Track vulnerabilities like this one. Sign up free to get alerted when software you use is affected.

CVE-2021-32844: Old HyperKit versions can crash the host from a guest application

CVE-2021-32844 · published 3 years ago

Summary

Old versions of HyperKit can be made to crash the host if a guest application exploits a flaw. This could cause downtime and lost productivity. Update to the latest version of HyperKit to fix this issue.

What to do

The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.

Affected software

Vendor	Product	Affected versions
mobyproject	hyperkit	<= 0.20210107 `cpe:2.3:a:mobyproject:hyperkit::::::::`

Original advisory text

HyperKit is a toolkit for embedding hypervisor capabilities in an application. In versions 0.20210107 and prior of HyperKit, ` vi_pci_write` has is a call to `vc_cfgwrite` 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 451558fe8aaa8b24e02e34106e3bb9fe41d7ad13.

References

https://github.com/moby/hyperkit/commit/451558fe8aaa8b24e02e34106e3bb9fe41d7ad13 Patch
https://github.com/moby/hyperkit/pull/313 Patch
https://securitylab.github.com/advisories/GHSL-2021-054_057-moby-hyperkit/ Third Party Advisory

Fix within

Internet-facing 60 days

Internal At next upgrade

Not known to be exploited
Needs hands-on effort to exploit
Gives an attacker partial control

Severity

5.5 Medium

Exploitation

<1% chance of attack within 30 days

Type

CWE-476NULL Pointer Dereference

Timeline

Published17 Feb 2023

Updated4 Nov 2026

First seen11 Apr 2026

Sources

CVE-2021-32844 · OSV

CVE-2021-32844 · NVD

Track software like this

Free during beta