CVE-2026-106808
UnknownSummary
OpenAirInterface Core Network v2.2.1 has a stack-based buffer overflow in the UDM Nudm_UEAU Generate Authentication Data endpoint. Attacker-controlled resynchronizationInfo.rand and auts values are passed to conv::hex_str_to_uint8(), which converts arbitrary-length hex strings into fixed-size stack buffers without validating the destination size. An authenticated attacker with SBI access and a valid SUPI can submit an oversized value to overwrite adjacent stack memory, corrupt the stack canary, and terminate the UDM process.
Risk Assessment
The vulnerability can allow a remote attacker with SBI access to crash the UDM process, causing denial of service in a 5G network. Stack memory corruption also poses a potential risk for further exploitation.
Recommendation
Update OpenAirInterface Core Network to a patched version or restrict SBI interface access to trusted entities only. Implement input length validation in the UDM endpoint as a temporary mitigation.
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Original NVD description (English source)
OpenAirInterface Core Network v2.2.1 has a stack-based buffer overflow vulnerability in the OAI CN5G UDM Nudm_UEAU Generate Authentication Data endpoint. The UDM passes attacker-controlled resynchronizationInfo.rand and auts values to conv::hex_str_to_uint8(), which converts arbitrary-length hex strings into fixed-size stack buffers without validating the destination size. An unauthenticated attacker with access to the SBI interface and a valid SUPI can submit an oversized value to overwrite adjacent stack memory, corrupt the stack canary, and terminate the UDM process.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS