Vulnerability · Published Aug 30, 2021 · Assigned by freebsd

CVE-2021-29631

High 7.8

In plain English

A high-severity security flaw in FreeBSD. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 21% of all known vulnerabilities).

Severity (CVSS NVD)7.8High

Exploit odds (30 days)0.3%top 78.8% of all CVEs

Exploited in the wildNo reportsnot in CISA KEV

Attack toolingNoneno public tooling known

Official 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 (as reported)

Vendor	Product	Versions
n/a	FreeBSD	FreeBSD 13.0-RELEASE before p4, 12.2-RELEASE before p10, 11.4-RELEASE before p13

References

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