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

Q: How do I fix CVE-2026-77237?

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

Q: Is CVE-2026-77237 being exploited?

CVE-2026-77237 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-2026-77237 affect?

CVE-2026-77237 affects freertos. Severity is medium (CVSS 6.5). 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 sh

Q: How urgent is CVE-2026-77237?

Priority 29/100. On your watchlist

Routine

MEDIUM 6.5WATCHLISTUPGRADE

CVE-2026-77237 is a medium-severity flaw (CVSS 6.5) affecting freertos. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.2% (top 93%)
CISA exploited list	No
Weakness	CWE-125, CWE-843
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: >= 7.4.0 and < 11.3.1

Fixed in: 11.3.1

Safe to downgrade to: a release before 7.4.0

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-2026-77237?

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

Is CVE-2026-77237 being exploited?

CVE-2026-77237 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-2026-77237 affect?

CVE-2026-77237 affects freertos. Severity is medium (CVSS 6.5). 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 sh

How urgent is CVE-2026-77237?

Priority 29/100. On your watchlist

Related CVEs

CVE-2026-77234 HIGH 8.8 UPGRADE Improper input validation in FreeRTOS-Kernel before 11.3.1 might allow an unprivileged task on MPU-enabled por
CVE-2026-77235 HIGH 7.3 UPGRADE Missing privilege verification in the secure context cleanup handler in FreeRTOS-Kernel before 11.3.1 might al
CVE-2026-77236 HIGH 7.3 UPGRADE Missing minimum size validation in secure context allocation in FreeRTOS-Kernel before 11.3.1 might allow loca

References

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