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CVE-2024-35910 is a Linux kernel TCP flaw caused by improper termination of TCP transmit-related timers for kernel sockets during socket teardown. When TCP sockets are closed, the kernel normally calls inet_csk_clear_xmit_timers(), which uses sk_stop_timer()/del_timer(). That only deactivates timers asynchronously and does not guarantee that an already running timer handler has completed. For normal user sockets this is generally safe because the running timer holds a reference to the socket, and the user socket in turn holds a reference to the network namespace. For kernel sockets, however, the socket does not hold a reference to the network namespace, creating a race where TCP timers can still fire after the associated net namespace has already been dismantled and freed. The fix introduces inet_csk_clear_xmit_timers_sync(), which uses sk_stop_timer_sync() so all relevant timers are fully terminated before the kernel socket is released. The issue was observed in code paths involving modules that use kernel sockets and close them from their netns exit handlers.
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Cross-references every affected SKU, including bundled OEM variants.
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