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CVE-2024-26837 is a race condition in the Linux kernel bridge switchdev multicast database (MDB) offload path. While constructing an MDB replay list, the bridge could concurrently create a new multicast membership through IGMP/MLD snooping or administrative configuration. The new membership was immediately visible in the bridge MDB list, but its switchdev notification could still be queued for deferred delivery. A replay generated during this interval could therefore duplicate the pending membership-addition notification. Hardware-offload drivers that reference-count MDB memberships, including DSA drivers, could retain an unmatched reference because bridge destruction emits only one deletion notification. The fix serializes replay-list generation with the MDB write-side lock and excludes additions already queued for deferred switchdev notification.
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A Linux kernel networking bridge/switchdev flaw involving multicast database replay handling for deferred offload events.
A medium-severity Linux kernel bridge/switchdev vulnerability concerning replay of multicast database (MDB) deferred events during hardware offload handling.
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Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.