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CVE-2026-46319 is a use-after-free race in the Linux kernel net/sched act_ct code path, specifically in tcf_ct_flow_table_get() during flow table lookup and reference acquisition. The vulnerable logic calls rhashtable_lookup_fast() to retrieve a tcf_ct_flow_table (ct_ft) from zones_ht. Although the lookup occurs under an internal RCU read-side critical section, that section is exited before refcount_inc_not_zero(&ct_ft->ref) is attempted. This creates a race window in which another path can drop the last reference, remove the object from the hash table, schedule tcf_ct_flow_table_cleanup_work(), and ultimately free ct_ft via kfree(). If cleanup completes between the lookup return and the refcount increment, the caller dereferences and attempts to reference an already freed ct_ft object, resulting in a kernel use-after-free. The upstream fix is to keep the RCU read lock held until the ct_ft reference is safely acquired.
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