CVE-2026-37232
HighCVSS 8.6Exploitation Probability (EPSS)
Low risk32th percentile - higher than 32% of all known CVEs
Summary
OpenAirInterface5G 2.4.0 (nr-softmodem) has a vulnerability in PRB utilization calculation in E2SM-KPM functions. Division by zero when two consecutive total_prb_aggregate samples are identical causes SIGFPE and crashes the nr-softmodem process, leading to 5G service interruption for all connected UEs. No authentication is required.
Risk Assessment
An attacker can cause a complete outage of the 5G base station, denying service to all users in range.
Recommendation
Apply the vendor patch that adds a divisor check before division. Restrict access to port 36422/SCTP to trusted xApps only.
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Original NVD description (English source)
An issue was discovered in OpenAirInterface5G 2.4.0 (nr-softmodem) in the E2SM-KPM RAN Function's PRB utilization metric calculation. The functions fill_RRU_PrbTotDl() and fill_RRU_PrbTotUl() in openair2/E2AP/RAN_FUNCTION/O-RAN/ran_func_kpm_subs.c (lines 182 and 197) compute PRB usage percentages by dividing by the difference of two consecutive total_prb_aggregate samples without checking for zero. When a malicious xApp sends a high volume of E42_RIC_SUBSCRIPTION_REQUESTs via the FlexRIC iApp (port 36422/SCTP), the E2 Agent generates KPM Indication reports at high frequency. If two consecutive sampling intervals yield identical PRB aggregate values, the divisor becomes zero, triggering SIGFPE and crashing the entire 5G base station process (nr-softmodem). This results in complete 5G cell service interruption for all connected UEs. No authentication is required.

