CVSS 5.5 · Medium EPSS 0,13%
Kerentanan Improper Locking pada linux kernel. Skor CVSS 3.1 5.5 (Medium) menurut NVD.
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.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
· uraikan di kalkulator | Vendor | Produk | Versi terdampak |
|---|---|---|
| linux | linux kernel | Versi 6.1.168 hingga sebelum 6.1.175 |
| linux | linux kernel | Versi 6.6.131 hingga sebelum 6.6.140 |
| linux | linux kernel | Versi 6.12.80 hingga sebelum 6.12.88 |
| linux | linux kernel | Versi 6.18.21 hingga sebelum 6.18.30 |
| linux | linux kernel | Versi 6.19.11 hingga sebelum 7.0 |
| linux | linux kernel | Versi 7.0.1 hingga sebelum 7.0.7 |
| linux | linux kernel | Versi 7.0 |
| linux | linux kernel | Versi 7.0 rc6 |
| linux | linux kernel | Versi 7.0 rc7 |
| linux | linux kernel | Versi 7.1 rc1 |
| linux | linux kernel | Versi 7.1 rc2 |