CVE-2026-97524

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.