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 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.
CVE-2026-57843
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-57843
NetBSD
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"vendor": "The NetBSD Foundation",
"product": "NetBSD",
"versions": [
{
"status": "affected",
"version": "9.0",
"lessThan": "9.5",
"versionType": "custom"
},
{
"status": "affected",
"version": "10.0",
"versionType": "custom",
"lessThanOrEqual": "10.1"
}
],
"defaultStatus": "unaffected"
}
]- Related CVEs
- CVE-2026-57843
Source reference:
/cveMetadata/cveId
Publisher severity
medium
Source reference: /containers/cna/metrics
- Event
- #5434 · Revision 1
- Added to Heist Feed
- Publisher date