UBUNTU-CVE-2025-38552
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.
02 / AFFECTED SOFTWARE
Affected packages
92 explicit affected versions
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6 explicit affected versions
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10 explicit affected versions
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93 explicit affected versions
10 explicit affected versions
26 explicit affected versions
31 explicit affected versions
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16 explicit affected versions
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3 explicit affected versions
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5 explicit affected versions
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13 explicit affected versions
13 explicit affected versions
7 explicit affected versions
8 explicit affected versions
10 explicit affected versions
12 explicit affected versions
7 explicit affected versions
39 explicit affected versions
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16 explicit affected versions
13 explicit affected versions
26 explicit affected versions
45 explicit affected versions
37 explicit affected versions
42 explicit affected versions
14 explicit affected versions
38 explicit affected versions
9 explicit affected versions
11 explicit affected versions
4 explicit affected versions
30 explicit affected versions
13 explicit affected versions
92 explicit affected versions
8 explicit affected versions
7 explicit affected versions
81 explicit affected versions
1 explicit affected versions
1 explicit affected versions
1 explicit affected versions
91 explicit affected versions
80 explicit affected versions
79 explicit affected versions
13 explicit affected versions
43 explicit affected versions
10 explicit affected versions
8 explicit affected versions
36 explicit affected versions
14 explicit affected versions
4 explicit affected versions
30 explicit affected versions
78 explicit affected versions
11 explicit affected versions
1 explicit affected versions
10 explicit affected versions
80 explicit affected versions
03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
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.
05 / REFERENCES
Further evidence
- https://git.kernel.org/linus/def5b7b2643ebba696fc60ddf675dca13f073486
- https://git.kernel.org/stable/c/659da22dee5ff316ba63bdaeeac7b58b5442f6c2
- https://git.kernel.org/stable/c/7c96d519ee15a130842a6513530b4d20acd2bfcd
- https://git.kernel.org/stable/c/def5b7b2643ebba696fc60ddf675dca13f073486
- https://git.kernel.org/stable/c/f81b6fbe13c7fc413b5158cdffc6a59391a2a8db
- https://ubuntu.com/security/CVE-2025-38552
- https://ubuntu.com/security/notices/USN-7879-1
- https://ubuntu.com/security/notices/USN-7879-2
- https://ubuntu.com/security/notices/USN-7879-3
- https://ubuntu.com/security/notices/USN-7879-4
- https://ubuntu.com/security/notices/USN-7880-1
- https://ubuntu.com/security/notices/USN-7934-1
- https://ubuntu.com/security/notices/USN-8028-1
- https://ubuntu.com/security/notices/USN-8028-2
- https://ubuntu.com/security/notices/USN-8028-3
- https://ubuntu.com/security/notices/USN-8028-4
- https://ubuntu.com/security/notices/USN-8028-5
- https://ubuntu.com/security/notices/USN-8028-6
- https://ubuntu.com/security/notices/USN-8028-7
- https://ubuntu.com/security/notices/USN-8028-8
- https://ubuntu.com/security/notices/USN-8031-1
- https://ubuntu.com/security/notices/USN-8031-2
- https://ubuntu.com/security/notices/USN-8031-3
- https://ubuntu.com/security/notices/USN-8052-1
- https://ubuntu.com/security/notices/USN-8052-2
- https://ubuntu.com/security/notices/USN-8074-1
- https://ubuntu.com/security/notices/USN-8074-2
- https://ubuntu.com/security/notices/USN-8126-1
- https://www.cve.org/CVERecord?id=CVE-2025-38552