CVE-2025-23145

MEDIUM EPSS 6.6%
Published May 1, 20251y ago · Modified Jun 17, 20261w ago
5.5 CVSS 3.1
Medium
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Published May 1, 2025 1y ago
Last Modified Jun 17, 2026 1w ago

Description

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.

CVSS Details

Base Score
5.5
Exploitability
1.8
Impact
3.6
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
6.6% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-476 NULL Pointer Dereference Memory Safety

Affected Products 8

VendorProductVersionRange
linuxlinux_kernel*≥5.9  –  <5.10.237
linuxlinux_kernel*≥5.11  –  <5.15.181
linuxlinux_kernel*≥5.16  –  <6.1.135
linuxlinux_kernel*≥6.2  –  <6.6.88
linuxlinux_kernel*≥6.7  –  <6.12.24
linuxlinux_kernel*≥6.13  –  <6.13.12
linuxlinux_kernel*≥6.14  –  <6.14.3
debiandebian_linux11.0any

References 10

  • git.kernel.org https://git.kernel.org/stable/c/443041deb5ef6a1289a99ed95015ec7442f141dc
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/4b2649b9717678aeb097893cc49f59311a1ecab0
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/7f9ae060ed64aef8f174c5f1ea513825b1be9af1
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/855bf0aacd51fced11ea9aa0d5101ee0febaeadb
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/8cf7fef1bb2ffea7792bcbf71ca00216cecc725d
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/b3088bd2a6790c8efff139d86d7a9d0b1305977b
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/dc81e41a307df523072186b241fa8244fecd7803
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/efd58a8dd9e7a709a90ee486a4247c923d27296f
    Patch
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html
    Mailing List
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html
    Mailing List

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/443041deb5ef6a1289a99ed95015ec7442f141dc
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/4b2649b9717678aeb097893cc49f59311a1ecab0
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/7f9ae060ed64aef8f174c5f1ea513825b1be9af1
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/855bf0aacd51fced11ea9aa0d5101ee0febaeadb
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/8cf7fef1bb2ffea7792bcbf71ca00216cecc725d
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/b3088bd2a6790c8efff139d86d7a9d0b1305977b
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/dc81e41a307df523072186b241fa8244fecd7803
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/efd58a8dd9e7a709a90ee486a4247c923d27296f
    Patch