CVE-2026-19185 Zephyr OS - Broken Access Control

Zephyr OS with CONFIG_USERSPACE enabled contains a kernel memory disclosure and write vulnerability caused by improper validation of per-target data buffers in i3c_do_ccc() syscall, letting unprivileged user threads escalate to supervisor privileges by crafting malicious CCC payloads, exploit requires user-mode access to I3C controller device.

CVSS base score 7.8 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.11% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Broken Access Control
Impact
Privilege Escalation, Information Disclosure, Data Tampering
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published
5 October 2026
Updated
15 October 2026
Weakness
CWE-822

Vendor fix

Update to a Zephyr OS version that includes the fix introducing copy_ccc_and_do() with proper validation and memory copying.

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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