Out-of-bounds read in FreeRTOS - CVE-2026-77237
Published: August 25, 2026
Vulnerability identifier: #VU145359
CSH Severity: Low
CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-77237
CWE-ID: CWE-125
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to disclose sensitive information.
The vulnerability exists due to out-of-bounds read in xQueueAddToSet queue-set feature when adding a non-conforming handle to a queue set and performing a later queue-set operation on it. A local user can add a non-conforming handle to a queue set to disclose sensitive information.
Only MPU-enabled builds with queue sets enabled are vulnerable, and the disclosed data is placed into application-readable storage in privileged kernel context.
Affected software
FreeRTOS
How to mitigate CVE-2026-77237
Install security update from vendor's website.
FreeRTOS - update to 11.3.1