{"id":"CVE-2026-98347","state":"PUBLISHED","title":"IB/IPoIB: Avoid restoring OPER_UP after multicast flush","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.","publishedAt":"2026-10-06T08:46:36.136Z","updatedAt":"2026-10-19T09:17:58.195Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"344bacca8cd811809fc33a249f2738ab757d327f","status":"affected","lessThan":"f973769fb7cb33ba0d4a64b7dcfee0cabaead938","versionType":"git"},{"version":"344bacca8cd811809fc33a249f2738ab757d327f","status":"affected","lessThan":"b72f38929f4b5aa83161fd3b22a7327207e51ec5","versionType":"git"},{"version":"344bacca8cd811809fc33a249f2738ab757d327f","status":"affected","lessThan":"1b11e4b55b41d9e69a8e8d07622614202e2eaca9","versionType":"git"},{"version":"344bacca8cd811809fc33a249f2738ab757d327f","status":"affected","lessThan":"326f7d34bd7e64de535566b65c0533b640df5a81","versionType":"git"},{"version":"344bacca8cd811809fc33a249f2738ab757d327f","status":"affected","lessThan":"5ad925d45f28464a5e043c9620880bb6a030da89","versionType":"git"},{"version":"344bacca8cd811809fc33a249f2738ab757d327f","status":"affected","lessThan":"188b334a6db36a8e0bfaaf59bc4020639a0f3aad","versionType":"git"},{"version":"344bacca8cd811809fc33a249f2738ab757d327f","status":"affected","lessThan":"1ff3add37c329704ec46181b4ae4f00f9f16ce6f","versionType":"git"},{"version":"344bacca8cd811809fc33a249f2738ab757d327f","status":"affected","lessThan":"9a141d3dc869d18b2eab35e999f4790a9b84e40f","versionType":"git"},{"version":"a289c65ca49d2680a3d797e633e57a45573d1df2","status":"affected","versionType":"git"},{"version":"b81459c78935e4579a577b2366c5f8878d3c7fee","status":"affected","versionType":"git"},{"version":"8a9d8dc9ce83a90bfbbe69181acc4cf1beff46f5","status":"affected","versionType":"git"},{"version":"dfe809702a11bd7fb91c882fb55620e39ce22109","status":"affected","versionType":"git"},{"version":"87160fb51bc343793cc8f5f031a87f1a35aecb82","status":"affected","versionType":"git"},{"version":"749fd55dd210f9676f0d445a6efaaa3bec65174a","status":"affected","versionType":"git"},{"version":"3.2.84","status":"affected","lessThan":"3.3","versionType":"semver"},{"version":"3.10.105","status":"affected","lessThan":"3.11","versionType":"semver"},{"version":"3.12.65","status":"affected","lessThan":"3.13","versionType":"semver"},{"version":"3.16.39","status":"affected","lessThan":"3.17","versionType":"semver"},{"version":"4.4.24","status":"affected","lessThan":"4.5","versionType":"semver"},{"version":"4.7.7","status":"affected","lessThan":"4.8","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/infiniband/ulp/ipoib/ipoib.h","drivers/infiniband/ulp/ipoib/ipoib_ib.c","drivers/infiniband/ulp/ipoib/ipoib_multicast.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.8","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.8","versionType":"semver"},{"version":"5.10.271","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.222","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.189","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.158","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.112","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.54","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.8","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/infiniband/ulp/ipoib/ipoib.h","drivers/infiniband/ulp/ipoib/ipoib_ib.c","drivers/infiniband/ulp/ipoib/ipoib_multicast.c"]}],"references":["https://git.kernel.org/stable/c/f973769fb7cb33ba0d4a64b7dcfee0cabaead938","https://git.kernel.org/stable/c/b72f38929f4b5aa83161fd3b22a7327207e51ec5","https://git.kernel.org/stable/c/1b11e4b55b41d9e69a8e8d07622614202e2eaca9","https://git.kernel.org/stable/c/326f7d34bd7e64de535566b65c0533b640df5a81","https://git.kernel.org/stable/c/5ad925d45f28464a5e043c9620880bb6a030da89","https://git.kernel.org/stable/c/188b334a6db36a8e0bfaaf59bc4020639a0f3aad","https://git.kernel.org/stable/c/1ff3add37c329704ec46181b4ae4f00f9f16ce6f","https://git.kernel.org/stable/c/9a141d3dc869d18b2eab35e999f4790a9b84e40f"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:43.249Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/98xxx/CVE-2026-98347.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-98347","state":"PUBLISHED","datePublished":"2026-10-06T08:46:36.136Z","dateUpdated":"2026-10-19T09:17:58.195Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-25T10:25:14.343Z"},"containers":{"cna":{"title":"IB/IPoIB: Avoid restoring OPER_UP after multicast flush","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"344bacca8cd811809fc33a249f2738ab757d327f","status":"affected","lessThan":"f973769fb7cb33ba0d4a64b7dcfee0cabaead938","versionType":"git"},{"version":"344bacca8cd811809fc33a249f2738ab757d327f","status":"affected","lessThan":"b72f38929f4b5aa83161fd3b22a7327207e51ec5","versionType":"git"},{"version":"344bacca8cd811809fc33a249f2738ab757d327f","status":"affected","lessThan":"1b11e4b55b41d9e69a8e8d07622614202e2eaca9","versionType":"git"},{"version":"344bacca8cd811809fc33a249f2738ab757d327f","status":"affected","lessThan":"326f7d34bd7e64de535566b65c0533b640df5a81","versionType":"git"},{"version":"344bacca8cd811809fc33a249f2738ab757d327f","status":"affected","lessThan":"5ad925d45f28464a5e043c9620880bb6a030da89","versionType":"git"},{"version":"344bacca8cd811809fc33a249f2738ab757d327f","status":"affected","lessThan":"188b334a6db36a8e0bfaaf59bc4020639a0f3aad","versionType":"git"},{"version":"344bacca8cd811809fc33a249f2738ab757d327f","status":"affected","lessThan":"1ff3add37c329704ec46181b4ae4f00f9f16ce6f","versionType":"git"},{"version":"344bacca8cd811809fc33a249f2738ab757d327f","status":"affected","lessThan":"9a141d3dc869d18b2eab35e999f4790a9b84e40f","versionType":"git"},{"version":"a289c65ca49d2680a3d797e633e57a45573d1df2","status":"affected","versionType":"git"},{"version":"b81459c78935e4579a577b2366c5f8878d3c7fee","status":"affected","versionType":"git"},{"version":"8a9d8dc9ce83a90bfbbe69181acc4cf1beff46f5","status":"affected","versionType":"git"},{"version":"dfe809702a11bd7fb91c882fb55620e39ce22109","status":"affected","versionType":"git"},{"version":"87160fb51bc343793cc8f5f031a87f1a35aecb82","status":"affected","versionType":"git"},{"version":"749fd55dd210f9676f0d445a6efaaa3bec65174a","status":"affected","versionType":"git"},{"version":"3.2.84","status":"affected","lessThan":"3.3","versionType":"semver"},{"version":"3.10.105","status":"affected","lessThan":"3.11","versionType":"semver"},{"version":"3.12.65","status":"affected","lessThan":"3.13","versionType":"semver"},{"version":"3.16.39","status":"affected","lessThan":"3.17","versionType":"semver"},{"version":"4.4.24","status":"affected","lessThan":"4.5","versionType":"semver"},{"version":"4.7.7","status":"affected","lessThan":"4.8","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/infiniband/ulp/ipoib/ipoib.h","drivers/infiniband/ulp/ipoib/ipoib_ib.c","drivers/infiniband/ulp/ipoib/ipoib_multicast.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.8","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.8","versionType":"semver"},{"version":"5.10.271","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.222","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.189","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.158","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.112","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.54","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.8","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/infiniband/ulp/ipoib/ipoib.h","drivers/infiniband/ulp/ipoib/ipoib_ib.c","drivers/infiniband/ulp/ipoib/ipoib_multicast.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/f973769fb7cb33ba0d4a64b7dcfee0cabaead938"},{"url":"https://git.kernel.org/stable/c/b72f38929f4b5aa83161fd3b22a7327207e51ec5"},{"url":"https://git.kernel.org/stable/c/1b11e4b55b41d9e69a8e8d07622614202e2eaca9"},{"url":"https://git.kernel.org/stable/c/326f7d34bd7e64de535566b65c0533b640df5a81"},{"url":"https://git.kernel.org/stable/c/5ad925d45f28464a5e043c9620880bb6a030da89"},{"url":"https://git.kernel.org/stable/c/188b334a6db36a8e0bfaaf59bc4020639a0f3aad"},{"url":"https://git.kernel.org/stable/c/1ff3add37c329704ec46181b4ae4f00f9f16ce6f"},{"url":"https://git.kernel.org/stable/c/9a141d3dc869d18b2eab35e999f4790a9b84e40f"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-19T09:17:58.195Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.8","versionEndExcluding":"5.10.271"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.8","versionEndExcluding":"5.15.222"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versio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