CVE-2026-77237: CWE-843 Access of resource using incompatible type ('type confusion') in FreeRTOS FreeRTOS-Kernel
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.
AI Analysis
Technical Summary
The vulnerability arises from missing validation of queue-set types in the xQueueAddToSet() function of FreeRTOS-Kernel versions prior to 11.3.1. This flaw can be exploited by an unprivileged task running on MPU-enabled ports with configUSE_QUEUE_SETS=1 enabled, potentially allowing it to read privileged kernel memory. The issue is classified under CWE-843 (Access of resource using incompatible type) and CWE-125 (Out-of-bounds read). The vulnerability has a CVSS 3.1 base score of 6.5, indicating medium severity, with an attack vector requiring local access and low complexity, and it impacts confidentiality but not integrity or availability. Users are advised to upgrade to FreeRTOS-Kernel version 11.3.1 or later to remediate the issue.
Potential Impact
An unprivileged task on MPU-enabled ports with configUSE_QUEUE_SETS=1 may read privileged kernel memory due to missing type validation in xQueueAddToSet(). This compromises confidentiality of kernel memory but does not affect integrity or availability. The attack requires local access with low complexity and no user interaction.
Mitigation Recommendations
Upgrade FreeRTOS-Kernel to version 11.3.1 or later, where this vulnerability is fixed. Patch status is confirmed by the vendor advisory. No other mitigations are specified.
CVE-2026-77237: CWE-843 Access of resource using incompatible type ('type confusion') in FreeRTOS FreeRTOS-Kernel
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.
CVSS v3.1
Score 6.5medium
Affected software
pkg:github/freertos/FreeRTOS-KernelRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability arises from missing validation of queue-set types in the xQueueAddToSet() function of FreeRTOS-Kernel versions prior to 11.3.1. This flaw can be exploited by an unprivileged task running on MPU-enabled ports with configUSE_QUEUE_SETS=1 enabled, potentially allowing it to read privileged kernel memory. The issue is classified under CWE-843 (Access of resource using incompatible type) and CWE-125 (Out-of-bounds read). The vulnerability has a CVSS 3.1 base score of 6.5, indicating medium severity, with an attack vector requiring local access and low complexity, and it impacts confidentiality but not integrity or availability. Users are advised to upgrade to FreeRTOS-Kernel version 11.3.1 or later to remediate the issue.
Potential Impact
An unprivileged task on MPU-enabled ports with configUSE_QUEUE_SETS=1 may read privileged kernel memory due to missing type validation in xQueueAddToSet(). This compromises confidentiality of kernel memory but does not affect integrity or availability. The attack requires local access with low complexity and no user interaction.
Mitigation Recommendations
Upgrade FreeRTOS-Kernel to version 11.3.1 or later, where this vulnerability is fixed. Patch status is confirmed by the vendor advisory. No other mitigations are specified.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- AMZN
- Date Reserved
- 2026-08-20T18:42:40.533Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
- Vendor Advisory Urls
- [{"url":"https://aws.amazon.com/security/security-bulletins/2026-086-aws/","vendor":"AWS"}]
Threat ID: 6a8893f9acd9273b4983fd54
Added to database: 08/21/2026, 18:07:53 UTC
Last enriched: 08/21/2026, 18:22:23 UTC
Last updated: 08/21/2026, 20:22:58 UTC
Views: 7
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