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.
Metrics
Affected Vendors & Products
References
History
Thu, 01 Oct 2026 15:30:00 +0000
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| CPEs | cpe:2.3:o:netbsd:netbsd:*:*:*:*:*:*:*:* |
Fri, 18 Sep 2026 21:30:00 +0000
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ssvc
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Sun, 13 Sep 2026 19:30:00 +0000
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| First Time appeared |
Netbsd
Netbsd netbsd |
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| Vendors & Products |
Netbsd
Netbsd netbsd |
Fri, 11 Sep 2026 14:00:00 +0000
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| 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. | |
| Title | NetBSD mm_open() PK_KMEM Flag Kernel Pointer Information Disclosure | |
| Weaknesses | CWE-732 | |
| References |
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| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: VulnCheck
Published: 2026-09-11T13:50:32.448Z
Updated: 2026-10-01T15:20:05.278Z
Reserved: 2026-06-25T18:48:00.281Z
Link: CVE-2026-57843
Updated: 2026-09-18T17:17:16.888Z
Status : Awaiting Analysis
Published: 2026-09-11T14:17:28.067
Modified: 2026-09-24T21:04:40.340
Link: CVE-2026-57843
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