{"id":"CVE-2021-32846","details":"HyperKit is a toolkit for embedding hypervisor capabilities in an application. In versions 0.20210107, function `pci_vtsock_proc_tx` in `virtio-sock` can lead to to uninitialized memory use. In this situation, there is a check for the return value to be less or equal to `VTSOCK_MAXSEGS`, but that check is not sufficient because the function can return `-1` if it finds an error it cannot recover from. Moreover, the negative return value will be used by `iovec_pull` in a while condition that can further lead to more corruption because the function is not designed to handle a negative `iov_len`. 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 af5eba2360a7351c08dfd9767d9be863a50ebaba.","modified":"2026-05-17T11:55:17.457275281Z","published":"2023-02-17T23:15:12.037Z","database_specific":{},"references":[{"type":"ADVISORY","url":"https://securitylab.github.com/advisories/GHSL-2021-054_057-moby-hyperkit/"},{"type":"FIX","url":"https://github.com/moby/hyperkit/commit/af5eba2360a7351c08dfd9767d9be863a50ebaba"},{"type":"FIX","url":"https://github.com/moby/hyperkit/pull/313"}],"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"}]}