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Review reviewHigh

CVE-2025-38552

Linux Linux, SIMATIC CN 4100, linux kernel

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...

CVSS
7.8
EPSS
0.31%
22.9% percentile
CISA KEV
Not listed
Published
2025.08.16
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.31%
Technical severityCVSS 7.8

Vulnerability overview

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...

Affected product and versions

Product
Linux Linux, SIMATIC CN 4100, linux kernel
Affected versions
>= 478d770008b03ed9d74bdc8add2315b7fd124ecc < c476d627584b7589a134a8b48dd5c6639e4401c5, >= 478d770008b03ed9d74bdc8add2315b7fd124ecc < 7c96d519ee15a130842a6513530b4d20acd2bfcd, >= 478d770008b03ed9d74bdc8add2315b7fd124ecc < f81b6fbe13c7fc413b5158cdffc6a59391a2a8db, >= 478d770008b03ed9d74bdc8add2315b7fd124ecc < 659da22dee5ff316ba63bdaeeac7b58b5442f6c2, >= 478d770008b03ed9d74bdc8add2315b7fd124ecc < def5b7b2643ebba696fc60ddf675dca13f073486, >= 5.15, < V5.0, >= 5.15 < 6.1.149, >= 6.2 < 6.6.101, >= 6.7 < 6.12.40, >= 6.13 < 6.15.8, 6.16, 11.0
Fixed versions
6.1.149, 6.6.101, 6.12.40, 6.15.8

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux Linux, SIMATIC CN 4100, linux kernel and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
Not available
CVE-2025-38552 — Linux Linux, SIMATIC CN 4100, linux kernel | SECUFOCUS NOW