Vulnerability Description
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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Openairinterface | Openairinterface5G | 2.4.0 |
Related Weaknesses (CWE)
References
- https://github.com/MinamiKotor1/oran-security-advisories-zhongnan-luo/blob/main/MitigationThird Party Advisory
- https://gitlab.eurecom.fr/oai/openairinterface5gProduct
FAQ
What is CVE-2026-37232?
CVE-2026-37232 is a vulnerability with a CVSS score of 8.6 (HIGH). 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 opena...
How severe is CVE-2026-37232?
CVE-2026-37232 has been rated HIGH with a CVSS base score of 8.6/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-37232?
Check the references section above for vendor advisories and patch information. Affected products include: Openairinterface Openairinterface5G.