CVE-2026-22213

Summary

RIOT OS versions up to and including 2026.01-devel-317 contain a stack-based buffer overflow vulnerability in the tapslip6 utility. The vulnerability is caused by unsafe string concatenation in the devopen() function, which constructs a device path using unbounded user-controlled input. The utility uses strcpy() and strcat() to concatenate the fixed prefix '/dev/' with a user-supplied device name provided via the -s command-line option without bounds checking. This allows an attacker to supply an excessively long device name and overflow a fixed-size stack buffer, leading to process crashes and memory corruption.

Affected Software

Weaknesses

• CWE-121: CWE-121 Stack-based Buffer Overflow

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: poc
  • Automatable: no
  • Technical Impact: partial

References

• https://seclists.org/fulldisclosure/2026/Jan/15
• https://www.riot-os.org/
• https://github.com/RIOT-OS/RIOT
• https://www.vulncheck.com/advisories/riot-os-stack-based-buffer-overflow-in-tapslip6-utility

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