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CVE-2024-27415 is a race condition in Linux kernel netfilter bridge handling of multicast and broadcast IP packets. A packet traversing bridge netfilter prerouting can receive a reference to an unconfirmed conntrack entry. When the bridge clones the packet and an upper-layer consumer such as macvlan retains clones for deferred transmission, the cloned sk_buffs share that same unconfirmed conntrack entry. The normal LOCAL_IN conntrack-confirmation path can then race with processing of the retained clone. The affected conntrack confirmation logic cannot safely handle concurrent confirmation involving cloned packets that reference one unconfirmed entry. The upstream fix explicitly confirms the conntrack entry at LOCAL_IN before upper-layer handling can clone it; this behavior disables NAT and conntrack helpers for the affected path.
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No public exploit code observed for this vulnerability.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
9 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Linux kernel netfilter bridge multicast-packet handling flaw.
Linux kernel Netfilter bridge multicast-packet handling flaw.
A Linux kernel netfilter bridge flaw involving confirmation of multicast packets before they are passed up the network stack.
A Linux kernel netfilter bridge flaw involving confirmation of multicast packets before they are passed up the network stack.
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.