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CVE-2026-74480 is a stale-pointer vulnerability in the Linux kernel bridge multicast fast-leave path. In br_multicast_leave_group(), deletion of a matching multicast port group by br_multicast_del_pg() does not terminate iteration. The iterator can subsequently advance through the deleted entry’s next pointer and leave the bridge multicast port-group list referencing a deleted object. The condition arises when multicast-to-unicast has allowed multiple port groups for the same bridge port and multicast group, distinguished by source MAC address, and multicast-to-unicast is then disabled such that matching is performed by port only. The upstream correction exits the fast-leave loop immediately after deleting one matching port group.
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21 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A vulnerability referenced in a Red Hat Enterprise Linux 9.6 kernel-package security update; the content provides no technical flaw description.
A Linux kernel networking bridge vulnerability addressed in Red Hat Enterprise Linux 8 kernel packages by RHSA-2026:62372.
A Linux kernel network bridge vulnerability affecting Red Hat Enterprise Linux 9 Real Time Kernel (kernel-rt) packages. The advisory rates the update Important and cites a CVSS v3 network-accessible, low-complexity, no-privileges-required vector with high confidentiality, integrity, and availability impact.
Linux kernel network bridge flaw involving fast-leave handling after deletion of a port group.
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.