CVE-2025-38552mptcp: plug races between subflow fail and subflow creation
- 9.4CriticalCVSS base score
- 0.35%Exploitation in 30 daysEPSS · top 71% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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.
Timeline
ID reserved
By Linux
- 4 months later
· 4 months later
Published
- 14 months later
· 14 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | Critical9.4 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H |
| NVDNVD · Modified | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.35% · top 71% of all CVEs (12 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: yes · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.4.
Affected products
- affected 478d770008b03ed9d74bdc8add2315b7fd124ecc – < c476d627584b7589a134a8b48dd5c6639e4401c5
- affected 478d770008b03ed9d74bdc8add2315b7fd124ecc – < 7c96d519ee15a130842a6513530b4d20acd2bfcd
- affected 478d770008b03ed9d74bdc8add2315b7fd124ecc – < f81b6fbe13c7fc413b5158cdffc6a59391a2a8db
- affected 478d770008b03ed9d74bdc8add2315b7fd124ecc – < 659da22dee5ff316ba63bdaeeac7b58b5442f6c2
- affected 478d770008b03ed9d74bdc8add2315b7fd124ecc – < def5b7b2643ebba696fc60ddf675dca13f073486
- affected 5.15
- unaffected < 5.15
- unaffected 6.1.149 – ≤ 6.1.*
- unaffected 6.6.101 – ≤ 6.6.*
- unaffected 6.12.40 – ≤ 6.12.*
- unaffected 6.15.8 – ≤ 6.15.*
- unaffected 6.16 – ≤ *
References
References7
- https://git.kernel.org/stable/c/c476d627584b7589a134a8b48dd5c6639e4401c5 (opens in a new tab)
- https://git.kernel.org/stable/c/7c96d519ee15a130842a6513530b4d20acd2bfcd (opens in a new tab)
- https://git.kernel.org/stable/c/f81b6fbe13c7fc413b5158cdffc6a59391a2a8db (opens in a new tab)
- https://git.kernel.org/stable/c/659da22dee5ff316ba63bdaeeac7b58b5442f6c2 (opens in a new tab)
- https://git.kernel.org/stable/c/def5b7b2643ebba696fc60ddf675dca13f073486 (opens in a new tab)
- https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html (opens in a new tab)
- https://cert-portal.siemens.com/productcert/html/ssa-032379.html (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2025-25096 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2025-38552)Record last updated .