CVE-2026-98881

CVE-2026-98881 updated by NVD

Modified

2026-10-28

Sources

nvd

Summary

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: [ ] context_switch+0xf2a/0x1730 kernel/sched/core.c:6483 [ ] __schedule+0x1133/0x43a0 kernel/sched/core.c:8411 [ ] __schedule_loop kernel/sched/core.c:8514 [inline] [ ] schedule+0xab/0x260 kernel/sched/core.c:8529 [ ] schedule_timeout+0xc3/0x2b0 kernel/time/sleep_timeout.c:75 [ ] do_wait_for_common kernel/sched/completion.c:100 [inline] [ ] __wait_for_common kernel/sched/completion.c:121 [inline] [ ] wait_for_common kernel/sched/completion.c:132 [inline] [ ] wait_for_completion+0x2c7/0x5d0 kernel/sched/completion.c:153 [ ] rcu_barrier+0x49f/0x620 kernel/rcu/tree.c:3888 [ ] br_multicast_dev_del+0x303/0x350 net/bridge/br_multicast.c:4459 [ ] br_dev_uninit+0x1c/0x40 net/bridge/br_device.c:157 [ ] unregister_netdevice_many_notify+0x1c1c/0x2300 net/core/dev.c:12599 [ ] ops_exit_rtnl_list net/core/net_namespace.c:187 [inline] [ ] ops_undo_list+0x3d3/0x940 net/core/net_namespace.c:248

References

• https://nvd.nist.gov/vuln/detail/CVE-2026-98881