{"id":"CVE-2026-98347","published":"2026-10-06T09:18:27.773","lastModified":"2026-10-06T09:18:27.773","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nIB/IPoIB: Avoid restoring OPER_UP after multicast flush\n\nipoib_ib_dev_flush_light() temporarily clears IPOIB_FLAG_OPER_UP to\nprevent multicast joins while ipoib_mcast_dev_flush() is running, and\nrestores the flag afterwards if it was previously set.\n\nThis restore races with ipoib_ib_dev_down(). If the interface is brought\ndown while the flush is in progress, ipoib_ib_dev_down() clears\nIPOIB_FLAG_OPER_UP, but the flush path may set it again after the device\nhas already gone down.\n\nSince commit 894021a75291 (\"IB/ipoib: Make the carrier_on_task race\naware\"), ipoib_mcast_carrier_on_task() relies on IPOIB_FLAG_OPER_UP\nbeing cleared to terminate its rtnl_trylock() retry loop. If the flag is\nleft set after shutdown, the workqueue retries forever, causing teardown\nto deadlock when ipoib_ndo_uninit() waits in destroy_workqueue() while\nholding RTNL.\n\nInstead of overloading IPOIB_FLAG_OPER_UP to block multicast joins\nduring a light flush, introduce a dedicated IPOIB_FLAG_MCAST_FLUSH flag.\nUse it together with IPOIB_FLAG_OPER_UP to determine whether multicast\njoins are allowed, avoiding the race with device shutdown.","cvssScore":null,"cvssSeverity":null,"cvssVector":null,"cwes":[],"vendors":[],"products":[],"references":[{"url":"https://git.kernel.org/stable/c/188b334a6db36a8e0bfaaf59bc4020639a0f3aad","tags":[]},{"url":"https://git.kernel.org/stable/c/1b11e4b55b41d9e69a8e8d07622614202e2eaca9","tags":[]},{"url":"https://git.kernel.org/stable/c/1ff3add37c329704ec46181b4ae4f00f9f16ce6f","tags":[]},{"url":"https://git.kernel.org/stable/c/326f7d34bd7e64de535566b65c0533b640df5a81","tags":[]},{"url":"https://git.kernel.org/stable/c/5ad925d45f28464a5e043c9620880bb6a030da89","tags":[]},{"url":"https://git.kernel.org/stable/c/9a141d3dc869d18b2eab35e999f4790a9b84e40f","tags":[]},{"url":"https://git.kernel.org/stable/c/b72f38929f4b5aa83161fd3b22a7327207e51ec5","tags":[]},{"url":"https://git.kernel.org/stable/c/f973769fb7cb33ba0d4a64b7dcfee0cabaead938","tags":[]}],"exploitRefs":[],"hasPoc":false,"ai":null}