module+el8.4.0+11609+2eba841a |
libguestfs Red Hat:advanced_virtualization:8.4::el8 | All versions | 1:1.44.0-2.module+el8.4.0+10146+75917d2f |
libguestfs-bash-completion Red Hat:advanced_virtualization:8.4::el8 | All versions | 1:1.44.0-2.module+el8.4.0+10146+75917d2f |
libguestfs-debuginfo Red Hat:advanced_virtualization:8.4::el8 | All versions | 1:1.44.0-2.module+el8.4.0+10146+75917d2f |
libguestfs-debugsource Red Hat:advanced_virtualization:8.4::el8 | All versions | 1:1.44.0-2.module+el8.4.0+10146+75917d2f |
libguestfs-devel Red Hat:advanced_virtualization:8.4::el8 | All versions | 1:1.44.0-2.module+el8.4.0+10146+75917d2f |
libguestfs-gfs2 Red Hat:advanced_virtualization:8.4::el8 | All versions | 1:1.44.0-2.module+el8.4.0+10146+75917d2f |
libguestfs-gobject Red Hat:advanced_virtualization:8.4::el8 | All versions | 1:1.44.0-2.module+el8.4.0+10146+75917d2f |
libguestfs-gobject-debuginfo Red Hat:advanced_virtualization:8.4::el8 | All versions | 1:1.44.0-2.module+el8.4.0+10146+75917d2f |
libguestfs-gobject-devel Red Hat:advanced_virtualization:8.4::el8 | All versions | 1:1.44.0-2.module+el8.4.0+10146+75917d2f |
libguestfs-inspect-icons Red Hat:advanced_virtualization:8.4::el8 | All versions | 1:1.44.0-2.module+el8.4.0+10146+75917d2f |
libguestfs-java Red Hat:advanced_virtualization:8.4::el8 | All versions | 1:1.44.0-2.module+el8.4.0+10146+75917d2f |
libguestfs-java-debuginfo Red Hat:advanced_virtualization:8.4::el8 | All versions | 1:1.44.0-2.module+el8.4.0+10146+75917d2f |
libguestfs-java-devel Red Hat:advanced_virtualization:8.4::el8 | All versions | 1:1.44.0-2.module+el8.4.0+10146+75917d2f |
libguestfs-javadoc Red Hat:advanced_virtualization:8.4::el8 | All versions | 1:1.44.0-2.module+el8.4.0+10146+75917d2f |
libguestfs-man-pages-ja Red Hat:advanced_virtualization:8.4::el8 | All versions | 1:1.44.0-2.module+el8.4.0+10146+75917d2f |
libguestfs-man-pages-uk Red Hat:advanced_virtualization:8.4::el8 | All versions | 1:1.44.0-2.module+el8.4.0+10146+75917d2f |
libguestfs-rescue Red Hat:advanced_virtualization:8.4::el8 | All versions | 1:1.44.0-2.module+el8.4.0+10146+75917d2f |
libguestfs-rsync Red Hat:advanced_virtualization:8.4::el8 | All versions | 1:1.44.0-2.module+el8.4.0+10146+75917d2f |
libguestfs-tools Red Hat:advanced_virtualization:8.4::el8 | All versions | 1:1.44.0-2.module+el8.4.0+10146+75917d2f |
libguestfs-tools-c Red Hat:advanced_virtualization:8.4::el8 | All versions | 1:1.44.0-2.module+el8.4.0+10146+75917d2f |
libguestfs-tools-c-debuginfo Red Hat:advanced_virtualization:8.4::el8 | All versions | 1:1.44.0-2.module+el8.4.0+10146+75917d2f |
libguestfs-winsupport Red Hat:advanced_virtualization:8.4::el8 | All versions | 0:8.2-2.module+el8.4.0+12717+0b0da9ad |
libguestfs-xfs Red Hat:advanced_virtualization:8.4::el8 | All versions | 1:1.44.0-2.module+el8.4.0+10146+75917d2f |
libiscsi Red Hat:advanced_virtualization:8.4::el8 | All versions | 0:1.18.0-8.module+el8.4.0+8855+a9e237a9 |
libiscsi-debuginfo Red Hat:advanced_virtualization:8.4::el8 | All versions | 0:1.18.0-8.module+el8.4.0+8855+a9e237a9 |
libiscsi-debugsource Red Hat:advanced_virtualization:8.4::el8 | All versions | 0:1.18.0-8.module+el8.4.0+8855+a9e237a9 |
libiscsi-devel Red Hat:advanced_virtualization:8.4::el8 | All versions | 0:1.18.0-8.module+el8.4.0+8855+a9e237a9 |
libiscsi-utils Red Hat:advanced_virtualization:8.4::el8 | All versions | 0:1.18.0-8.module+el8.4.0+8855+a9e237a9 |
libiscsi-utils-debuginfo Red Hat:advanced_virtualization:8.4::el8 | All versions | 0:1.18.0-8.module+el8.4.0+8855+a9e237a9 |
libnbd Red Hat:advanced_virtualization:8.4::el8 | All versions | 0:1.6.0-3.module+el8.4.0+9856+bbc47853 |
libnbd-bash-completion Red Hat:advanced_virtualization:8.4::el8 | All versions | 0:1.6.0-3.module+el8.4.0+9856+bbc47853 |
libnbd-debuginfo Red Hat:advanced_virtualization:8.4::el8 | All versions | 0:1.6.0-3.module+el8.4.0+9856+bbc47853 |
libnbd-debugsource Red Hat:advanced_virtualization:8.4::el8 | All versions | 0:1.6.0-3.module+el8.4.0+9856+bbc47853 |
libnbd-devel Red Hat:advanced_virtualization:8.4::el8 | All versions | 0:1.6.0-3.module+el8.4.0+9856+bbc47853 |
libtpms Red Hat:advanced_virtualization:8.4::el8 | All versions | 0:0.7.4-4.20201106git2452a24dab.module+el8.4.0+10596+32ba7df3 |
Products include Debian Debian Linux, Qemu Qemu, Redhat Codeready Linux Builder, Redhat Codeready Linux Builder for Ibm Z Systems, Redhat Codeready Linux Builder for Power Little Endian, Redhat Enterprise Linux and 4 more.
How do I fix CVE-2021-3930?
Apply the vendor's patch.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2021-3930 being exploited?
There is no known exploitation of CVE-2021-3930 in the wild and no public exploit code.
Other vulnerabilities in Debian Debian Linux
Sources
Also known as AZL-8671, DEBIAN-CVE-2021-3930, GHSA-2v9g-p8fq-vvh2, RHSA-2021:5065, UBUNTU-CVE-2021-3930.