CVE-2026-22214: RIOT OS versions up to and including 2026.01-devel-317 contain a stack-based buffer overflow vulnerability in

Q: How do I fix CVE-2026-22214?

riot: upgrade to 2025.10. Exact commands for each OS are on this page.

Q: Is CVE-2026-22214 being exploited?

CVE-2026-22214 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-2026-22214 affect?

CVE-2026-22214 affects riot. Severity is critical (CVSS 9.8). RIOT OS versions up to and including 2026.01-devel-317 contain a stack-based buffer overflow vulnerability in the ethos utility due to missing bounds checking when processing incoming serial frame data. The vulnerability occurs in the _hand

Q: How urgent is CVE-2026-22214?

Priority 49/100. Critical severity; Remotely exploitable, no login, no user action

This month

CRITICAL 9.8REMOTEUPGRADE

CVE-2026-22214 is a critical-severity flaw (CVSS 9.8) affecting riot. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

RIOT OS versions up to and including 2026.01-devel-317 contain a stack-based buffer overflow vulnerability in the ethos utility due to missing bounds checking when processing incoming serial frame data. The vulnerability occurs in the _handle_char() function, where incoming frame bytes are appended to a fixed-size stack buffer without verifying that the current write index remains within bounds. An attacker capable of sending crafted serial or TC

Why this priority

Critical severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.5% (top 60%)
CISA exploited list	No
Weakness	CWE-121
Published	2026-01-12
Last modified	2026-07-14

Publisher (CNA): VulnCheck · Vendor: riot-os

Last updated 2026-07-14 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-01-12 23:15 UTCPublished CVE record published
2026-07-14 16:16 UTCUpdated Record last modified

riot-os riot UPGRADE

Affected: < 2025.10 · 2026.01 devel · 2026.01 rc1

Fixed in: 2025.10

Safe to downgrade to: no unaffected older release

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-2026-22214?

riot: upgrade to 2025.10. Exact commands for each OS are on this page.

Is CVE-2026-22214 being exploited?

CVE-2026-22214 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-2026-22214 affect?

CVE-2026-22214 affects riot. Severity is critical (CVSS 9.8). RIOT OS versions up to and including 2026.01-devel-317 contain a stack-based buffer overflow vulnerability in the ethos utility due to missing bounds checking when processing incoming serial frame data. The vulnerability occurs in the _hand

How urgent is CVE-2026-22214?

Priority 49/100. Critical severity; Remotely exploitable, no login, no user action

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CVE-2026-22213 CRITICAL 9.8 UPGRADE RIOT OS versions up to and including 2026.01-devel-317 contain a stack-based buffer overflow vulnerability in
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References

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