CVE-2026-77234: CWE-863: Incorrect Authorization in FreeRTOS FreeRTOS-Kernel
Description
CVE-2026-77234 is a high-severity vulnerability in FreeRTOS-Kernel versions up to 11.3.0. It involves improper input validation that could allow an unprivileged task on MPU-enabled ports to execute code with privileged kernel context. This issue is resolved in FreeRTOS-Kernel version 11.3.1 and later.
CVSS v3.1
Score 8.8high
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, tracked as CVE-2026-77234 and classified under CWE-863 (Incorrect Authorization), affects FreeRTOS-Kernel versions from 7.0.0 up to and including 11.3.0. The flaw arises from improper input validation, which might allow an unprivileged task running on MPU-enabled ports to escalate privileges and execute code in the privileged kernel context. The vulnerability has a CVSS v3.1 score of 8.8, indicating high severity with impacts on confidentiality, integrity, and availability. The vendor advisory from AWS confirms that upgrading to FreeRTOS-Kernel version 11.3.1 or later remediates the issue.
Potential Impact
Successful exploitation could allow an unprivileged task to execute code with kernel-level privileges, potentially leading to full system compromise including unauthorized access, modification, or disruption of system operations.
Mitigation Recommendations
Users should upgrade FreeRTOS-Kernel to version 11.3.1 or later to remediate this vulnerability. No other mitigations are specified by the vendor advisory. Patch status is confirmed by the AWS security bulletin.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- AMZN
- Date Reserved
- 2026-08-20T18:42:39.352Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Vendor Advisory Urls
- [{"url":"https://aws.amazon.com/security/security-bulletins/2026-086-aws/","vendor":"AWS"}]
Threat ID: 6a88906bacd9273b497ffd54
Added to database: 08/21/2026, 17:52:43 UTC
Last enriched: 09/10/2026, 17:36:17 UTC
Last updated: 10/04/2026, 18:53:18 UTC
Views: 110
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