CVE-2021-32843 Null dereference in hyperkit

What is CVE-2021-32843?

CVE-2021-32843 is a medium-severity vulnerability in moby hyperkit, published on 17 Feb 2023. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

HyperKit is a toolkit for embedding hypervisor capabilities in an application. In versions 0.20210107 and prior of HyperKit, `virtio.c` has is a call to `vc_cfgread` that does not check for null which when called makes the host crash. This issue may lead to a guest crashing the host causing a denial of service. This issue is fixed in commit df0e46c7dbfd81a957d85e449ba41b52f6f7beb4.

Weakness: CWE-476

Which versions are affected by CVE-2021-32843?

It affects 1 product.

Products include Mobyproject Hyperkit.

How do I fix CVE-2021-32843?

No fix has been published for CVE-2021-32843 yet. Limit exposure of the affected software until one is available.

Is CVE-2021-32843 being exploited?

There is no known exploitation of CVE-2021-32843 in the wild and no public exploit code.

Other vulnerabilities in moby hyperkit

• CVE-2021-32845 Moby HyperKit uninitialized memory use vtrnd pci_vtrnd_notify High 7.7
• CVE-2021-32846 Moby HyperKit uninitialized memory use in virtio-sock pci_vtsock_proc_tx High 7.7
• CVE-2021-32847 Moby HyperKit uninitialized memory use in virtio-sock pci_vtsock_proc_tx High 7.1
• CVE-2021-32844 Null dereference in hyperkit Medium 6.2

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-x6m4-8q2v-7x97.