CVE-2026-77237

Medium

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.

SeverityMedium

CVSS6.5

Exploit probability—

ProductAmazon Freertos

PublishedAug 21, 2026

First seenAug 21, 2026

Weakness typeCWE-843CWE-843 CWE-125Out-of-bounds read

How to fix

Update

amazon freertos11.3.1 or later

Patches

github.com/FreeRTOS/FreeRTOS-Kernel/releases/tag/V11.3.1

Vendor advisories

aws.amazon.com/security/security-bulletins/2026-086-aws/

Affected products

Product	Affected versions	Fixed in
amazon freertos	7.4.0 ≤ v < 11.3.1	11.3.1

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