CVE-2026-57843
NetBSD mm_open() PK_KMEM Flag Kernel Pointer Information Disclosure
CVSS Score
5.5
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-732 |
| Vendor | the netbsd foundation |
| Product | netbsd |
| Published | Sep 11, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None
Affected Versions
The NetBSD Foundation / NetBSD
9.0 < 9.5 10.0 ≤ 10.1
References
Credits
Tristan CLERC VulnCheck