{"api_version":"1","generated_at":"2026-10-26T06:23:55+00:00","cve":"CVE-2026-98881","urls":{"html":"https://cve.report/CVE-2026-98881","api":"https://cve.report/api/cve/CVE-2026-98881.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-98881","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-98881"},"summary":{"title":"net: bridge: remove stale rcu_barrier() in br_multicast_dev_del()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: bridge: remove stale rcu_barrier() in br_multicast_dev_del()\n\nThis rcu_barrier() came from a time call_rcu() calls were used in\nnet/bridge/br_multicast.c.\n\nNow kfree_rcu() is there, we can remove this problematic rcu_barrier()\nwhich causes extreme RTNL pressure in many syzbot reports.\n\nINFO: task syz-executor:77945 is blocked on a mutex likely owned by task kworker/u1024:5:36537.\ntask:kworker/u1024:5 state:D stack:24616 pid:36537 tgid:36537 ppid:2      task_flags:0x4208060 flags:0x00080000 last_sleep:612797637337\nWorkqueue: netns cleanup_net\nCall Trace:\n <TASK>\n  [<ffffffff81914eaa>] context_switch+0xf2a/0x1730 kernel/sched/core.c:6483\n  [<ffffffff81201143>] __schedule+0x1133/0x43a0 kernel/sched/core.c:8411\n  [<ffffffff8120446b>] __schedule_loop kernel/sched/core.c:8514 [inline]\n  [<ffffffff8120446b>] schedule+0xab/0x260 kernel/sched/core.c:8529\n  [<ffffffff8121a093>] schedule_timeout+0xc3/0x2b0 kernel/time/sleep_timeout.c:75\n  [<ffffffff81205347>] do_wait_for_common kernel/sched/completion.c:100 [inline]\n  [<ffffffff81205347>] __wait_for_common kernel/sched/completion.c:121 [inline]\n  [<ffffffff81205347>] wait_for_common kernel/sched/completion.c:132 [inline]\n  [<ffffffff81205347>] wait_for_completion+0x2c7/0x5d0 kernel/sched/completion.c:153\n  [<ffffffff81b8f27f>] rcu_barrier+0x49f/0x620 kernel/rcu/tree.c:3888\n  [<ffffffff860091b3>] br_multicast_dev_del+0x303/0x350 net/bridge/br_multicast.c:4459\n  [<ffffffff85fb5dbc>] br_dev_uninit+0x1c/0x40 net/bridge/br_device.c:157\n  [<ffffffff8568058c>] unregister_netdevice_many_notify+0x1c1c/0x2300 net/core/dev.c:12599\n  [<ffffffff8562be43>] ops_exit_rtnl_list net/core/net_namespace.c:187 [inline]\n  [<ffffffff8562be43>] ops_undo_list+0x3d3/0x940 net/core/net_namespace.c:248","state":"PUBLISHED","assigner":"Linux","published_at":"2026-10-23 12:18:21","updated_at":"2026-10-23 12:18:21"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/35f9f11740515a10b084adfb1ce691351f2452ab","name":"https://git.kernel.org/stable/c/35f9f11740515a10b084adfb1ce691351f2452ab","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/39679927fa7aaf4601119f7234342d1b5d4f6f84","name":"https://git.kernel.org/stable/c/39679927fa7aaf4601119f7234342d1b5d4f6f84","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/372ee8fbe0f796031c60f676ec90f0788c26523d","name":"https://git.kernel.org/stable/c/372ee8fbe0f796031c60f676ec90f0788c26523d","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/0443f6aac6bf6a91e406273fdda11497cef6ad07","name":"https://git.kernel.org/stable/c/0443f6aac6bf6a91e406273fdda11497cef6ad07","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/ac0e823a228f94ad9d7a3d876cc07e59a7afb806","name":"https://git.kernel.org/stable/c/ac0e823a228f94ad9d7a3d876cc07e59a7afb806","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/25ae123db10ba9ab890b56bcdb0a4363aee8529a","name":"https://git.kernel.org/stable/c/25ae123db10ba9ab890b56bcdb0a4363aee8529a","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/f0018acf0b66f93a292667c9a9c2a26c570cf270","name":"https://git.kernel.org/stable/c/f0018acf0b66f93a292667c9a9c2a26c570cf270","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-98881","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98881","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 35f9f11740515a10b084adfb1ce691351f2452ab git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 0443f6aac6bf6a91e406273fdda11497cef6ad07 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 ac0e823a228f94ad9d7a3d876cc07e59a7afb806 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 f0018acf0b66f93a292667c9a9c2a26c570cf270 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 372ee8fbe0f796031c60f676ec90f0788c26523d git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 39679927fa7aaf4601119f7234342d1b5d4f6f84 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 25ae123db10ba9ab890b56bcdb0a4363aee8529a git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.10.271 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.15.222 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.1.189 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.6.158 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.12.111 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.18.53 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.10.271 5.10.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.222 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.189 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.158 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.111 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.53 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["net/bridge/br_multicast.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"35f9f11740515a10b084adfb1ce691351f2452ab","status":"affected","version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","versionType":"git"},{"lessThan":"0443f6aac6bf6a91e406273fdda11497cef6ad07","status":"affected","version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","versionType":"git"},{"lessThan":"ac0e823a228f94ad9d7a3d876cc07e59a7afb806","status":"affected","version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","versionType":"git"},{"lessThan":"f0018acf0b66f93a292667c9a9c2a26c570cf270","status":"affected","version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","versionType":"git"},{"lessThan":"372ee8fbe0f796031c60f676ec90f0788c26523d","status":"affected","version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","versionType":"git"},{"lessThan":"39679927fa7aaf4601119f7234342d1b5d4f6f84","status":"affected","version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","versionType":"git"},{"lessThan":"25ae123db10ba9ab890b56bcdb0a4363aee8529a","status":"affected","version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","versionType":"git"},{"lessThan":"5.10.271","status":"affected","version":"0","versionType":"semver"},{"lessThan":"5.15.222","status":"affected","version":"0","versionType":"semver"},{"lessThan":"6.1.189","status":"affected","version":"0","versionType":"semver"},{"lessThan":"6.6.158","status":"affected","version":"0","versionType":"semver"},{"lessThan":"6.12.111","status":"affected","version":"0","versionType":"semver"},{"lessThan":"6.18.53","status":"affected","version":"0","versionType":"semver"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["net/bridge/br_multicast.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.271","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.222","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.189","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.158","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.111","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.53","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.2","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.271","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.222","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.189","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.158","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.111","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.53","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: bridge: remove stale rcu_barrier() in br_multicast_dev_del()\n\nThis rcu_barrier() came from a time call_rcu() calls were used in\nnet/bridge/br_multicast.c.\n\nNow kfree_rcu() is there, we can remove this problematic rcu_barrier()\nwhich causes extreme RTNL pressure in many syzbot reports.\n\nINFO: task syz-executor:77945 is blocked on a mutex likely owned by task kworker/u1024:5:36537.\ntask:kworker/u1024:5 state:D stack:24616 pid:36537 tgid:36537 ppid:2      task_flags:0x4208060 flags:0x00080000 last_sleep:612797637337\nWorkqueue: netns cleanup_net\nCall Trace:\n <TASK>\n  [<ffffffff81914eaa>] context_switch+0xf2a/0x1730 kernel/sched/core.c:6483\n  [<ffffffff81201143>] __schedule+0x1133/0x43a0 kernel/sched/core.c:8411\n  [<ffffffff8120446b>] __schedule_loop kernel/sched/core.c:8514 [inline]\n  [<ffffffff8120446b>] schedule+0xab/0x260 kernel/sched/core.c:8529\n  [<ffffffff8121a093>] schedule_timeout+0xc3/0x2b0 kernel/time/sleep_timeout.c:75\n  [<ffffffff81205347>] do_wait_for_common kernel/sched/completion.c:100 [inline]\n  [<ffffffff81205347>] __wait_for_common kernel/sched/completion.c:121 [inline]\n  [<ffffffff81205347>] wait_for_common kernel/sched/completion.c:132 [inline]\n  [<ffffffff81205347>] wait_for_completion+0x2c7/0x5d0 kernel/sched/completion.c:153\n  [<ffffffff81b8f27f>] rcu_barrier+0x49f/0x620 kernel/rcu/tree.c:3888\n  [<ffffffff860091b3>] br_multicast_dev_del+0x303/0x350 net/bridge/br_multicast.c:4459\n  [<ffffffff85fb5dbc>] br_dev_uninit+0x1c/0x40 net/bridge/br_device.c:157\n  [<ffffffff8568058c>] unregister_netdevice_many_notify+0x1c1c/0x2300 net/core/dev.c:12599\n  [<ffffffff8562be43>] ops_exit_rtnl_list net/core/net_namespace.c:187 [inline]\n  [<ffffffff8562be43>] ops_undo_list+0x3d3/0x940 net/core/net_namespace.c:248"}],"providerMetadata":{"dateUpdated":"2026-10-23T11:37:32.327Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/35f9f11740515a10b084adfb1ce691351f2452ab"},{"url":"https://git.kernel.org/stable/c/0443f6aac6bf6a91e406273fdda11497cef6ad07"},{"url":"https://git.kernel.org/stable/c/ac0e823a228f94ad9d7a3d876cc07e59a7afb806"},{"url":"https://git.kernel.org/stable/c/f0018acf0b66f93a292667c9a9c2a26c570cf270"},{"url":"https://git.kernel.org/stable/c/372ee8fbe0f796031c60f676ec90f0788c26523d"},{"url":"https://git.kernel.org/stable/c/39679927fa7aaf4601119f7234342d1b5d4f6f84"},{"url":"https://git.kernel.org/stable/c/25ae123db10ba9ab890b56bcdb0a4363aee8529a"}],"title":"net: bridge: remove stale rcu_barrier() in br_multicast_dev_del()","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-98881","datePublished":"2026-10-23T11:37:32.327Z","dateReserved":"2026-09-25T10:25:14.378Z","dateUpdated":"2026-10-23T11:37:32.327Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-10-23 12:18:21","lastModifiedDate":"2026-10-23 12:18:21","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"98881","Ordinal":"1","Title":"net: bridge: remove stale rcu_barrier() in br_multicast_dev_del(","CVE":"CVE-2026-98881","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"98881","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: bridge: remove stale rcu_barrier() in br_multicast_dev_del()\n\nThis rcu_barrier() came from a time call_rcu() calls were used in\nnet/bridge/br_multicast.c.\n\nNow kfree_rcu() is there, we can remove this problematic rcu_barrier()\nwhich causes extreme RTNL pressure in many syzbot reports.\n\nINFO: task syz-executor:77945 is blocked on a mutex likely owned by task kworker/u1024:5:36537.\ntask:kworker/u1024:5 state:D stack:24616 pid:36537 tgid:36537 ppid:2      task_flags:0x4208060 flags:0x00080000 last_sleep:612797637337\nWorkqueue: netns cleanup_net\nCall Trace:\n <TASK>\n  [<ffffffff81914eaa>] context_switch+0xf2a/0x1730 kernel/sched/core.c:6483\n  [<ffffffff81201143>] __schedule+0x1133/0x43a0 kernel/sched/core.c:8411\n  [<ffffffff8120446b>] __schedule_loop kernel/sched/core.c:8514 [inline]\n  [<ffffffff8120446b>] schedule+0xab/0x260 kernel/sched/core.c:8529\n  [<ffffffff8121a093>] schedule_timeout+0xc3/0x2b0 kernel/time/sleep_timeout.c:75\n  [<ffffffff81205347>] do_wait_for_common kernel/sched/completion.c:100 [inline]\n  [<ffffffff81205347>] __wait_for_common kernel/sched/completion.c:121 [inline]\n  [<ffffffff81205347>] wait_for_common kernel/sched/completion.c:132 [inline]\n  [<ffffffff81205347>] wait_for_completion+0x2c7/0x5d0 kernel/sched/completion.c:153\n  [<ffffffff81b8f27f>] rcu_barrier+0x49f/0x620 kernel/rcu/tree.c:3888\n  [<ffffffff860091b3>] br_multicast_dev_del+0x303/0x350 net/bridge/br_multicast.c:4459\n  [<ffffffff85fb5dbc>] br_dev_uninit+0x1c/0x40 net/bridge/br_device.c:157\n  [<ffffffff8568058c>] unregister_netdevice_many_notify+0x1c1c/0x2300 net/core/dev.c:12599\n  [<ffffffff8562be43>] ops_exit_rtnl_list net/core/net_namespace.c:187 [inline]\n  [<ffffffff8562be43>] ops_undo_list+0x3d3/0x940 net/core/net_namespace.c:248","Type":"Description","Title":"net: bridge: remove stale rcu_barrier() in br_multicast_dev_del("}]}}}