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CVE-2026-12364— Missing user-space pointer validation in logging syscall z_log_msg_static_create allows kernel memory disclosure and denial of service

Quick assessment

Affected
zephyrproject zephyr
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.

Zephyr Project zephyr是Zephyr Project组织开源的一个面向物联网设备的实时操作系统。 Zephyr Project zephyr 2.6.0版本至4.4.2之前版本存在缓冲区错误漏洞，该漏洞源于subsys/logging/log_msg.c中的用户空间系统调用验证器z_vrfy_z_log_msg_static_create()未执行强制安全检查，将调用者提供的source、desc、package和data参数直接传递给内核实现，导致未授权用户线程可利用任意内核地址和长

CVSS 8.4 · High EPSS 0.16% · P4

Affected Version Matrix 1

VendorProduct Version RangeStatus
zephyrproject zephyr 2.6.0< 4.4.2 affected
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I. Basic Information for CVE-2026-12364

Vulnerability Information
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Vulnerability Title
Missing user-space pointer validation in logging syscall z_log_msg_static_create allows kernel memory disclosure and denial of service
Source: CVE Program / CVE List V5
Vulnerability Description
The user-space system-call verifier z_vrfy_z_log_msg_static_create() in subsys/logging/log_msg.c was a pure pass-through: it forwarded the caller-supplied source, desc, package, and data arguments directly to the kernel-mode implementation z_impl_z_log_msg_static_create() without performing any of the mandatory K_SYSCALL_* checks. Because z_log_msg_static_create() is declared __syscall, under CONFIG_USERSPACE any unprivileged user-mode thread can invoke it directly with fully attacker-controlled arguments. The kernel-mode handler dereferences each of these untrusted values: frontend_runtime_filtering() reads through the source pointer as a struct log_source_dynamic_data, cbprintf_package_copy() reads desc.package_len bytes from the package pointer, and z_log_msg_finalize() performs a memcpy() of desc.data_len bytes from the data pointer. With no verification, a user thread can supply arbitrary kernel addresses and arbitrary lengths, and the kernel will read from them. The impact is a kernel-mode denial of service (the kernel faults dereferencing an attacker-chosen pointer) and, where a log backend output is observable to the attacker, disclosure of arbitrary kernel memory copied into the emitted log message — a confidentiality breach across the user/kernel boundary that the userspace sandbox is meant to enforce. The reads do not corrupt kernel memory, so there is no out-of-bounds write primitive. The fix adds the required validation to the verifier: it bounds desc.package_len against Z_LOG_MSG_MAX_PACKAGE, rejects non-NULL/length mismatches, and applies K_SYSCALL_MEMORY_READ() to package, data, and (when runtime filtering with a frontend is enabled) source, so any out-of-bounds or kernel pointer now raises K_OOPS instead of being honored.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
非可信指针解引用
Source: CVE Program / CVE List V5
Vulnerability Title
Zephyr Project zephyr 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Zephyr Project zephyr是Zephyr Project组织开源的一个面向物联网设备的实时操作系统。 Zephyr Project zephyr 2.6.0版本至4.4.2之前版本存在缓冲区错误漏洞，该漏洞源于subsys/logging/log_msg.c中的用户空间系统调用验证器z_vrfy_z_log_msg_static_create()未执行强制安全检查，将调用者提供的source、desc、package和data参数直接传递给内核实现，导致未授权用户线程可利用任意内核地址和长
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
zephyrproject zephyr 2.6.0 ~ 4.4.2 -

II. Public POCs for CVE-2026-12364

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III. Intelligence Information for CVE-2026-12364

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Patches & Fixes for CVE-2026-12364 (1)

Vendor Advisories for CVE-2026-12364 (1)

Same Patch Batch · zephyrproject · 2026-08-14 · 4 CVEs total

CVE-2026-12366 8.8 HIGH Use-after-free freeing an armed dynamically-allocated k_timer in Zephyr userspace object d
CVE-2026-12365 5.8 MEDIUM Use-after-free in Zephyr delayable work-queue cancellation under SMP timing race
CVE-2026-12363 4.2 MEDIUM Out-of-bounds write in LoRaWAN fragmented transport from a fragment index of 0

IV. Related Vulnerabilities

Same product: zephyr
Same vendor: zephyrproject
Same weakness: CWE-822

V. Comments for CVE-2026-12364

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