What is CVE-2025-40133?

CVE-2025-40133 is a high-severity vulnerability in Linux. CVSS score: 8.1/10. Published 2025-11-12.

How severe is CVE-2025-40133?

High severity. CVSS v3 base score is 8.1 out of 10.

Vulnerability in Linux

CVE-2025-40133

In the Linux kernel, the following vulnerability has been resolved: mptcp: Use __sk_dst_get() and dst_dev_rcu() in mptcp_active_enable(). mptcp_active_enable() is called from subflow_finish_connect(), which is icsk->icsk_af_ops->sk_rx_dst_set() and it's not always under RCU. Using sk_dst_get(sk)->dev could trigger UAF. Let's use __sk_dst_get() and dst_dev_rcu().

EPSS: 0.005 (39.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Linux — versions 27069e7cb3d1cea9377069266acf19b9cc5ad0ae, 6.12, 0

References

416baaa9-dc9f-4396-8d5f-8c081fb06d67
416baaa9-dc9f-4396-8d5f-8c081fb06d67
416baaa9-dc9f-4396-8d5f-8c081fb06d67

Frequently asked questions

What is CVE-2025-40133?: CVE-2025-40133 is a high-severity vulnerability in Linux. CVSS score: 8.1/10. Published 2025-11-12.
How severe is CVE-2025-40133?: High severity. CVSS v3 base score is 8.1 out of 10.