CVE-2021-32846

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Summary

CVECVE-2021-32846
StatePUBLIC
Assigner[email protected]
Source PriorityCVE Program / NVD first with legacy fallback
Published2023-02-17 23:15:00 UTC
Updated2023-06-26 17:47:00 UTC
DescriptionHyperKit 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.

Risk And Classification

Problem Types: CWE-754

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Mobyproject Hyperkit All All All All

References

ReferenceSourceLinkTags
Fix virtio-sock pci_vtsock_proc_tx uninitialized memory use (GHSL-202… · moby/hyperkit@af5eba2 · GitHub MISC github.com
Various fixes by fredericdalleau · Pull Request #313 · moby/hyperkit · GitHub MISC github.com
GHSL-2021-054_057: Code execution outside the virtualized guest in hyperkit - CVE-2021-32843, CVE-2021-32844, CVE-2021-32845, CVE-2021-32846 | GitHub Security Lab CONFIRM securitylab.github.com
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