CVE-2026-77235

High

Description

Missing privilege verification in the secure context cleanup handler in FreeRTOS-Kernel before 11.3.1 might allow local users to cause a use-after-free condition in secure-world memory via the SVC handler for secure context deallocation. To remediate this issue, users should upgrade to version 11.3.1 or later.

SeverityHigh

CVSS7.3

Exploit probability—

ProductAmazon Freertos

PublishedAug 21, 2026

First seenAug 21, 2026

Weakness typeCWE-416Use after free

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	10.2.0 ≤ v < 11.3.1	11.3.1

Check your version

Choose the product and enter the version you run to see whether it falls in the affected range.

In the Intelligence 360 plan

Attack Surface Management

See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.