CVE-2026-97524: Linux

High severity, CVSS 7.5. EPSS: 0.7% chance of exploitation in the next 30 days.

In the Linux kernel, the following vulnerability has been resolved: mptcp: avoid unneeded actions on subflow reset Once in a blue moon, the mptcp receive path can recursively call mptcp_data_ready() via state change under unlucky error conditions, and then try to hold the data lock again. Break the recursion loop explicitly checking for the exceptional condition. Add a new flag instead of using an existing one like 'closing', to exit early in subflow_state_change(), and explicitly flush the RX queue at reset time. This avoids unneeded processing to check for available data -- calling get_mapping_status() and more on a dying subflow -- but also in error reporting and worker scheduling. Note that we must consume the currently peeked skb before invoking mptcp_dss_corruption to avoid consuming it again after the eventual reset has freed it.

Affected products

• Linux Linux: from 5.10.228, before 5.10.271 (fixed in 5.10.271); from 5.15.169, before 5.15.222 (fixed in 5.15.222); from 6.1.113, before 6.1.189 (fixed in 6.1.189); from 6.6.57, before 6.6.158 (fixed in 6.6.158); from 6.11.4, before 6.12 (fixed in 6.12); from 6.12, before 6.12.111 (fixed in 6.12.111); …

Published 2026-09-25. Last modified 2026-10-03.