What’s Vulnerable › Vulnerabilities

CVE-2021-32845: Moby HyperKit uninitialized memory use vtrnd pci_vtrnd_notify

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-02-17 · updated 2026-06-17
• Weakness: CWE-908

Description

HyperKit is a toolkit for embedding hypervisor capabilities in an application. In versions 0.20210107 and prior of HyperKit, the implementation of `qnotify` at `pci_vtrnd_notify` fails to check the return value of `vq_getchain`. This leads to `struct iovec iov;` being uninitialized and used to read memory in `len = (int) read(sc->vrsc_fd, iov.iov_base, iov.iov_len);` when an attacker is able to make `vq_getchain` fail. This issue may lead to a guest crashing the host causing a denial of service and, under certain circumstance, memory corruption. This issue is fixed in commit 41272a980197917df8e58ff90642d14dec8fe948.

Affected products

• moby hyperkit: through 0.20210107

References

• https://github.com/moby/hyperkit/commit/41272a980197917df8e58ff90642d14dec8fe948
• https://github.com/moby/hyperkit/pull/313
• https://securitylab.github.com/advisories/GHSL-2021-054_057-moby-hyperkit/
• https://github.com/moby/hyperkit/commit/41272a980197917df8e58ff90642d14dec8fe948
• https://github.com/moby/hyperkit/pull/313
• https://securitylab.github.com/advisories/GHSL-2021-054_057-moby-hyperkit/

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