{"id":"AZL-110614","summary":"CVE-2026-98881 affecting package kernel 6.6.157.1-1","details":"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 \u003cTASK\u003e\n  [\u003cffffffff81914eaa\u003e] context_switch+0xf2a/0x1730 kernel/sched/core.c:6483\n  [\u003cffffffff81201143\u003e] __schedule+0x1133/0x43a0 kernel/sched/core.c:8411\n  [\u003cffffffff8120446b\u003e] __schedule_loop kernel/sched/core.c:8514 [inline]\n  [\u003cffffffff8120446b\u003e] schedule+0xab/0x260 kernel/sched/core.c:8529\n  [\u003cffffffff8121a093\u003e] schedule_timeout+0xc3/0x2b0 kernel/time/sleep_timeout.c:75\n  [\u003cffffffff81205347\u003e] do_wait_for_common kernel/sched/completion.c:100 [inline]\n  [\u003cffffffff81205347\u003e] __wait_for_common kernel/sched/completion.c:121 [inline]\n  [\u003cffffffff81205347\u003e] wait_for_common kernel/sched/completion.c:132 [inline]\n  [\u003cffffffff81205347\u003e] wait_for_completion+0x2c7/0x5d0 kernel/sched/completion.c:153\n  [\u003cffffffff81b8f27f\u003e] rcu_barrier+0x49f/0x620 kernel/rcu/tree.c:3888\n  [\u003cffffffff860091b3\u003e] br_multicast_dev_del+0x303/0x350 net/bridge/br_multicast.c:4459\n  [\u003cffffffff85fb5dbc\u003e] br_dev_uninit+0x1c/0x40 net/bridge/br_device.c:157\n  [\u003cffffffff8568058c\u003e] unregister_netdevice_many_notify+0x1c1c/0x2300 net/core/dev.c:12599\n  [\u003cffffffff8562be43\u003e] ops_exit_rtnl_list net/core/net_namespace.c:187 [inline]\n  [\u003cffffffff8562be43\u003e] ops_undo_list+0x3d3/0x940 net/core/net_namespace.c:248","modified":"2026-10-30T05:35:37Z","published":"2026-10-23T12:18:21Z","upstream":["CVE-2026-98881"],"references":[{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98881"}],"affected":[{"package":{"name":"kernel","ecosystem":"Azure Linux:3","purl":"pkg:rpm/azure-linux/kernel"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"6.6.157.1-1"}]}],"database_specific":{"source":"https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-110614.json"}}],"schema_version":"1.9.2"}