CVE-2023-54085
Unknown Unknown - Not Provided

NULL Pointer Dereference in Linux Kernel MPTCP Fastopen Path

Publication date: 2025-12-24

Last updated on: 2025-12-24

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: mptcp: fix NULL pointer dereference on fastopen early fallback In case of early fallback to TCP, subflow_syn_recv_sock() deletes the subflow context before returning the newly allocated sock to the caller. The fastopen path does not cope with the above unconditionally dereferencing the subflow context.

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Meta Information

Published
2025-12-24
Last Modified
2025-12-24
Generated
2026-07-06
AI Q&A
2025-12-24
EPSS Evaluated
2026-07-05
NVD
CVE-2023-54085
EUVD
EUVD-2023-60360

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
linux linux_kernel *

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Exploitability

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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This vulnerability in the Linux kernel's mptcp (Multipath TCP) implementation involves a NULL pointer dereference during the fastopen early fallback process. Specifically, when there is an early fallback to TCP, the function subflow_syn_recv_sock() deletes the subflow context before returning the newly allocated socket to the caller. However, the fastopen path does not handle this properly and unconditionally dereferences the now-deleted subflow context, leading to a NULL pointer dereference.

Impact Analysis

This vulnerability can cause a NULL pointer dereference in the Linux kernel, which may lead to a kernel crash or system instability. This could result in denial of service or unexpected behavior in systems using Multipath TCP with fastopen enabled.

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