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 TCP-framed input can cause the current write index to exceed the buffer size, resulting in a write past the end of the stack buffer. This condition leads to memory corruption and application crash.
History

Wed, 21 Jan 2026 17:45:00 +0000

Type Values Removed Values Added
CPEs cpe:2.3:o:riot-os:riot:*:*:*:*:*:*:*:*
cpe:2.3:o:riot-os:riot:2026.01:devel:*:*:*:*:*:*
cpe:2.3:o:riot-os:riot:2026.01:rc1:*:*:*:*:*:*
Metrics cvssV3_1

{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}


Tue, 13 Jan 2026 19:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Tue, 13 Jan 2026 09:30:00 +0000

Type Values Removed Values Added
First Time appeared Riot-os
Riot-os riot
Vendors & Products Riot-os
Riot-os riot

Mon, 12 Jan 2026 23:15:00 +0000

Type Values Removed Values Added
Description 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 TCP-framed input can cause the current write index to exceed the buffer size, resulting in a write past the end of the stack buffer. This condition leads to memory corruption and application crash.
Title RIOT OS <= 2026.01-devel-317 Stack-Based Buffer Overflow in ethos Serial Frame Parser
Weaknesses CWE-121
References
Metrics cvssV4_0

{'score': 6.8, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-01-13T18:50:40.171Z

Reserved: 2026-01-06T16:47:17.187Z

Link: CVE-2026-22214

cve-icon Vulnrichment

Updated: 2026-01-13T18:50:37.755Z

cve-icon NVD

Status : Analyzed

Published: 2026-01-12T23:15:52.453

Modified: 2026-01-21T17:43:51.967

Link: CVE-2026-22214

cve-icon Redhat

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