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().

No CVSS v4.0

Attack Vector Local

Attack Complexity High

Privileges Required Low

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00025.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Linux Linux unaffected
Version Status Constraints
27069e7cb3d1cea9377069266acf19b9cc5ad0ae affected < ad16235c9d3ef7ec17c109ff39b7504f49d17072
27069e7cb3d1cea9377069266acf19b9cc5ad0ae affected < cc976ec9e38bb79409de3261ba1dbb6868e2a53e
27069e7cb3d1cea9377069266acf19b9cc5ad0ae affected < 893c49a78d9f85e4b8081b908fb7c407d018106a
Linux Linux affected
Version Status Constraints
6.12 affected —
0 unaffected < 6.12
6.12.55 unaffected ≤ 6.12.*
6.17.3 unaffected ≤ 6.17.*
6.18 unaffected ≤ *

No data.

No data.

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Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://git.kernel.org/stable/c/893c49a78d9f85e4b8081b908fb7c407d018106a cve-icon cve-icon
https://git.kernel.org/stable/c/ad16235c9d3ef7ec17c109ff39b7504f49d17072 cve-icon cve-icon
https://git.kernel.org/stable/c/cc976ec9e38bb79409de3261ba1dbb6868e2a53e cve-icon cve-icon
https://lore.kernel.org/linux-cve-announce/2025111254-CVE-2025-40133-4d9d@gregkh/T cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2025-40133 cve-icon
https://www.cve.org/CVERecord?id=CVE-2025-40133 cve-icon
History

Mon, 01 Dec 2025 06:30:00 +0000

Type Values Removed Values Added
CPEs cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

Fri, 14 Nov 2025 00:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

 cvssV3_1

{'score': 7.0, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H'}

threat_severity

Important

Wed, 12 Nov 2025 23:00:00 +0000

Type Values Removed Values Added
First Time appeared Linux
Linux linux Kernel
Vendors & Products Linux
Linux linux Kernel

Wed, 12 Nov 2025 10:30:00 +0000

Type Values Removed Values Added
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().
Title mptcp: Use __sk_dst_get() and dst_dev_rcu() in mptcp_active_enable().
References

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published:

Updated: 2025-12-01T06:18:39.687Z

Reserved: 2025-04-16T07:20:57.170Z

Link: CVE-2025-40133

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Awaiting Analysis

Published: 2025-11-12T11:15:42.993

Modified: 2025-11-12T16:19:12.850

Link: CVE-2025-40133

cve-icon Redhat

Severity : Important

Publid Date: 2025-11-12T00:00:00Z

Links: CVE-2025-40133 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2025-11-12T22:12:35Z

Weaknesses

No weakness.