CVE-2026-77236: Missing minimum size validation in secure context allocation in FreeRTOS-Kernel before 11.3.1 might allow loca

Q: How do I fix CVE-2026-77236?

freertos: upgrade to 11.3.1. Exact commands for each OS are on this page.

Q: Is CVE-2026-77236 being exploited?

CVE-2026-77236 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-77236 affect?

CVE-2026-77236 affects freertos. Severity is high (CVSS 7.3). Missing minimum size validation in secure context allocation in FreeRTOS-Kernel before 11.3.1 might allow local users to corrupt secure-world heap metadata via an out-of-bounds write with an undersized stack size parameter. To remediate thi

Q: How urgent is CVE-2026-77236?

Priority 32/100. High severity; On your watchlist

Routine

HIGH 7.3WATCHLISTUPGRADE

CVE-2026-77236 is a high-severity flaw (CVSS 7.3) affecting freertos. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Missing minimum size validation in secure context allocation in FreeRTOS-Kernel before 11.3.1 might allow local users to corrupt secure-world heap metadata via an out-of-bounds write with an undersized stack size parameter. To remediate this issue, users should upgrade to version 11.3.1 or later.

Why this priority

High severity
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	7.3 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.2% (top 95%)
CISA exploited list	No
Weakness	CWE-787
Published	2026-08-21
Last modified	2026-10-14

Publisher (CNA): AMZN · Vendor: amazon

Last updated 2026-10-14 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-08-21 18:16 UTCPublished CVE record published
2026-10-14 19:10 UTCUpdated Record last modified

amazon freertos UPGRADE

Affected: >= 10.2.0 and < 11.3.1

Fixed in: 11.3.1

Safe to downgrade to: a release before 10.2.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-77236?

freertos: upgrade to 11.3.1. Exact commands for each OS are on this page.

Is CVE-2026-77236 being exploited?

CVE-2026-77236 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-77236 affect?

CVE-2026-77236 affects freertos. Severity is high (CVSS 7.3). Missing minimum size validation in secure context allocation in FreeRTOS-Kernel before 11.3.1 might allow local users to corrupt secure-world heap metadata via an out-of-bounds write with an undersized stack size parameter. To remediate thi

How urgent is CVE-2026-77236?

Priority 32/100. High severity; On your watchlist

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CVE-2026-77237 MEDIUM 6.5 UPGRADE Missing queue-set type validation in xQueueAddToSet() in the FreeRTOS-Kernel before 11.3.1 might allow an unpr

References

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