CVE-2026-46170
MediumCVSS 5.5Exploitation Probability (EPSS)
Low risk2th percentile - higher than 2% of all known CVEs
Summary
A vulnerability has been identified in the Linux kernel within the mptcp module that occurs during the retransmission of ADD_ADDR. The issue involves improper timer management, which can lead to resource blocking.
Risk Assessment
This vulnerability may lead to system hangs, affecting the availability of services within the organization. If exploited, an attacker could cause prolonged downtime.
Recommendation
It is recommended to update the Linux kernel to the latest version where this vulnerability has been fixed. Additionally, monitor systems for unauthorized retransmissions.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: mptcp: pm: ADD_ADDR rtx: free sk if last When an ADD_ADDR is retransmitted, the sk is held in sk_reset_timer(), and released at the end. If at that moment, it was the last reference being held, the sk would not be freed. sock_put() should then be called instead of __sock_put(). But that's not enough: if it is the last reference, sock_put() will call sk_free(), which will end up calling sk_stop_timer_sync() on the same timer, and waiting indefinitely to finish. So it is needed to mark that the timer is done at the end of the timer handler when it has not been rescheduled, not to call sk_stop_timer_sync() on "itself".
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

