What’s Vulnerable › Vulnerabilities

CVE-2021-32847: Moby HyperKit uninitialized memory use in virtio-sock pci_vtsock_proc_tx

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2023-02-20 · updated 2026-06-17
• Weakness: CWE-125

Description

HyperKit is a toolkit for embedding hypervisor capabilities in an application. In versions 0.20210107 and prior, a malicious guest can trigger a vulnerability in the host by abusing the disk driver that may lead to the disclosure of the host memory into the virtualized guest. This issue is fixed in commit cf60095a4d8c3cb2e182a14415467afd356e982f.

Affected products

• moby hyperkit: through 0.20210107

References

• https://github.com/moby/hyperkit/blob/2f061e447e1435cdf1b9eda364cea6414f2c606b/src/lib/pci_virtio_block.c#L316
• https://github.com/moby/hyperkit/commit/cf60095a4d8c3cb2e182a14415467afd356e982f
• https://securitylab.github.com/advisories/GHSL-2021-058-moby-hyperkit/
• https://github.com/moby/hyperkit/blob/2f061e447e1435cdf1b9eda364cea6414f2c606b/src/lib/pci_virtio_block.c#L316
• https://github.com/moby/hyperkit/commit/cf60095a4d8c3cb2e182a14415467afd356e982f
• https://securitylab.github.com/advisories/GHSL-2021-058-moby-hyperkit/

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