CVE-2021-29631

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-08-30 · updated 2026-06-17
Weakness: CWE-908

Description

In FreeBSD 13.0-STABLE before n246941-20f96f215562, 12.2-STABLE before r370400, 11.4-STABLE before r370399, 13.0-RELEASE before p4, 12.2-RELEASE before p10, and 11.4-RELEASE before p13, certain VirtIO-based device models in bhyve failed to handle errors when fetching I/O descriptors. A malicious guest may cause the device model to operate on uninitialized I/O vectors leading to memory corruption, crashing of the bhyve process, and possibly arbitrary code execution in the bhyve process.

Affected products

FreeBSD: 11.4, 11.4-p1, 11.4-p10, 11.4-p11, 11.4-p12, 11.4-p13 (+23)

References

https://security.FreeBSD.org/advisories/FreeBSD-SA-21:13.bhyve.asc
https://security.netapp.com/advisory/ntap-20210923-0004/
https://security.FreeBSD.org/advisories/FreeBSD-SA-21:13.bhyve.asc
https://security.netapp.com/advisory/ntap-20210923-0004/

Get alerted when CVE-2021-29631 or the next vulnerability affects your stack