{"id":"CVE-2021-32845","details":"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-\u003evrsc_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.","modified":"2026-04-11T17:26:00.104439Z","published":"2023-02-17T23:15:11.963Z","references":[{"type":"ADVISORY","url":"https://securitylab.github.com/advisories/GHSL-2021-054_057-moby-hyperkit/"},{"type":"FIX","url":"https://github.com/moby/hyperkit/commit/41272a980197917df8e58ff90642d14dec8fe948"},{"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":"41272a980197917df8e58ff90642d14dec8fe948"}],"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":[{"deprecated":false,"id":"CVE-2021-32845-61f7972e","target":{"function":"pci_vtrnd_notify","file":"src/lib/pci_virtio_rnd.c"},"signature_type":"Function","signature_version":"v1","source":"https://github.com/moby/hyperkit/commit/41272a980197917df8e58ff90642d14dec8fe948","digest":{"function_hash":"310043126656173523047379725801967880239","length":495}},{"deprecated":false,"id":"CVE-2021-32845-ef690adc","target":{"file":"src/lib/pci_virtio_rnd.c"},"signature_type":"Line","signature_version":"v1","source":"https://github.com/moby/hyperkit/commit/41272a980197917df8e58ff90642d14dec8fe948","digest":{"threshold":0.9,"line_hashes":["313427961420582974340249393305992632339","206001336668488359012814060866514161300","256515945538833497297681925219737940193","18215666424238618820492140631593916169","216513535212053987493370348725693915922","755233976114824510165496030115338788","80441343336273934510724666271259445792","339653611464416608273907080567137430736"]}}],"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-32845.json","vanir_signatures_modified":"2026-04-11T17:26:00Z"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}