{"id":"CVE-2021-32844","details":"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.","modified":"2026-04-11T17:25:59.412094Z","published":"2023-02-17T23:15:11.887Z","references":[{"type":"ADVISORY","url":"https://securitylab.github.com/advisories/GHSL-2021-054_057-moby-hyperkit/"},{"type":"FIX","url":"https://github.com/moby/hyperkit/commit/451558fe8aaa8b24e02e34106e3bb9fe41d7ad13"},{"type":"FIX","url":"https://github.com/moby/hyperkit/pull/313"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/moby/hyperkit","events":[{"introduced":"0"},{"last_affected":"40cbd5caa9580e2b6de8fef53f4581943c430312"},{"fixed":"451558fe8aaa8b24e02e34106e3bb9fe41d7ad13"}],"database_specific":{"versions":[{"introduced":"0"},{"last_affected":"0.20210107"}]}}],"versions":["v0.20170214","v0.20170227","v0.20170425","v0.20170511","v0.20170519","v0.20170904","v0.20171020","v0.20171204","v0.20180621","v0.20190201","v0.20190802","v0.20200224","v0.20200908","v0.20210107"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-32844.json","vanir_signatures_modified":"2026-04-11T17:25:59Z","vanir_signatures":[{"signature_version":"v1","target":{"file":"src/lib/virtio.c","function":"vi_pci_write"},"id":"CVE-2021-32844-901c6b33","deprecated":false,"source":"https://github.com/moby/hyperkit/commit/451558fe8aaa8b24e02e34106e3bb9fe41d7ad13","signature_type":"Function","digest":{"length":2931,"function_hash":"147428864900504555325010098442511855567"}},{"signature_version":"v1","target":{"file":"src/lib/virtio.c"},"id":"CVE-2021-32844-954438f6","deprecated":false,"source":"https://github.com/moby/hyperkit/commit/451558fe8aaa8b24e02e34106e3bb9fe41d7ad13","signature_type":"Line","digest":{"threshold":0.9,"line_hashes":["27600109711837502342970271220179049041","332855437583339418914141984933401851115","80563983225965591535718958744148807913","141247226162631951124093854780487189898","44554842436581024155871805227358743936"]}}]}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}