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CVE-2023-53365 is an integer-underflow vulnerability in the Linux kernel IPv6 multicast-routing implementation. In an affected VLAN configuration on the IPv6 PIM register interface, Duplicate Address Detection traffic can traverse reg_vif_xmit() and invoke ip6mr_cache_report(). That function passes the negated packet network offset to skb_push(). Because skb_push() accepts an unsigned length, a negative offset is converted to a very large unsigned value, moving the skb data pointer outside its valid buffer range. The resulting skb_under_panic condition triggers a kernel BUG.
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19 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Linux kernel IPv6 multicast-routing flaw that can trigger an skb_under_panic condition in ip6mr_cache_report().
Linux kernel IPv6 multicast-routing flaw that can trigger skb_under_panic in ip6mr_cache_report().
Linux kernel IPv6 multicast-routing flaw that can trigger skb_under_panic in ip6mr_cache_report().
Linux kernel IPv6 multicast-routing flaw that can trigger skb_under_panic in ip6mr_cache_report().
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.