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CVE-2026-46319 is a race-condition-driven use-after-free vulnerability in the Linux kernel traffic control connection tracking action implementation in net/sched, specifically in act_ct flow table lookup handling. In tcf_ct_flow_table_get(), a flow table object is retrieved via rhashtable_lookup_fast(), which performs the lookup inside an RCU read-side critical section but releases the RCU read lock before the caller attempts refcount_inc_not_zero() on the returned tcf_ct_flow_table object. This creates a race window in which concurrent cleanup can drop the final reference, remove the object from the hash table, schedule RCU work, and ultimately free the flow table object before the reference increment occurs. If tcf_ct_flow_table_cleanup_work() completes during that interval, the caller dereferences and attempts to reference an already freed object, resulting in a kernel use-after-free. The flaw affects initialization and lookup paths for act_ct flow tables and can be leveraged for kernel memory corruption with potential privilege escalation.
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36 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Linux kernel net/sched act_ct RCU locking flaw involving premature release of an RCU read lock.
A Linux kernel net/sched act_ct vulnerability involving improper RCU read-lock release timing.
Linux kernel netfilter connection-tracking scheduler action flaw involving premature RCU read-lock release.
Linux kernel net/sched act_ct locking flaw involving premature release of an RCU read lock.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.