CVE-2026-77235CWE-416

CVE-2026-77235

High · published August 21, 2026

CVSS v3.1

7.3

EPSS

Percentile

4.5

In the wild

Unconfirmed

What it is

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.

The record

Technical detail

CVSS v3.1: 7.3 · HIGH
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:H
CVSS v4.0: 8.3 · CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:H/SC:N/SI:H/SA:H
EPSS: 0.00157 · 4.5th percentile
Weakness: CWE-416 · Use After Free
Published: 2026-08-21T22:16Z

Affected products (1)

Product	Versions	Fixed in
amazon/freertos	≥ 10.2.0, < 11.3.1	11.3.1

References (3)

https://aws.amazon.com/security/security-bulletins/2026-086-aws/ · ff89ba41-3aa1-4d27-914a-91399e9639e5 https://github.com/FreeRTOS/FreeRTOS-Kernel/releases/tag/V11.3.1 · ff89ba41-3aa1-4d27-914a-91399e9639e5 https://github.com/FreeRTOS/FreeRTOS-Kernel/security/advisories/GHSA-55pf-q87x-c58c · ff89ba41-3aa1-4d27-914a-91399e9639e5

EPSS history

Timeline

21 AUG 17:42Z
Missing privilege check in SecureContext_FreeContext in FreeRTOS-Kernel
cvelistv5