{"id":"CVE-2021-32843","details":"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.","modified":"2026-04-11T17:25:59.643354Z","published":"2023-02-17T23:15:11.803Z","references":[{"type":"ADVISORY","url":"https://securitylab.github.com/advisories/GHSL-2021-054_057-moby-hyperkit/"},{"type":"FIX","url":"https://github.com/moby/hyperkit/commit/df0e46c7dbfd81a957d85e449ba41b52f6f7beb4"},{"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":"df0e46c7dbfd81a957d85e449ba41b52f6f7beb4"}],"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":{"vanir_signatures_modified":"2026-04-11T17:25:59Z","vanir_signatures":[{"signature_version":"v1","target":{"file":"src/lib/virtio.c"},"source":"https://github.com/moby/hyperkit/commit/df0e46c7dbfd81a957d85e449ba41b52f6f7beb4","id":"CVE-2021-32843-9d723de8","digest":{"threshold":0.9,"line_hashes":["224111426657794017222298120075263625023","82295266099892006206297459276116583600","340041188620932699314649500017566946092","103468498027258180610024703107301908116"]},"deprecated":false,"signature_type":"Line"},{"signature_version":"v1","target":{"function":"vi_pci_read","file":"src/lib/virtio.c"},"source":"https://github.com/moby/hyperkit/commit/df0e46c7dbfd81a957d85e449ba41b52f6f7beb4","id":"CVE-2021-32843-acce9496","digest":{"length":2253,"function_hash":"264497553889318156854896604052411427726"},"deprecated":false,"signature_type":"Function"}],"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-32843.json"}}],"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"}]}