CVE-2026-57843 — NetBSD mm_open() PK_KMEM Flag Kernel Pointer Information Disclosure
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 …
Published: 2026-09-11 · CVSS: 6.8 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7