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NVD Vulnerability Details :
CVE-2026-10667
Analyzed
More InfoOfficial Page
Source-vulnerabilities@zephyrproject.org
View Known Exploited Vulnerability (KEV) details
Published At-12 Jul, 2026 | 17:16
Updated At-16 Jul, 2026 | 20:19

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.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary3.17.8HIGH
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
N/A
Type: Secondary
Version: 3.1
Base score: 7.8
Base severity: HIGH
Vector:
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
Type: N/A
Version:
Base score:
Base severity: N/A
Vector:
CPE Matches

Zephyr Project
zephyrproject
>>zephyr>>Versions from 1.14.0(inclusive) to 4.4.1(inclusive)
cpe:2.3:o:zephyrproject:zephyr:*:*:*:*:*:*:*:*
Weaknesses
CWE IDTypeSource
CWE-416Secondaryvulnerabilities@zephyrproject.org
CWE ID: CWE-416
Type: Secondary
Source: vulnerabilities@zephyrproject.org
Evaluator Description

Evaluator Impact

Evaluator Solution

Vendor Statements

References
HyperlinkSourceResource
https://github.com/zephyrproject-rtos/zephyr/commit/fdc42fa256b8c2a7b27790f032d5385f8058c4a9vulnerabilities@zephyrproject.org
Patch
https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-9x5j-h3rh-x579vulnerabilities@zephyrproject.org
Exploit
Patch
Vendor Advisory
https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-9x5j-h3rh-x579134c704f-9b21-4f2e-91b3-4a467353bcc0
Exploit
Patch
Vendor Advisory
Hyperlink: https://github.com/zephyrproject-rtos/zephyr/commit/fdc42fa256b8c2a7b27790f032d5385f8058c4a9
Source: vulnerabilities@zephyrproject.org
Resource:
Patch
Hyperlink: https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-9x5j-h3rh-x579
Source: vulnerabilities@zephyrproject.org
Resource:
Exploit
Patch
Vendor Advisory
Hyperlink: https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-9x5j-h3rh-x579
Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
Resource:
Exploit
Patch
Vendor Advisory
Change History
0Changes found

Details not found