CVE-2025-38552 Details
Description
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.
A race condition vulnerability has been identified in the Linux kernel's Multipath TCP (MPTCP) implementation, specifically within the subflow management. This vulnerability arises from a timing issue between the failure of a subflow and the creation of new subflows, which can lead to improper handling of subflow states. The problem is particularly related to the 'allow_infinite_fallback' flag, which controls the creation of new subflows. When a subflow fails, this flag needs to be managed carefully to prevent additional subflows from being created prematurely. The vulnerability affects several versions of the Linux kernel.
The vulnerability has been addressed in the Linux kernel by introducing a separate flag to track the socket state and prevent additional subflow creation, ensuring that this management is protected by the appropriate locks. Users should upgrade to the latest version of the Linux kernel where this patch has been applied.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
No SSVC data is available for this CVE.
References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://cert-portal.siemens.com/productcert/html/ssa-032379.html | siemens-SADP | |
| https://git.kernel.org/stable/c/659da22dee5ff316ba63bdaeeac7b58b5442f6c2 | kernel.org | Patch |
| https://git.kernel.org/stable/c/7c96d519ee15a130842a6513530b4d20acd2bfcd | kernel.org | Patch |
| https://git.kernel.org/stable/c/c476d627584b7589a134a8b48dd5c6639e4401c5 | kernel.org | Patch |
| https://git.kernel.org/stable/c/def5b7b2643ebba696fc60ddf675dca13f073486 | kernel.org | Patch |
| https://git.kernel.org/stable/c/f81b6fbe13c7fc413b5158cdffc6a59391a2a8db | kernel.org | Patch |
| https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html | CVE | Mailing ListThird Party Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| NVD-CWE-noinfo | Insufficient Information to Classify Weakness | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| linux linux kernel | >= 5.15, < 6.1.149 >= 6.2, < 6.6.101 >= 6.7, < 6.12.40 >= 6.13, < 6.15.8 6.16 rc1 6.16 rc2 6.16 rc3 6.16 rc4 6.16 rc5 6.16 rc6 |
CPE
Remediation
| |
| debian debian linux | 11.0 |
CPE
Remediation
| |
Change History
8 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 30, 2026 | CVE Modified | kernel.org |
| Jun 17, 2026 | CVE Modified | kernel.org |
| Jun 17, 2026 | CVE Modified | siemens-SADP |
| May 12, 2026 | CVE Modified | siemens-SADP |
| Jan 7, 2026 | Initial Analysis | [email protected] |
| Nov 3, 2025 | CVE Modified | CVE |
| Aug 28, 2025 | CVE Modified | kernel.org |
| Aug 16, 2025 | New CVE Received | kernel.org |