CVE-2025-40133
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-11-12

Last updated on: 2025-11-12

Assigner: kernel.org

Description
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().
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Meta Information
Published
2025-11-12
Last Modified
2025-11-12
Generated
2026-06-16
AI Q&A
2025-11-13
EPSS Evaluated
2026-06-15
NVD
CVE-2025-40133
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
linux linux_kernel *
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Exploitability
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CWE ID Description
CWE-UNKNOWN
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Executive Summary

This vulnerability in the Linux kernel involves improper use of certain functions in the mptcp_active_enable() function. Specifically, mptcp_active_enable() uses sk_dst_get(sk)->dev, which can trigger a use-after-free (UAF) condition because it is not always called under Read-Copy-Update (RCU) protection. The fix involves using __sk_dst_get() and dst_dev_rcu() to safely access the destination device, preventing the UAF issue.

Impact Analysis

The vulnerability can lead to a use-after-free condition in the Linux kernel's multipath TCP (mptcp) implementation. This could potentially cause kernel crashes, system instability, or be exploited to execute arbitrary code with kernel privileges, impacting system security and reliability.

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