CVE-2021-32846
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`.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.32%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
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.
- CVSS 3.1
- 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.32% probability · 25th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-908, CWE-754
- Affected
- mobyproject/hyperkit
- Source
- security-advisories@github.com
References
- https://github.com/moby/hyperkit/commit/af5eba2360a7351c08dfd9767d9be863a50ebabaPatch
- https://github.com/moby/hyperkit/pull/313Patch
- https://securitylab.github.com/advisories/GHSL-2021-054_057-moby-hyperkit/Third Party Advisory
- https://github.com/moby/hyperkit/commit/af5eba2360a7351c08dfd9767d9be863a50ebabaPatch
- https://github.com/moby/hyperkit/pull/313Patch
- https://securitylab.github.com/advisories/GHSL-2021-054_057-moby-hyperkit/Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.