vulnerability
Red Hat: CVE-2025-40133: kernel: mptcp: Use __sk_dst_get() and dst_dev_rcu() in mptcp_active_enable() (Multiple Advisories)
| Severity | CVSS | Published | Added | Modified |
|---|---|---|---|---|
| 7 | (AV:L/AC:M/Au:S/C:C/I:C/A:C) | Nov 12, 2025 | Feb 4, 2026 | Feb 10, 2026 |
Severity
7
CVSS
(AV:L/AC:M/Au:S/C:C/I:C/A:C)
Published
Nov 12, 2025
Added
Feb 4, 2026
Modified
Feb 10, 2026
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().
Solutions
redhat-upgrade-kernelredhat-upgrade-kernel-rt
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