CVE-2026-57843

Kernel-address disclosure via incorrect PK_KMEM assignment

Published Sep 11, 2026 · Updated Sep 18, 2026

Information disclosure in NetBSD 9.0 through 9.4 and 10.0 through 10.1 allows local users to read kernel virtual addresses. The mm_open() path in sys/dev/mm.c assigns PK_KMEM to processes that open world-accessible /dev/null or /dev/zero, so KERN_PROC sysctl queries bypass CANSEE_KPTR pointer obfuscation. Any unprivileged local account can expose addresses for kernel structures, but the published impact does not include data modification or service interruption.

CVSS severity6.8
Medium
EPSS probability0.14%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in NetBSD 9.0 through 9.4 and 10.0 through 10.1 allows local users to read kernel virtual addresses. The mm_open() path in sys/dev/mm.c assigns PK_KMEM to processes that open world-accessible /dev/null or /dev/zero, so KERN_PROC sysctl queries bypass CANSEE_KPTR pointer obfuscation. Any unprivileged local account can expose addresses for kernel structures, but the published impact does not include data modification or service interruption.

The record

CVE
CVE-2026-57843
Published
Sep 11, 2026
Updated
Sep 18, 2026
Vendor
The NetBSD Foundation
Product
NetBSD
Classifications
CWE-732
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 18, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=10.0 <=10.1
  2. Affected versionversion=9.0 <9.5

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The NetBSD Foundation · NetBSDversion=10.0 <=10.1; version=9.0 <9.5

Published CVSS scores

5.5VulnCheckCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
6.8VulnCheckCVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-732Incorrect Permission Assignment for Critical Resource

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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