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CVE-2025-23145

mptcp: fix NULL pointer in can_accept_new_subflow

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.237, 5.15.181, 6.1.135, 6.6.88, 6.12.24, and 2 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: yes
  • Technical impact: partial

Summary

In the Linux kernel, the following vulnerability has been resolved: mptcp: fix NULL pointer in can_accept_new_subflow When testing valkey benchmark tool with MPTCP, the kernel panics in 'mptcp_can_accept_new_subflow' because subflow_req->msk is NULL. Call trace: mptcp_can_accept_new_subflow (./net/mptcp/subflow.c:63 (discriminator 4)) (P) subflow_syn_recv_sock (./net/mptcp/subflow.c:854) tcp_check_req (./net/ipv4/tcp_minisocks.c:863) tcp_v4_rcv (./net/ipv4/tcp_ipv4.c:2268) ip_protocol_deliver_rcu (./net/ipv4/ip_input.c:207) ip_local_deliver_finish (./net/ipv4/ip_input.c:234) ip_local_deliver (./net/ipv4/ip_input.c:254) ip_rcv_finish (./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 subflow_hmac_valid() can be dropped, because the same check already exists under the own_req mpj branch where the code has been moved to.

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: yes · Technical impact: partial

  3. Record last updated

Affected versions

  • Linux Linux

    From 9466a1ccebbe54ac57fb8a89c2b4b854826546a8 · fixed in 8cf7fef1bb2ffea7792bcbf71ca00216cecc725d; From 9466a1ccebbe54ac57fb8a89c2b4b854826546a8 · fixed in b3088bd2a6790c8efff139d86d7a9d0b1305977b; From 9466a1ccebbe54ac57fb8a89c2b4b854826546a8 · fixed in 855bf0aacd51fced11ea9aa0d5101ee0febaeadb; From 9466a1ccebbe54ac57fb8a89c2b4b854826546a8 · fixed in 7f9ae060ed64aef8f174c5f1ea513825b1be9af1; From 9466a1ccebbe54ac57fb8a89c2b4b854826546a8 · fixed in dc81e41a307df523072186b241fa8244fecd7803; From 9466a1ccebbe54ac57fb8a89c2b4b854826546a8 · fixed in efd58a8dd9e7a709a90ee486a4247c923d27296f; From 9466a1ccebbe54ac57fb8a89c2b4b854826546a8 · fixed in 4b2649b9717678aeb097893cc49f59311a1ecab0; From 9466a1ccebbe54ac57fb8a89c2b4b854826546a8 · fixed in 443041deb5ef6a1289a99ed95015ec7442f141dc

  • Linux Linux

    5.9

  • KernelLinux

    From 5.9.0 · fixed in 5.10.237; From 5.11.0 · fixed in 5.15.181; From 5.16.0 · fixed in 6.1.135; From 6.2.0 · fixed in 6.6.88; From 6.7.0 · fixed in 6.12.24; From 6.13.0 · fixed in 6.13.12; From 6.14.0 · fixed in 6.14.3

References 8

git.kernel.org