CVE-2025-39990: bpf: Check the helper function is valid in get_helper_proto
CSIRTS triage
- What
- BPF (Berkeley Packet Filter) subsystem does not properly validate helper function validity in get_helper_proto().
- Who is affected
- Systems with BPF enabled and accepting untrusted BPF programs (containers, userspace tracing).
- Urgency
- Medium severity (CVSS 6.2); allows invalid helper function usage which could crash kernel or enable privilege escalation.
- Action
- Update kernel with BPF helper validation fix in get_helper_proto().
AI-assisted analysis generated from the source advisory — verify against the original.
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Details
Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-39990
Exploitation outlook
EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.
- Low exploitation riskCVE-2025-399900.14% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 4% of all EPSS-scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2025-39990 | coverage & exploitation status | NVD · CVE.org |
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