CVE-2022-23092: Missing bounds check in 9p message handling

Severity: high (CVSS 8.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.7% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-02-15 · updated 2026-06-17
Weakness: CWE-787

Description

The implementation of lib9p's handling of RWALK messages was missing a bounds check needed when unpacking the message contents. The missing check means that the receipt of a specially crafted message will cause lib9p to overwrite unrelated memory. The bug can be triggered by a malicious bhyve guest kernel to overwrite memory in the bhyve(8) process. This could potentially lead to user-mode code execution on the host, subject to bhyve's Capsicum sandbox.

Affected products

FreeBSD: 13.0-beta1, 13.0-beta2, 13.0-beta3, 13.0-beta3-p1, 13.0-beta4, 13.0-p1 (+19)

References

https://security.freebsd.org/advisories/FreeBSD-SA-22:12.lib9p.asc
https://security.netapp.com/advisory/ntap-20240415-0009/
https://security.freebsd.org/advisories/FreeBSD-SA-22:12.lib9p.asc
https://security.netapp.com/advisory/ntap-20240415-0009/

Get alerted when CVE-2022-23092 or the next vulnerability affects your stack