CVE-2026-19569 Zephyr Kernel - Buffer Overflow

Zephyr kernel with CONFIG_USERSPACE and CONFIG_DYNAMIC_OBJECTS contains a buffer overflow caused by unchecked unsigned integer wrap-around in dynamic_object_create() size calculations, letting unprivileged user-mode threads perform out-of-bounds writes to kernel heap, exploit requires CONFIG_USERSPACE, CONFIG_DYNAMIC_OBJECTS, and a thread with assigned resource pool.

CVSS base score 8.8 /10
High
CISA KEV
Not listed
Public exploit
None known
EPSS
0.12% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Buffer Overflow
Impact
Remote Code Execution, Data Tampering
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Published
9 October 2026
Updated
15 October 2026
Weakness
CWE-190

Vendor fix

Update to a version that rejects overflowing size computations and frees partially built descriptors; otherwise, upgrade to the latest Zephyr version.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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