CVE-2022-23091: Memory disclosure by stale virtual memory mapping

Severity: medium (CVSS 4.0 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% 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-401

Description

A particular case of memory sharing is mishandled in the virtual memory system. This is very similar to SA-21:08.vm, but with a different root cause. An unprivileged local user process can maintain a mapping of a page after it is freed, allowing that process to read private data belonging to other processes or the kernel.

Affected products

FreeBSD: before 12.3; 12.3-beta1, 12.3-p1, 12.3-p2, 12.3-p3, 12.3-p4, 12.3-p5 (+26) — fixed in 12.3

How to fix

Upgrade to a fixed version: FreeBSD 12.3. Check the vendor advisory for mitigations.

References

https://security.freebsd.org/advisories/FreeBSD-SA-22:11.vm.asc
https://security.netapp.com/advisory/ntap-20240415-0008/
https://security.freebsd.org/advisories/FreeBSD-SA-22:11.vm.asc
https://security.netapp.com/advisory/ntap-20240415-0008/

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