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CVE-2024-26837 is a race condition in the Linux kernel bridge switchdev multicast database (MDB) offload event-replay handling. While generating an MDB replay list, newly created multicast memberships could become visible in the bridge MDB list before their deferred switchdev addition notifications had been delivered. The replay could consequently include an addition event that was also still queued for deferred delivery. Offload drivers received two additions for one membership but only one deletion when the bridge was destroyed. Reference-counting drivers, including DSA drivers, could retain orphaned multicast memberships in hardware. The fix serializes replay-list generation with the MDB write-side lock and excludes replay entries whose deferred addition event is already queued.
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A Linux kernel networking bridge/switchdev flaw involving multicast database replay handling for deferred offload events.
Unknown
A medium-severity Linux kernel bridge/switchdev vulnerability concerning replay of multicast database (MDB) deferred events during hardware offload handling.
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Cross-references every affected SKU, including bundled OEM variants.
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