CVE-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 concurrently and protected by RCU, so netdev_put() must happen after the RCU grace period.
Does this matter?
Lower severity and a low EPSS score (0.10%). Track it; it rarely justifies an emergency change on its own.
Description
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
- 5.5 MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 0.10% probability · 1th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-667
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/366c482965c673565ecb8bcfb15d5548f13a6a10Patch
- https://git.kernel.org/stable/c/3df75fff46b1517eb479d8e6b8e3500763715dd0Patch
- https://git.kernel.org/stable/c/6522d59fb7de55ce0f0f285d962243ddffebb01fPatch
- https://git.kernel.org/stable/c/8ae6c15fc473c9ad03b0173330cce9a092c76154Patch
- https://git.kernel.org/stable/c/aa69918bd418e700309fdd08509dba324fb24296Patch
- https://git.kernel.org/stable/c/c741433f6c8dcdecd1d9549d89053761fd1ea413Patch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.