High severity · published Aug 21, 2026
CVE-2026-77237
Missing type validation in xQueueAddToSet in FreeRTOS-Kernel
8.4
CVSS
0.2%
EPSS
No
On KEV
Description
Missing queue-set type validation in xQueueAddToSet() in the FreeRTOS-Kernel before 11.3.1 might allow an unprivileged task on MPU-enabled ports with configUSE_QUEUE_SETS=1 to read privileged kernel memory. To remediate this issue, users should upgrade to version 11.3.1 or later.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:H
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
None
Availability
High
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 7% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FR
FreeRTOS-Kernel · FreeRTOS
7.4.0 through 11.3.0 · source: vendor
FR
Freertos · Amazon
7.4.0 before 11.3.1 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-77237
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-77237
Vendor Advisory
https://aws.amazon.com/security/security-bulletins/2026-086-aws/
Release Notes
https://github.com/FreeRTOS/FreeRTOS-Kernel/releases/tag/V11.3.1
Vendor Advisory
https://github.com/FreeRTOS/FreeRTOS-Kernel/security/advisories/GHSA-9wvc-hqvx-5wf5
More from FreeRTOS-Kernel
8.8
CVE-2026-109588
Numeric truncation in the MPU buffer authorization check in FreeRTOS-Kernel
8.8
CVE-2026-109587
Incorrect authorization in the Arm Cortex-R82 MPU port in FreeRTOS-Kernel
8.8
CVE-2026-77234
Improper input validation in FreeRTOS-Kernel timer command handling
7.3
CVE-2026-77236
Missing size validation in SecureContext_AllocateContext in FreeRTOS-Kernel
7.3
CVE-2026-77235
Missing privilege check in SecureContext_FreeContext in FreeRTOS-Kernel