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CVE-2026-10667— SMP use-after-free in Zephyr `CONFIG_USERSPACE` dynamic kernel-object tracking, reachable from unprivileged user threads

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.

zephyrproject zephyr是zephyrproject组织开源的一款实时操作系统内核。 Zephyr Project Zephyr 1.14.0版本至4.5.0之前版本存在资源管理错误漏洞，该漏洞源于动态内核对象跟踪中的释放后重用问题，在SMP系统中，由于列表遍历和节点释放使用不同的自旋锁，可能导致内核内存损坏，造成权限提升或内核崩溃。

CVSS 7.8 · High EPSS 0.15% · P4

Affected Version Matrix 1

VendorProduct Version RangeStatus
zephyrproject zephyr 1.14.0< 4.5.0 affected
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I. Basic Information for CVE-2026-10667

Vulnerability Information
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Vulnerability Title
SMP use-after-free in Zephyr `CONFIG_USERSPACE` dynamic kernel-object tracking, reachable from unprivileged user threads
Source: CVE Program / CVE List V5
Vulnerability Description
Zephyr's dynamic kernel-object tracking (kernel/userspace/userspace.c, formerly kernel/userspace.c) maintains a doubly-linked list (obj_list) of dynamically allocated kernel objects. Iteration over this list in k_object_wordlist_foreach() was performed under lists_lock using the SAFE iterator (which caches the next node), but list removal and freeing of nodes was performed under different, disjoint spinlocks: objfree_lock in k_object_free() and obj_lock in unref_check(). On an SMP system, while one CPU iterated obj_list under lists_lock, another CPU could unlink and k_free() the dyn_obj node that the iterator had cached as its next pointer, causing the iterator to dereference freed kernel memory (use-after-free / dangling list traversal). All of the racing operations are reachable from unprivileged user-mode threads via system calls: k_object_alloc/k_object_alloc_size and k_object_release drive removals through unref_check() (under obj_lock), while k_thread_abort and thread creation drive the iteration through k_thread_perms_all_clear()/k_thread_perms_inherit() (under lists_lock). A deprivileged user thread on a CONFIG_SMP + CONFIG_USERSPACE build can therefore corrupt the kernel's object-tracking structures across the userspace security boundary, yielding kernel memory corruption (potential privilege escalation) or a kernel crash (denial of service). The fix removes objfree_lock and serializes every obj_list modification under lists_lock, including holding it across find+remove in k_object_free() and around unref_check() in k_thread_perms_clear(). Affects CONFIG_SMP+CONFIG_USERSPACE+CONFIG_DYNAMIC_OBJECTS configurations; the defect dates to the 2019 spinlockification (commit 8a3d57b6cc6, first released in v1.14.0) and shipped through v4.4.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
释放后使用
Source: CVE Program / CVE List V5
Vulnerability Title
Zephyr Project Zephyr 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
zephyrproject zephyr是zephyrproject组织开源的一款实时操作系统内核。 Zephyr Project Zephyr 1.14.0版本至4.5.0之前版本存在资源管理错误漏洞，该漏洞源于动态内核对象跟踪中的释放后重用问题，在SMP系统中，由于列表遍历和节点释放使用不同的自旋锁，可能导致内核内存损坏，造成权限提升或内核崩溃。
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 1.14.0 ~ 4.5.0 -

II. Public POCs for CVE-2026-10667

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III. Intelligence Information for CVE-2026-10667

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Patches & Fixes for CVE-2026-10667 (1)

Vendor Advisories for CVE-2026-10667 (1)

Same Patch Batch · zephyrproject · 2026-07-12 · 6 CVEs total

CVE-2026-10666 8.1 HIGH Stack buffer overflow in `net_ipaddr_parse()` IPv4 address-with-port parsing in `subsys/ne
CVE-2026-10665 7.4 HIGH Heap buffer overflow on WireGuard receive path via unbounded incoming packet length
CVE-2026-10663 6.1 MEDIUM Use-after-free / double-free of the root USB device in the experimental USB host stack
CVE-2026-10664 5.0 MEDIUM Out-of-bounds write in nRF70 Wi-Fi driver power-save event handler (unbounded TWT flow cou
CVE-2026-10668 2.4 LOW Host-triggerable control-endpoint wedge (DoS) in Nuvoton NuMaker HSUSBD UDC driver

IV. Related Vulnerabilities

Same product: zephyr
Same vendor: zephyrproject
Same weakness: CWE-416

V. Comments for CVE-2026-10667

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