CVE-2021-32847

Moby HyperKit uninitialized memory use in virtio-sock pci_vtsock_proc_tx

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

moby · hyperkit

CVSS v3.1 NVD

6.5 MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

CVSS v3.1 GITHUB

7.1 HIGHCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

EPSS

0.37% chance of exploitation in the next 30 days, 29th percentile

Published

2023-02-20

Updated

2025-03-10

Proof-of-concept exploits (1)

• https://securitylab.github.com/advisories/GHSL-2021-058-moby-hyperkit/

Security advisories

• https://securitylab.github.com/advisories/GHSL-2021-058-moby-hyperkit
• moby/hyperkit/blob/2f061e447e1435cdf1b9eda364cea6414f2c606b/src/lib/pci_virtio_block.c#L3…

References

• CVE Record
• NVD entry