In the Linux kernel, the following vulnerability has been resolved:

ipv6: addrconf: bail out of dad_failure when state is no longer POSTDAD

addrconf_dad_failure() transitions ifp->state from DAD to POSTDAD
via addrconf_dad_end(), which drops ifp->lock on return.  The lock
is re-acquired after net_info_ratelimited().  A concurrent
ipv6_del_addr() can take the lock in that window, set ifp->state
to DEAD and run list_del_rcu(&ifp->if_list).

addrconf_dad_failure() then overwrites DEAD with ERRDAD at errdad:
and schedules a new dad_work.  The work calls ipv6_del_addr()
again, hitting the already-poisoned list entry:

  general protection fault: 0000 [#1] SMP NOPTI
  CPU: 4 PID: 217 Comm: kworker/4:1
  Workqueue: ipv6_addrconf addrconf_dad_work
  RIP: 0010:ipv6_del_addr+0xe9/0x280
  RAX: dead000000000122
  Call Trace:
   addrconf_dad_stop+0x113/0x140
   addrconf_dad_work+0x28c/0x430
   process_one_work+0x1eb/0x3b0
   worker_thread+0x4d/0x400
   kthread+0x104/0x140
   ret_from_fork+0x35/0x40

Fold the addrconf_dad_end() logic into addrconf_dad_failure() under
a single ifp->lock critical section.  The STABLE_PRIVACY branch
temporarily drops ifp->lock around address regeneration, so at
lock_errdad: verify the state is still POSTDAD before transitioning
to ERRDAD; bail out otherwise to avoid overwriting a state set by
another path while the lock was released.

https://git.kernel.org/stable/c/3bdc86d89fd6c6523753fa6f42fcfaf30ee699cb

https://git.kernel.org/stable/c/47b05836705b63dab93d9ac7c69a3a507375ef80

https://git.kernel.org/stable/c/627ac78f2741e2ebd2225e2e953b6964a8a9182f

https://git.kernel.org/stable/c/875c284c0f98b042bb97abad460f63a24c977f88

https://git.kernel.org/stable/c/8ed0ce9ea58d677d1bac92614ee5f60f8ea57363

https://git.kernel.org/stable/c/b61af0268e3d1308c466bf0be5dced844eafc1ef

https://git.kernel.org/stable/c/d21be7d051012c6b572fa4e3334443c250216f7b

https://git.kernel.org/stable/c/e889aa99ad3ed48bb0ddcff6475b17542532d18b

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