CVE-2026-97524

Summary

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 Software

Weaknesses

References

• https://git.kernel.org/stable/c/4b7abdcb5ba832fafab679f0d998af39cbc99307
• https://git.kernel.org/stable/c/b2dbcc1ed48b5ac070a41db4a52aade6823c4df0
• https://git.kernel.org/stable/c/ce7e4ede01ed3e47a48c0f1ce1d87bf4864bee9f
• https://git.kernel.org/stable/c/2b0f561f21b27c40c91ea4975268a06092bd7e9c

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