{
  "cveId": "CVE-2026-98881",
  "url": "https://patchblox.com/security/cve/CVE-2026-98881",
  "summary": "CVE-2026-98881 is fixed in 75 products on 1 platform, first by DEBIAN-CVE-2026-98881, released October 24, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "net: bridge: remove stale rcu_barrier() in br_multicast_dev_del()",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  net: bridge: remove stale rcu_barrier() in br_multicast_dev_del()  This rcu_barrier() came from a time call_rcu() calls were used in net/bridge/br_multicast.c.  Now kfree_rcu() is there, we can remove this problematic rcu_barrier() which causes extreme RTNL pressure in many syzbot reports.  INFO: task syz-executor:77945 is blocked on a mutex likely owned by task kworker/u1024:5:36537. task:kworker/u1024:5 state:D stack:24616 pid:36537 tgid:36537 ppid:2      task_flags:0x4208060 flags:0x00080000 last_sleep:612797637337 Workqueue: netns cleanup_net Call Trace:  \u003CTASK\u003E   [\u003Cffffffff81914eaa\u003E] context_switch\u002B0xf2a/0x1730 kernel/sched/core.c:6483   [\u003Cffffffff81201143\u003E] __schedule\u002B0x1133/0x43a0 kernel/sched/core.c:8411   [\u003Cffffffff8120446b\u003E] __schedule_loop kernel/sched/core.c:8514 [inline]   [\u003Cffffffff8120446b\u003E] schedule\u002B0xab/0x260 kernel/sched/core.c:8529   [\u003Cffffffff8121a093\u003E] schedule_timeout\u002B0xc3/0x2b0 kernel/time/sleep_timeout.c:75   [\u003Cffffffff81205347\u003E] do_wait_for_common kernel/sched/completion.c:100 [inline]   [\u003Cffffffff81205347\u003E] __wait_for_common kernel/sched/completion.c:121 [inline]   [\u003Cffffffff81205347\u003E] wait_for_common kernel/sched/completion.c:132 [inline]   [\u003Cffffffff81205347\u003E] wait_for_completion\u002B0x2c7/0x5d0 kernel/sched/completion.c:153   [\u003Cffffffff81b8f27f\u003E] rcu_barrier\u002B0x49f/0x620 kernel/rcu/tree.c:3888   [\u003Cffffffff860091b3\u003E] br_multicast_dev_del\u002B0x303/0x350 net/bridge/br_multicast.c:4459   [\u003Cffffffff85fb5dbc\u003E] br_dev_uninit\u002B0x1c/0x40 net/bridge/br_device.c:157   [\u003Cffffffff8568058c\u003E] unregister_netdevice_many_notify\u002B0x1c1c/0x2300 net/core/dev.c:12599   [\u003Cffffffff8562be43\u003E] ops_exit_rtnl_list net/core/net_namespace.c:187 [inline]   [\u003Cffffffff8562be43\u003E] ops_undo_list\u002B0x3d3/0x940 net/core/net_namespace.c:248",
  "published": "2026-10-12T09:00:00Z",
  "severity": "Moderate",
  "cvss": 7.1,
  "epss": 0.00179,
  "epssPercentile": 0.07494,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-98881",
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