CVE-2025-38552

Summary

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.

Impact & exploitability

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H

Affected products we track (2)

Recommendation

Apply the vendor fix promptly. Open any affected product above for its exact safe version.

Official patch: https://git.kernel.org/stable/c/659da22dee5ff316ba63bdaeeac7b58b5442f6c2 ↗

Additional information

• NVD record
• https://git.kernel.org/stable/c/659da22dee5ff316ba63bdaeeac7b58b5442f6c2Patch
• https://git.kernel.org/stable/c/7c96d519ee15a130842a6513530b4d20acd2bfcdPatch
• https://git.kernel.org/stable/c/c476d627584b7589a134a8b48dd5c6639e4401c5Patch
• https://git.kernel.org/stable/c/def5b7b2643ebba696fc60ddf675dca13f073486Patch
• https://git.kernel.org/stable/c/f81b6fbe13c7fc413b5158cdffc6a59391a2a8dbPatch
• https://lists.debian.org/debian-lts-announce/2025/10/msg00008.htmlAdvisory
• https://cert-portal.siemens.com/productcert/html/ssa-032379.html