Vulnerability in Openairinterface Openairinterface5g
CVE-2026-37232
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.6 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.006 (45.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 46th percentile — 45.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.006 · change: +0.002
Affected products
- Openairinterface Openairinterface5g — versions 2.4.0
Weakness classification (CWE)
References
- gitlab.eurecom.fr/oai/openairinterface5g (Product)
- github.com/MinamiKotor1/oran-security-advisories-zhongnan-luo/blob/main/advisor… (Third Party Advisory, Mitigation)
Frequently asked questions
- What is CVE-2026-37232?
- CVE-2026-37232 is a high-severity vulnerability in Openairinterface Openairinterface5g, classified under Divide By Zero. CVSS score: 8.6/10. Published 2026-06-01.
- How severe is CVE-2026-37232?
- High severity. CVSS v3 base score is 8.6 out of 10.