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PatchSiren cyber security CVE debrief

CVE-2026-22214 RIOT CVE debrief

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. This condition leads to memory corruption and application crash. Users of affected versions should review and apply vendor-provided patches or updates.

Vendor
RIOT
Product
RIOT OS
CVSS
MEDIUM 6.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-01-12
Original CVE updated
2026-07-14
Advisory published
2026-01-12
Advisory updated
2026-07-14

Who should care

Users of RIOT OS versions up to and including 2026.01-devel-317 should be aware of this vulnerability and take steps to mitigate it. This includes reviewing and applying vendor-provided patches or updates. Operators, platform administrators, vulnerability management teams, and security teams should review the vulnerability details and assess their exposure.

Technical summary

The vulnerability occurs in the _handle_char() function of the ethos utility, where incoming frame bytes are appended to a fixed-size stack buffer without bounds checking. An attacker capable of sending crafted serial or TCP-framed input can cause a write past the end of the stack buffer, leading to memory corruption and application crash. This could allow an attacker to cause a denial of service or potentially execute arbitrary code. The affected product is RIOT OS versions up to and including 2026.01-devel-317.

Defensive priority

Medium priority should be given to patching or mitigating this vulnerability, as it could allow an attacker to cause a denial of service or potentially execute arbitrary code.

Recommended defensive actions

  • Apply vendor-provided patches or updates to RIOT OS versions up to and including 2026.01-devel-317.
  • Review and implement secure coding practices to prevent similar vulnerabilities in the future.
  • Monitor systems for potential exploitation attempts.
  • Review compensating controls for exposed systems while remediation is scheduled and verified.
  • Check relevant monitoring, detection, and logs for exposed assets that need extra review.
  • Track exceptions, retest remediated assets, and close the item only after evidence is documented.
  • Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.

Evidence notes

The CVE record was published on 2026-01-12T23:15:52.453Z and was last modified on 2026-07-14T16:16:49.483Z. The NVD entry is currently Analyzed. This information is based on the NVD entry and the CVE record. The vulnerability affects RIOT OS versions up to and including 2026.01-devel-317. The evidence is limited to publicly available information from the CVE record and NVD entry.

Official resources

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-01-12T23:15:52.453Z and has not been modified since then. The NVD entry is currently Analyzed.