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CVE-2026-57843— NetBSD mm_open() PK_KMEM Flag Kernel Pointer Information Disclosure

Quick assessment

Affected
The NetBSD Foundation NetBSD
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

NetBSD 的 函数（位于 中）存在一个信息泄露漏洞。该漏洞允许无特权的本地用户通过打开全局可访问的设备（如 或 ）来获取真实的内核虚拟地址，因为这些设备被错误地赋予了 进程标志。攻击者可利用这一配置错误的标志位，绕过 地址混淆机制，并通过 的 查询读取包括 、 、 和 等敏感内核结构的内核虚拟地址。

CVSS 5.5 · Medium

Possible ATT&CK Techniques 1 AI

T1059.002 · AppleScript

Affected Version Matrix 2

VendorProduct Version RangeStatus
The NetBSD Foundation NetBSD 9.0< 9.5 affected
10.0≤ 10.1 affected
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I. Basic Information for CVE-2026-57843

Vulnerability Information
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Vulnerability Title
NetBSD mm_open() PK_KMEM Flag Kernel Pointer Information Disclosure
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
关键资源的不正确权限授予
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
The NetBSD Foundation NetBSD 9.0 ~ 9.5 -

II. Public POCs for CVE-2026-57843

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III. Intelligence Information for CVE-2026-57843

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Vendor Advisories for CVE-2026-57843 (2)

IV. Related Vulnerabilities

Same product: NetBSD
Same vendor: The NetBSD Foundation
Same weakness: CWE-732

V. Comments for CVE-2026-57843

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