CVE-2026-46165
published 2026-05-28CVE-2026-46165: In the Linux kernel, the following vulnerability has been resolved: openvswitch: vport: fix self-deadlock on release of tunnel ports vports are used…
medium5.5
In the Linux kernel, the following vulnerability has been resolved:
openvswitch: vport: fix self-deadlock on release of tunnel ports
vports are used concurrently and protected by RCU, so netdev_put()
must happen after the RCU grace period. So, either in an RCU call or
after the synchronize_net(). The rtnl_delete_link() must happen under
RTNL and so can't be executed in RCU context. Calling synchronize_net()
while holding RTNL is not a good idea for performance and system
stability under load in general, so calling netdev_put() in RCU call
is the right solution here.
However,
when the device is deleted, rtnl_unlock() will call netdev_run_todo()
and block until all the references are gone. In the current code this
means that we never reach the call_rcu() and the vport is never freed
and the reference is never released, causing a self-deadlock on device
removal.
Fix that by moving the rcu_call() before the rtnl_unlock(), so the
scheduled RCU callback will be executed when synchronize_net() is
called from the rtnl_unlock()->netdev_run_todo() while the RTNL itself
is already released.
Affected
14 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| linux | linux | — | — |
| linux | linux | — | — |
| linux | linux | >= 42f0d3d81209654c08ffdde5a34b9b92d2645896 < c741433f6c8dcdecd1d9549d89053761fd1ea413 | c741433f6c8dcdecd1d9549d89053761fd1ea413 |
| linux | linux | >= 6.1.168 < 6.1.175 | 6.1.175 |
| linux | linux | >= 6.12.80 < 6.12.88 | 6.12.88 |
| linux | linux | >= 6.18.21 < 6.18.30 | 6.18.30 |
| linux | linux | >= 6.19.11 < 6.20 | 6.20 |
| linux | linux | >= 6.6.131 < 6.6.140 | 6.6.140 |
| linux | linux | >= 6931d21f87bc6d657f145798fad0bf077b82486c < 366c482965c673565ecb8bcfb15d5548f13a6a10 | 366c482965c673565ecb8bcfb15d5548f13a6a10 |
| linux | linux | >= 6931d21f87bc6d657f145798fad0bf077b82486c < aa69918bd418e700309fdd08509dba324fb24296 | aa69918bd418e700309fdd08509dba324fb24296 |
| linux | linux | >= 98b726ab5e2a4811e27c28e4d041f75bba147eab < 3df75fff46b1517eb479d8e6b8e3500763715dd0 | 3df75fff46b1517eb479d8e6b8e3500763715dd0 |
| linux | linux | >= 9d56aced21fb9c104e8a3f3be9b21fbafe448ffc < 8ae6c15fc473c9ad03b0173330cce9a092c76154 | 8ae6c15fc473c9ad03b0173330cce9a092c76154 |
| linux | linux | >= bbe7bd722bfaea36aab3da6cc60fb4a05c644643 < 6522d59fb7de55ce0f0f285d962243ddffebb01f | 6522d59fb7de55ce0f0f285d962243ddffebb01f |
| linux | linux_kernel | — | — |