CVE-2025-23145 (GCVE-0-2025-23145)

Vulnerability from cvelistv5 – Published: 2025-05-01 12:55 – Updated: 2025-11-03 19:42
VLAI?
Title
mptcp: fix NULL pointer in can_accept_new_subflow
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.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 9466a1ccebbe54ac57fb8a89c2b4b854826546a8 , < 8cf7fef1bb2ffea7792bcbf71ca00216cecc725d (git)
Affected: 9466a1ccebbe54ac57fb8a89c2b4b854826546a8 , < b3088bd2a6790c8efff139d86d7a9d0b1305977b (git)
Affected: 9466a1ccebbe54ac57fb8a89c2b4b854826546a8 , < 855bf0aacd51fced11ea9aa0d5101ee0febaeadb (git)
Affected: 9466a1ccebbe54ac57fb8a89c2b4b854826546a8 , < 7f9ae060ed64aef8f174c5f1ea513825b1be9af1 (git)
Affected: 9466a1ccebbe54ac57fb8a89c2b4b854826546a8 , < dc81e41a307df523072186b241fa8244fecd7803 (git)
Affected: 9466a1ccebbe54ac57fb8a89c2b4b854826546a8 , < efd58a8dd9e7a709a90ee486a4247c923d27296f (git)
Affected: 9466a1ccebbe54ac57fb8a89c2b4b854826546a8 , < 4b2649b9717678aeb097893cc49f59311a1ecab0 (git)
Affected: 9466a1ccebbe54ac57fb8a89c2b4b854826546a8 , < 443041deb5ef6a1289a99ed95015ec7442f141dc (git)
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    Linux Linux Affected: 5.9
Unaffected: 0 , < 5.9 (semver)
Unaffected: 5.10.237 , ≤ 5.10.* (semver)
Unaffected: 5.15.181 , ≤ 5.15.* (semver)
Unaffected: 6.1.135 , ≤ 6.1.* (semver)
Unaffected: 6.6.88 , ≤ 6.6.* (semver)
Unaffected: 6.12.24 , ≤ 6.12.* (semver)
Unaffected: 6.13.12 , ≤ 6.13.* (semver)
Unaffected: 6.14.3 , ≤ 6.14.* (semver)
Unaffected: 6.15 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmptcp: fix NULL pointer in can_accept_new_subflow\n\nWhen testing valkey benchmark tool with MPTCP, the kernel panics in\n\u0027mptcp_can_accept_new_subflow\u0027 because subflow_req-\u003emsk is NULL.\n\nCall trace:\n\n  mptcp_can_accept_new_subflow (./net/mptcp/subflow.c:63 (discriminator 4)) (P)\n  subflow_syn_recv_sock (./net/mptcp/subflow.c:854)\n  tcp_check_req (./net/ipv4/tcp_minisocks.c:863)\n  tcp_v4_rcv (./net/ipv4/tcp_ipv4.c:2268)\n  ip_protocol_deliver_rcu (./net/ipv4/ip_input.c:207)\n  ip_local_deliver_finish (./net/ipv4/ip_input.c:234)\n  ip_local_deliver (./net/ipv4/ip_input.c:254)\n  ip_rcv_finish (./net/ipv4/ip_input.c:449)\n  ...\n\nAccording to the debug log, the same req received two SYN-ACK in a very\nshort time, very likely because the client retransmits the syn ack due\nto multiple reasons.\n\nEven if the packets are transmitted with a relevant time interval, they\ncan be processed by the server on different CPUs concurrently). The\n\u0027subflow_req-\u003emsk\u0027 ownership is transferred to the subflow the first,\nand there will be a risk of a null pointer dereference here.\n\nThis patch fixes this issue by moving the \u0027subflow_req-\u003emsk\u0027 under the\n`own_req == true` conditional.\n\nNote that the !msk check in subflow_hmac_valid() can be dropped, because\nthe same check already exists under the own_req mpj branch where the\ncode has been moved to."
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