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CVE-2026-46170 is a Linux kernel vulnerability in the MPTCP path manager ADD_ADDR retransmission handling. During retransmission, the socket object is held in sk_reset_timer() and released at the end of the timer handler. If that release drops the final reference, using __sock_put() prevents proper freeing of the socket. Replacing it with sock_put() is necessary, but doing so exposes a second issue: if sock_put() frees the socket from within the timer handler, sk_free() can invoke sk_stop_timer_sync() on the same timer currently executing, causing the kernel to wait indefinitely on itself. The fix therefore both corrects the reference release path and marks the timer as completed at the end of the handler when it is not rescheduled, preventing self-deadlock.
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No public exploit code observed for this vulnerability.
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2 sources tracked across advisories and community write-ups. News coverage will land here when it surfaces.
No news coverage yet. Advisories and community discussion only.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.