gve: prevent ethtool ops after shutdown

Summary

In the Linux kernel, the following vulnerability has been resolved: gve: prevent ethtool ops after shutdown A crash can occur if an ethtool operation is invoked after shutdown() is called. shutdown() is invoked during system shutdown to stop DMA operations without performing expensive deallocations. It is discouraged to unregister the netdev in this path, so the device may still be visible to userspace and kernel helpers. In gve, shutdown() tears down most internal data structures. If an ethtool operation is dispatched after shutdown(), it will dereference freed or NULL pointers, leading to a kernel panic. While graceful shutdown normally quiesces userspace before invoking the reboot syscall, forced shutdowns (as observed on GCP VMs) can still trigger this path. Fix by calling netif_device_detach() in shutdown(). This marks the device as detached so the ethtool ioctl handler will skip dispatching operations to the driver.

Timeline

1. Sep 5, 2025, 5:20 PM UTCCVE published
2. Oct 15, 2026, 9:53 PM UTCCISA SSVC assessment

   Exploitation: none · Automatable: no · Technical impact: total

3. Oct 15, 2026, 10:02 PM UTCRecord last updated

Affected versions

• Linux Linux

  From 974365e518617c9ce917f61aacbba07e4bedcca0 · fixed in 48a4e89d50e8ea52e800bc7865970b92fcf4647c; From 974365e518617c9ce917f61aacbba07e4bedcca0 · fixed in ba51d73408edf815cbaeab148625576c2dd90192; From 974365e518617c9ce917f61aacbba07e4bedcca0 · fixed in a7efffeecb881b4649fdc30de020ef910f35d646; From 974365e518617c9ce917f61aacbba07e4bedcca0 · fixed in 9d8a41e9a4ff83ff666de811e7f012167cdc00e9; From 974365e518617c9ce917f61aacbba07e4bedcca0 · fixed in 75a9a46d67f46d608205888f9b34e315c1786345

• Linux Linux

  5.17

• KernelLinux

  From 5.17.0 · fixed in 6.1.149; From 6.2.0 · fixed in 6.6.103; From 6.7.0 · fixed in 6.12.44; From 6.13.0 · fixed in 6.16.4

References 5