CVE-2025-23145

Published May 1, 2025

Last updated 6 months ago

CVSS medium 5.5

Overview

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.
Source
416baaa9-dc9f-4396-8d5f-8c081fb06d67
NVD status
Analyzed
Products
linux_kernel, debian_linux

Risk scores

CVSS 3.1

Type
Primary
Base score
5.5
Impact score
3.6
Exploitability score
1.8
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Severity
MEDIUM

Weaknesses

nvd@nist.gov
CWE-476

Social media

Hype score
Not currently trending

  1. ⚠️Vulnerabilidades en productos SUSE ❗CVE-2025-23145 ❗CVE-2025-38616 ❗CVE-2025-38500 ➡️Más info: https://t.co/PpGqCkALrI https://t.co/N8cVjib3pK

    @CERTpy

    1 Dec 2025

    85 Impressions

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  2. 🚨 SUSE Linux kernel update alert! 119 CVEs patched, including: CVE-2025-23145 (8.7 CVSS) CVE-2024-58096 (6.9 CVSS) NVMe/BPF/Cloud fixes Patch: zypper in -t patch [ID] Read more:👉 https://t.co/nPG7NGqLl0 #CyberSecurity #DevOps https://t.co/BlYEH3ikvl

    @Cezar_H_Linux

    17 Jun 2025

    60 Impressions

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  3. CVE-2025-23145 Linux Kernel MPTCP NULL Pointer Dereference in Subflow Request Handling https://t.co/7Smv7y41xh

    @VulmonFeeds

    1 May 2025

    15 Impressions

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Configurations

Related CVEs

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References

Sources include official advisories and independent security research.