CVE-2025-40075: tcp_metrics: use dst_dev_net_rcu()
CSIRTS triage
- What
- Network namespace reference handling issue in TCP metrics code.
- Who is affected
- Linux systems with TCP metrics enabled, particularly in container or multi-namespace environments.
- Urgency
- High severity; improper reference counting can lead to use-after-free or denial of service.
- Action
- Update kernel to include the dst_dev_net_rcu() fix in tcp_metrics.
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-2025-40075
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-2025-400750.38% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 31% of all EPSS-scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2025-40075 | coverage & exploitation status | NVD · CVE.org |
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