CVE-2026-97524
HighCVSS 7.5Summary
In the Linux kernel, the MPTCP receive path can, under unlucky error conditions, recursively call mptcp_data_ready() via a state change and then try to hold the data lock again. The fix breaks this recursion by adding a new flag, exiting early in subflow_state_change(), and flushing the RX queue at reset time.
Risk Assessment
Recursive calls and re-locking can lead to deadlock or incorrect data processing on a dying subflow, causing MPTCP connection instability.
Recommendation
Update the Linux kernel to a version containing the fix that breaks the recursion in the MPTCP receive path and flushes the RX queue on subflow reset.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS