CVE-2023-54085: Linux

High severity, CVSS 7.5. EPSS: 0.4% chance of exploitation in the next 30 days.

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.

Affected products

• Linux Linux: from 6.2, before 6.2.12 (fixed in 6.2.12)

Published 2025-12-24. Last modified 2026-08-04.