Answer in brief
CVE-2025-38552 records a Unknown severity vulnerability in mptcp: plug races between subflow fail and subflow creation. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC CN 4100 (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
Answer in brief
CVE-2025-38552 records a Unknown severity vulnerability in mptcp: plug races between subflow fail and subflow creation. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC CN 4100 (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC CN 4100 (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=478d770008b03ed9d74bdc8add2315b7fd124ecc <c476d627584b7589a134a8b48dd5c6639e4401c5 || >=478d770008b03ed9d74bdc8add2315b7fd124ecc <7c96d519ee15a130842a6513530b4d20acd2bfcd || >=478d770008b03ed9d74bdc8add2315b7fd124ecc <f81b6fbe13c7fc413b5158cdffc6a59391a2a8db || >=478d770008b03ed9d74bdc8add2315b7fd124ecc <659da22dee5ff316ba63bdaeeac7b58b5442f6c2 || >=478d770008b03ed9d74bdc8add2315b7fd124ecc <def5b7b2643ebba696fc60ddf675dca13f073486 | c476d627584b7589a134a8b48dd5c6639e4401c5, 7c96d519ee15a130842a6513530b4d20acd2bfcd, f81b6fbe13c7fc413b5158cdffc6a59391a2a8db, 659da22dee5ff316ba63bdaeeac7b58b5442f6c2, def5b7b2643ebba696fc60ddf675dca13f073486 |
| Linux/Linuxgeneric | 5.15 | Not reported |
| Siemens/SIMATIC CN 4100generic | >=0 <V5.0 | V5.0 |
Published upstream
Aug 16, 2025
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
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.
Quoted source text, attributed separately from HOL analysis.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC CN 4100 (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=478d770008b03ed9d74bdc8add2315b7fd124ecc <c476d627584b7589a134a8b48dd5c6639e4401c5 || >=478d770008b03ed9d74bdc8add2315b7fd124ecc <7c96d519ee15a130842a6513530b4d20acd2bfcd || >=478d770008b03ed9d74bdc8add2315b7fd124ecc <f81b6fbe13c7fc413b5158cdffc6a59391a2a8db || >=478d770008b03ed9d74bdc8add2315b7fd124ecc <659da22dee5ff316ba63bdaeeac7b58b5442f6c2 || >=478d770008b03ed9d74bdc8add2315b7fd124ecc <def5b7b2643ebba696fc60ddf675dca13f073486 | c476d627584b7589a134a8b48dd5c6639e4401c5, 7c96d519ee15a130842a6513530b4d20acd2bfcd, f81b6fbe13c7fc413b5158cdffc6a59391a2a8db, 659da22dee5ff316ba63bdaeeac7b58b5442f6c2, def5b7b2643ebba696fc60ddf675dca13f073486 |
| Linux/Linuxgeneric | 5.15 | Not reported |
| Siemens/SIMATIC CN 4100generic | >=0 <V5.0 | V5.0 |
Published upstream
Aug 16, 2025
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
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.
Quoted source text, attributed separately from HOL analysis.