Bug 2414465 (CVE-2025-40133) - CVE-2025-40133 kernel: mptcp: Use __sk_dst_get() and dst_dev_rcu() in mptcp_active_enable()
Summary: CVE-2025-40133 kernel: mptcp: Use __sk_dst_get() and dst_dev_rcu() in mptcp_a...
Keywords:
Status: NEW
Alias: CVE-2025-40133
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2025-11-12 11:01 UTC by OSIDB Bzimport
Modified: 2025-11-19 19:36 UTC (History)
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Description OSIDB Bzimport 2025-11-12 11:01:24 UTC 
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().
Comment 1 Alexander B 2025-11-13 17:03:07 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025111254-CVE-2025-40133-4d9d@gregkh/T
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