Answer in brief
CVE-2025-40133 records a High severity (CVSS 8.1) vulnerability in mptcp: Use __sk_dst_get() and dst_dev_rcu() in mptcp_active_enable().. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 8.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=27069e7cb3d1cea9377069266acf19b9cc5ad0ae <ad16235c9d3ef7ec17c109ff39b7504f49d17072 || >=27069e7cb3d1cea9377069266acf19b9cc5ad0ae <cc976ec9e38bb79409de3261ba1dbb6868e2a53e || >=27069e7cb3d1cea9377069266acf19b9cc5ad0ae <893c49a78d9f85e4b8081b908fb7c407d018106a | ad16235c9d3ef7ec17c109ff39b7504f49d17072, cc976ec9e38bb79409de3261ba1dbb6868e2a53e, 893c49a78d9f85e4b8081b908fb7c407d018106a |
| Linux/Linuxgeneric | 6.12 | Not reported |
Published upstream
Nov 12, 2025
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
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().
Quoted source text, attributed separately from HOL analysis.