CVE-2025-40133

High

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().

Package Linux Kernel
Published 2025-11-12
Last modified 2026-07-30
CVSS version 3.1
Patch available
Yes

CVSS 3.1 score

8.1

out of 10
High
Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Vector string
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected versions

Linux kernel versions 6.12 and later are affected. Fixed in 6.12.55, 6.17.3, 6.18 and their respective stable series.

Affected from
≥ 6.12
Fixed in
✓ 6.12.55 6.12.x ✓ 6.17.3 6.17.x ✓ 6.18

References

3 total

Frequently asked questions

  • What is CVE-2025-40133?

    CVE-2025-40133 is a High severity Linux kernel vulnerability with a CVSS score of 8.1 out of 10 . It affects Linux kernel versions from 6.12 onward and has been patched in 6.12.55, 6.17.3 and 6.18. CVE-2025-40133 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

  • What is the CVSS score for CVE-2025-40133?

    CVE-2025-40133 has a CVSS score of 8.1 out of 10, rated High severity (CVSS 3.1). The vector string is CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H .

  • Is there a patch available for CVE-2025-40133?

    Yes. CVE-2025-40133 has been patched. Fixed versions include 6.12.55, 6.17.3 and 6.18. If you are running Linux kernel 6.12 or later up to the fix versions, apply the relevant patch for your kernel branch.

  • Is CVE-2025-40133 actively exploited?

    No. CVE-2025-40133 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

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