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CVE-2024-27415 is a race condition in the Linux kernel Netfilter bridge path for multicast or broadcast IP packets. Bridge Netfilter can associate an unconfirmed conntrack entry with a packet before bridge processing creates packet clones. In configurations such as a bridge with a macvlan upper-layer path, clones retain references to the same unconfirmed conntrack entry while normal local-in processing may concurrently confirm the original packet. Conntrack confirmation logic cannot safely handle these cloned packets sharing an unconfirmed entry. The upstream fix explicitly confirms the conntrack entry at LOCAL_IN before upper-layer processing can clone it. This approach disables NAT and conntrack helpers for the affected traffic.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
12 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Linux kernel vulnerability covered by the security update.
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.
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.