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  4. CVE 2026 77234 improper input validation in freertos kernel
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Back to active CVEs
Critical · CVSS 8.8CVE-2026-77234

Improper input validation in FreeRTOS-Kernel timer command handlingCVE-2026-77234

Answer in brief

CVE-2026-77234 records a Critical severity (CVSS 8.8) vulnerability in Improper input validation in FreeRTOS-Kernel timer command handling. The current sources do not mark it as known exploited. The current feed maps FreeRTOS/FreeRTOS-Kernel (generic), FreeRTOS/FreeRTOS-Kernel (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 21, 2026Updated Aug 27, 2026Source checked Oct 6, 2026First seen by HOL Aug 21, 2026Material review Aug 27, 2026
Upstream Advisory

Key facts

Risk
Critical · CVSS 8.8
Exploitation
Not marked as known exploited
Affected software
3 mapped packages or products
Fix availability
Not reported

Why this deserves its current priority

CVSS is 8.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps FreeRTOS/FreeRTOS-Kernel (generic), FreeRTOS/FreeRTOS-Kernel (generic). Check affected ranges and fixed versions before updating.

Affected products and reported versions
ProductAffected versionsFixed versions
cpe:2.3:o:amazon:freertos:*:*:*:*:*:*:*:*Not reportedNot reported
Mapped affected packages and fixed versions
PackageAffected rangeFixed version
FreeRTOS/FreeRTOS-Kernelgeneric7.0.0Not reported
FreeRTOS/FreeRTOS-Kernelgeneric>=7.0.0 <=11.3.0Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for FreeRTOS/FreeRTOS-Kernel, FreeRTOS/FreeRTOS-Kernel.
  2. 2Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

  1. Published upstream

    Aug 21, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Aug 27, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Aug 21, 2026

Sources and claim methodology

  • Source referenceaws.amazon.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
Upstream source description

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.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • PHPGurukul User Registration & Login and User Management System Change Password change-password.php authorizationAlso CWE-863
  • Joplin: Unauthenticated account takeover via an attacker-chosen application-authorisation identifierAlso CWE-863
  • Sssd: sssd: denial of service via memory exhaustion in autofs responderSame generic ecosystem
  • Sssd: sssd: denial of service via unprivileged autofs cache invalidationSame generic ecosystem
  • Sssd: sssd: access control bypass via improper ldap shadow expiration checkSame generic ecosystem
  • Sssd: sssd: denial of service via use-after-free in kcm ticket renewalSame generic ecosystem

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
CWE-863
Source
CVE List V5
Source checked
Oct 6, 2026
References
3 linked sources
Open source record