# CVE-2026-57843

## Summary

- **CVE ID:** CVE-2026-57843
- **Severity:** MEDIUM
- **CVSS Score:** 6.8 (CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N)
- **CWE:** CWE-732
- **Published:** Sep 11, 2026
- **Last Modified:** Sep 11, 2026

## Description

NetBSD contains an information disclosure vulnerability in mm_open() within sys/dev/mm.c that allows unprivileged local users to obtain real kernel virtual addresses by opening world-accessible devices such as /dev/null or /dev/zero, which incorrectly receive the PK_KMEM process flag. Attackers can exploit this misconfigured flag to bypass the CANSEE_KPTR obfuscation mechanism and read kernel virtual addresses for sensitive kernel structures including struct proc, kauth_cred, filedesc, and vmspace via sysctl KERN_PROC queries.

## Affected Products

- The NetBSD Foundation — NetBSD (9.0)
- The NetBSD Foundation — NetBSD (10.0)

## References

- [CNA](https://gnats.netbsd.org/60373)
- [CNA](https://www.vulncheck.com/advisories/netbsd-mm-open-pk-kmem-flag-kernel-pointer-information-disclosure)

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-12._