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: 2026-02-09 09:32 UTC (History)
0 users

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:

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System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2026:1727 0 None None None 2026-02-02 15:25:17 UTC
Red Hat Product Errata RHSA-2026:2282 0 None None None 2026-02-09 09:32:00 UTC

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
Comment 3 errata-xmlrpc 2026-02-02 15:25:16 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10.0 Extended Update Support

Via RHSA-2026:1727 https://access.redhat.com/errata/RHSA-2026:1727
Comment 4 errata-xmlrpc 2026-02-09 09:31:59 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:2282 https://access.redhat.com/errata/RHSA-2026:2282
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