CVE-2026-37232

Name of the Vulnerable Software and Affected Versions OpenAirInterface5G version 2.4.0

Description An issue exists in the E2SM-KPM RAN Function's PRB utilization metric calculation within the nr-softmodem component. The functions fill RRU PrbTotDl() and fill RRU PrbTotUl() compute PRB usage percentages by dividing by the difference of two consecutive total prb aggregate samples without verifying if the divisor is zero. A malicious xApp can trigger this by sending a high volume of E42 RIC SUBSCRIPTION REQUESTs via the FlexRIC iApp on port 36422/SCTP, causing the E2 Agent to generate KPM Indication reports at a high frequency. If two consecutive sampling intervals produce identical PRB aggregate values, a division by zero occurs, triggering a SIGFPE (floating-point exception) and crashing the 5G base station process. This leads to a complete interruption of 5G cell service for all connected User Equipment (UE). No authentication is required to exploit this issue.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.