by Kastro
Paper/Archive/CVE-2026-77234

CVE-2026-77234

FreeRTOS FreeRTOS-Kernel — Improper input validation in FreeRTOS-Kernel timer command handling

EPSS 0.2%CVSS 9.3
critical.is priorityof 100
29
CVSS 9.3 (CNA)9.3 / 10 × 3027.9Not in CISA KEV+300.0EPSS percentile 6.4.064 × 201.3No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

Improper input validation in FreeRTOS-Kernel before 11.3.1 might allow an unprivileged task on MPU-enabled ports to execute code in privileged kernel context. To remediate this issue, users should upgrade to version 11.3.1 or later.

Affected

ProductAffectedFixed inSource
FreeRTOS-Kernel7.0.0 – 11.3.0–CNA

Scores by source

AMZN (CNA)9.3CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
AMZN (CNA)8.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: total

References

patchgithub.com/FreeRTOS/FreeRTOS-Kernel/releases/tag/V11.3.1advisoryaws.amazon.com/security/security-bulletins/2026-086-awswriteupgithub.com/FreeRTOS/FreeRTOS-Kernel/security/advisories/GHSA-w3vr-pr75-5hc6