Answer in brief
CVE-2026-98881 records a Unknown severity vulnerability in net: bridge: remove stale rcu_barrier() in br_multicast_dev_del(). The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <35f9f11740515a10b084adfb1ce691351f2452ab || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <0443f6aac6bf6a91e406273fdda11497cef6ad07 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ac0e823a228f94ad9d7a3d876cc07e59a7afb806 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <f0018acf0b66f93a292667c9a9c2a26c570cf270 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <372ee8fbe0f796031c60f676ec90f0788c26523d || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <39679927fa7aaf4601119f7234342d1b5d4f6f84 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <25ae123db10ba9ab890b56bcdb0a4363aee8529a || >=0 <5.10.271 || >=0 <5.15.222 || >=0 <6.1.189 || >=0 <6.6.158 || >=0 <6.12.111 || >=0 <6.18.53 | 35f9f11740515a10b084adfb1ce691351f2452ab, 0443f6aac6bf6a91e406273fdda11497cef6ad07, ac0e823a228f94ad9d7a3d876cc07e59a7afb806, f0018acf0b66f93a292667c9a9c2a26c570cf270, 372ee8fbe0f796031c60f676ec90f0788c26523d, 39679927fa7aaf4601119f7234342d1b5d4f6f84, 25ae123db10ba9ab890b56bcdb0a4363aee8529a, 5.10.271, 5.15.222, 6.1.189, 6.6.158, 6.12.111, 6.18.53 |
Published upstream
Oct 23, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 23, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Oct 23, 2026
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: <TASK> [<ffffffff81914eaa>] context_switch+0xf2a/0x1730 kernel/sched/core.c:6483 [<ffffffff81201143>] __schedule+0x1133/0x43a0 kernel/sched/core.c:8411 [<ffffffff8120446b>] __schedule_loop kernel/sched/core.c:8514 [inline] [<ffffffff8120446b>] schedule+0xab/0x260 kernel/sched/core.c:8529 [<ffffffff8121a093>] schedule_timeout+0xc3/0x2b0 kernel/time/sleep_timeout.c:75 [<ffffffff81205347>] do_wait_for_common kernel/sched/completion.c:100 [inline] [<ffffffff81205347>] __wait_for_common kernel/sched/completion.c:121 [inline] [<ffffffff81205347>] wait_for_common kernel/sched/completion.c:132 [inline] [<ffffffff81205347>] wait_for_completion+0x2c7/0x5d0 kernel/sched/completion.c:153 [<ffffffff81b8f27f>] rcu_barrier+0x49f/0x620 kernel/rcu/tree.c:3888 [<ffffffff860091b3>] br_multicast_dev_del+0x303/0x350 net/bridge/br_multicast.c:4459 [<ffffffff85fb5dbc>] br_dev_uninit+0x1c/0x40 net/bridge/br_device.c:157 [<ffffffff8568058c>] unregister_netdevice_many_notify+0x1c1c/0x2300 net/core/dev.c:12599 [<ffffffff8562be43>] ops_exit_rtnl_list net/core/net_namespace.c:187 [inline] [<ffffffff8562be43>] ops_undo_list+0x3d3/0x940 net/core/net_namespace.c:248
Quoted source text, attributed separately from HOL analysis.