CVE-2026-12364

Kernel memory disclosure and crash via unchecked pointers

Published Aug 14, 2026 · Updated Aug 14, 2026

Untrusted pointer dereference in Zephyr RTOS 2.6.0 through 4.4.1 allows local users to read kernel memory or crash the kernel. The z_vrfy_z_log_msg_static_create() verifier passes attacker-controlled source, package, data, and length values into kernel code without K_SYSCALL_* validation, where logging routines dereference or copy from those addresses. Exploitation requires an unprivileged user-mode thread in a build with CONFIG_USERSPACE and CONFIG_LOG; disclosure additionally requires an attacker-observable log backend, while invalid addresses cause a kernel fault.

CVSS severity8.4
High
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Untrusted pointer dereference in Zephyr RTOS 2.6.0 through 4.4.1 allows local users to read kernel memory or crash the kernel. The z_vrfy_z_log_msg_static_create() verifier passes attacker-controlled source, package, data, and length values into kernel code without K_SYSCALL_* validation, where logging routines dereference or copy from those addresses. Exploitation requires an unprivileged user-mode thread in a build with CONFIG_USERSPACE and CONFIG_LOG; disclosure additionally requires an attacker-observable log backend, while invalid addresses cause a kernel fault.

The record

CVE
CVE-2026-12364
Published
Aug 14, 2026
Updated
Aug 14, 2026
Vendor
Zephyr Project
Product
Zephyr RTOS
Classifications
CWE-822, T1499.004, T1005
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 14, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 14, 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=2.6.0 <4.4.2

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Zephyr Project · Zephyr RTOSversion=2.6.0 <4.4.2

Published CVSS scores

8.4Zephyr ProjectCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:H

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.

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

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-822Untrusted Pointer Dereference
T1499.004Application or System Exploitation
T1005Data from Local System

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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Your stack

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