CVE-2025-23145

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Source
https://cve.org/CVERecord?id=CVE-2025-23145
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-23145.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2025-23145
Downstream
Related
Published
2025-05-01T12:55:34.622Z
Modified
2026-05-28T03:55:50.068399759Z
Summary
mptcp: fix NULL pointer in can_accept_new_subflow
Details

In the Linux kernel, the following vulnerability has been resolved:

mptcp: fix NULL pointer in canacceptnew_subflow

When testing valkey benchmark tool with MPTCP, the kernel panics in 'mptcpcanacceptnewsubflow' because subflow_req->msk is NULL.

Call trace:

mptcpcanacceptnewsubflow (./net/mptcp/subflow.c:63 (discriminator 4)) (P) subflowsynrecvsock (./net/mptcp/subflow.c:854) tcpcheckreq (./net/ipv4/tcpminisocks.c:863) tcpv4rcv (./net/ipv4/tcpipv4.c:2268) ipprotocoldeliverrcu (./net/ipv4/ipinput.c:207) iplocaldeliverfinish (./net/ipv4/ipinput.c:234) iplocaldeliver (./net/ipv4/ipinput.c:254) iprcvfinish (./net/ipv4/ip_input.c:449) ...

According to the debug log, the same req received two SYN-ACK in a very short time, very likely because the client retransmits the syn ack due to multiple reasons.

Even if the packets are transmitted with a relevant time interval, they can be processed by the server on different CPUs concurrently). The 'subflow_req->msk' ownership is transferred to the subflow the first, and there will be a risk of a null pointer dereference here.

This patch fixes this issue by moving the 'subflow_req->msk' under the own_req == true conditional.

Note that the !msk check in subflowhmacvalid() can be dropped, because the same check already exists under the own_req mpj branch where the code has been moved to.

Database specific 
{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/23xxx/CVE-2025-23145.json",
    "cna_assigner": "Linux"
}
References

Affected packages

Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Affected ranges

Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
9466a1ccebbe54ac57fb8a89c2b4b854826546a8
Fixed
8cf7fef1bb2ffea7792bcbf71ca00216cecc725d
Fixed
b3088bd2a6790c8efff139d86d7a9d0b1305977b
Fixed
855bf0aacd51fced11ea9aa0d5101ee0febaeadb
Fixed
7f9ae060ed64aef8f174c5f1ea513825b1be9af1
Fixed
dc81e41a307df523072186b241fa8244fecd7803
Fixed
efd58a8dd9e7a709a90ee486a4247c923d27296f
Fixed
4b2649b9717678aeb097893cc49f59311a1ecab0
Fixed
443041deb5ef6a1289a99ed95015ec7442f141dc

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-23145.json"

Linux / Kernel

Package

Name
Kernel

Affected ranges

Type
ECOSYSTEM
Events
Introduced
5.9.0
Fixed
5.10.237
Type
ECOSYSTEM
Events
Introduced
5.11.0
Fixed
5.15.181
Type
ECOSYSTEM
Events
Introduced
5.16.0
Fixed
6.1.135
Type
ECOSYSTEM
Events
Introduced
6.2.0
Fixed
6.6.88
Type
ECOSYSTEM
Events
Introduced
6.7.0
Fixed
6.12.24
Type
ECOSYSTEM
Events
Introduced
6.13.0
Fixed
6.13.12
Type
ECOSYSTEM
Events
Introduced
6.14.0
Fixed
6.14.3

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-23145.json"