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Vulnerabilities

Vulnerability · CVE-2026-119086

CVE-2026-119086 - Missing type validation in xQueueSelectFromSet in FreeRTOS-Kernel

Published Oct 30, 2026 · catalog updated Oct 30, 2026 · Amazon Web Services FreeRTOS-Kernel

Last checked Nov 6, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2026-119086. EPSS is 0.15%. Act only if a listed version of Amazon Web Services FreeRTOS-Kernel is installed.

Gaps on this record

  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium6.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.15%
Remediation
Advisory link
Affected products
vendor FreeRTOS FreeRTOS-Kernel

Bulletin ID: 2026-158-AWS Publication Date: 10/30/2026 10:30 AM PDT Description: FreeRTOS-Kernel is a real-time operating system kernel for microcontrollers and small microprocessors, distributed by Amazon. We identified CVE-2026-119086, the queue-set selection path does not fully validate that the referenced kernel object is a queue set before operating on it. On MPU-enabled builds with queue sets enabled, an unprivileged task can cause the kernel to write beyond the intended destination while executing in a privileged context, which affects the integ

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor FreeRTOS FreeRTOS-Kernelversion unspecified

How to fix CVE-2026-119086

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-119086. EPSS is 0.15%. Act only if a listed version of Amazon Web Services FreeRTOS-Kernel is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-121: Stack-based Buffer Overflow; CWE-843: Access of Resource Using Incompatible Type (Type Confusion). EPSS 0.15%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 30, 2026 · AWS Security Bulletins

    Detected

    Bulletin ID: 2026-158-AWS Publication Date: 10/30/2026 10:30 AM PDT Description: FreeRTOS-Kernel is a real-time operating system kernel for microcontrollers and small microprocessors, distributed by Amazon. We identified CVE-2026-119086, the queue-set selection path does not fully validate that the referenced kernel object is a queue set before operating on it. On MPU-enabled builds with queue set

  2. Oct 30, 2026 · CVE.org

    Updated

    Missing queue-set type validation in the queue-set selection system call in FreeRTOS-Kernel before V11.3.3 on MPU-enabled ports with queue sets enabled allows a local unprivileged task to write actor-controlled data beyond a pointer-sized object on the privileged kernel stack, affecting privileged memory across the MPU isolation boundary. To remediate this issue, users should upgrade to FreeRTOS-K

Sources

  • AWS Security BulletinsVendor advisoryCVE-2026-119086

    Read this article

    aws.amazon.com
  • CVE.orgVulnerability recordCVE-2026-119086

    Missing queue-set type validation in the queue-set selection system call in FreeRTOS-Kernel before V11.3.3 on MPU-enabled ports with queue sets enabled allows a local unprivileged task to write actor-controlled data beyond a pointer-sized object on the privileged kernel stack, af

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-119086

    30-day exploitation probability 0.15%

    first.org

References

Freshness

Last verified in this catalog Nov 6, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSNov 6, 2026
  • AWS Security BulletinsNov 6, 2026
  • CVE.orgOct 31, 2026