Linux Kernel up to 6.6.100/6.12.39/6.15.7 mptcp state issue

CVSS Meta Temp Score
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CTI Interest Score
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6.1$0-$5k0.00

Summaryinfo

A vulnerability was found in Linux Kernel up to 6.6.100/6.12.39/6.15.7. It has been classified as problematic. The affected element is an unknown function of the component mptcp. The manipulation leads to state issue. This vulnerability is documented as CVE-2025-38552. There is not any exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.6.100/6.12.39/6.15.7. It has been rated as problematic. This issue affects an unknown code block of the component mptcp. The manipulation with an unknown input leads to a state issue vulnerability. Using CWE to declare the problem leads to CWE-371. The impact remains unknown. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: mptcp: plug races between subflow fail and subflow creation We have races similar to the one addressed by the previous patch between subflow failing and additional subflow creation. They are just harder to trigger. The solution is similar. Use a separate flag to track the condition 'socket state prevent any additional subflow creation' protected by the fallback lock. The socket fallback makes such flag true, and also receiving or sending an MP_FAIL option. The field 'allow_infinite_fallback' is now always touched under the relevant lock, we can drop the ONCE annotation on write.

The advisory is shared at git.kernel.org. The identification of this vulnerability is CVE-2025-38552 since 04/16/2025. The exploitation is known to be difficult. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 01/30/2026).

The vulnerability scanner Nessus provides a plugin with the ID 265709 (Debian dsa-6009 : affs-modules-6.1.0-37-4kc-malta-di - security update), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.6.101, 6.12.40 or 6.15.8 eliminates this vulnerability. Applying the patch 7c96d519ee15a130842a6513530b4d20acd2bfcd/f81b6fbe13c7fc413b5158cdffc6a59391a2a8db/659da22dee5ff316ba63bdaeeac7b58b5442f6c2/def5b7b2643ebba696fc60ddf675dca13f073486 is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the databases at Tenable (265709), EUVD (EUVD-2025-25096) and CERT Bund (WID-SEC-2025-1858). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Affected

  • Debian Linux
  • Amazon Linux 2
  • Red Hat Enterprise Linux
  • Ubuntu Linux
  • SUSE Linux
  • Oracle Linux
  • SUSE openSUSE
  • RESF Rocky Linux
  • Dell Avamar
  • Open Source Linux Kernel
  • Dell NetWorker
  • Dell Secure Connect Gateway
  • IBM QRadar SIEM
  • IBM Security Verify Access

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.2
VulDB Meta Temp Score: 6.1

VulDB Base Score: 4.6
VulDB Temp Score: 4.4
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 7.8
NVD Vector: 🔒

CVSSv2info

AVACAuCIA
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: State issue
CWE: CWE-371
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: Partially

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 265709
Nessus Name: Debian dsa-6009 : affs-modules-6.1.0-37-4kc-malta-di - security update

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.6.101/6.12.40/6.15.8
Patch: 7c96d519ee15a130842a6513530b4d20acd2bfcd/f81b6fbe13c7fc413b5158cdffc6a59391a2a8db/659da22dee5ff316ba63bdaeeac7b58b5442f6c2/def5b7b2643ebba696fc60ddf675dca13f073486

Timelineinfo

04/16/2025 CVE reserved
08/16/2025 +122 days Advisory disclosed
08/16/2025 +0 days VulDB entry created
01/30/2026 +167 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2025-38552 (🔒)
GCVE (CVE): GCVE-0-2025-38552
GCVE (VulDB): GCVE-100-320381
EUVD: 🔒
CERT Bund: WID-SEC-2025-1858 - Linux Kernel: Mehrere Schwachstellen

Entryinfo

Created: 08/16/2025 14:36
Updated: 01/30/2026 20:38
Changes: 08/16/2025 14:36 (57), 08/16/2025 15:45 (1), 09/24/2025 08:20 (2), 09/28/2025 10:39 (7), 10/03/2025 17:31 (1), 10/12/2025 21:00 (1), 11/01/2025 23:32 (1), 01/07/2026 20:08 (12), 01/30/2026 20:38 (1)
Complete: 🔍
Cache ID: 216::103

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