CVE-2026-77236: CWE-787 Out-of-bounds write in FreeRTOS FreeRTOS-Kernel
Description
Missing minimum size validation in secure context allocation in FreeRTOS-Kernel before 11.3.1 might allow local users to corrupt secure-world heap metadata via an out-of-bounds write with an undersized stack size parameter. To remediate this issue, users should upgrade to version 11.3.1 or later.
CVSS v3.1
Score 7.3high
Affected software
FreeRTOS
FreeRTOS-Kernel
pkg:github/freertos/FreeRTOS-KernelRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CWE-787) in FreeRTOS-Kernel prior to 11.3.1 arises from missing minimum size validation in the secure context allocation function. A local user can supply an undersized stack size parameter, causing an out-of-bounds write that corrupts secure-world heap metadata. The corruption can impact system availability, as indicated by the CVSS vector. The vulnerability is addressed by upgrading to version 11.3.1 or later.
Potential Impact
The vulnerability allows local attackers with limited privileges to corrupt secure-world heap metadata via an out-of-bounds write. This can lead to denial of service or other availability impacts. There is no indication of confidentiality or integrity loss beyond the heap metadata corruption. No known exploits are reported in the wild at this time.
Mitigation Recommendations
Users should upgrade FreeRTOS-Kernel to version 11.3.1 or later to remediate this vulnerability. Patch status is not explicitly confirmed in the vendor advisory, but the description clearly states that upgrading to 11.3.1 or later fixes the issue. No additional mitigations are specified.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- AMZN
- Date Reserved
- 2026-08-20T18:42:40.136Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Vendor Advisory Urls
- [{"url":"https://aws.amazon.com/security/security-bulletins/2026-086-aws/","vendor":"AWS"}]
Threat ID: 6a88906bacd9273b497ffd59
Added to database: 08/21/2026, 17:52:43 UTC
Last enriched: 08/21/2026, 18:07:33 UTC
Last updated: 10/05/2026, 18:48:22 UTC
Views: 72
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