usbip: vhci_hcd: fix NULL deref in status_show_vhci

Summary

In the Linux kernel, the following vulnerability has been resolved: usbip: vhci_hcd: fix NULL deref in status_show_vhci platform_get_drvdata() can return NULL if a VHCI host controller's probe failed (e.g. due to USB bus number exhaustion). status_show_vhci() checked for a NULL pdev but not for a NULL hcd returned by platform_get_drvdata(). Passing NULL to hcd_to_vhci_hcd() does not return NULL - it returns a pointer offset of 0x260, causing a NULL pointer dereference when that value is subsequently dereferenced. Add a NULL check on hcd before calling hcd_to_vhci_hcd(). Move status_show_not_ready() above status_show_vhci() to make it callable from the new error path without a forward declaration.

Timeline

1. Sep 24, 2026, 4:04 PM UTCCVE published
2. Oct 3, 2026, 10:58 AM UTCRecord last updated

Affected versions

• Linux Linux

  From 0775a9cbc694e8c7276688be3bbd2f386167ab54 · fixed in 2b477ee5cc9c2670185ffd82911a20e1760008c2; From 0775a9cbc694e8c7276688be3bbd2f386167ab54 · fixed in 671d2687a790f63110c3c4213230209f5c3e0e8e; From 0775a9cbc694e8c7276688be3bbd2f386167ab54 · fixed in fd7d938ab4759a45eb107e658c199a2c47cc1ace; From 0775a9cbc694e8c7276688be3bbd2f386167ab54 · fixed in 517c353e5358b2123cbf620a1798fe632fb7bdce; From 0775a9cbc694e8c7276688be3bbd2f386167ab54 · fixed in 046a94fdb02eb1df86c8fa4614104ff801ba3ab7; From 0775a9cbc694e8c7276688be3bbd2f386167ab54 · fixed in dacd7c317ba12e035653c28a0eaaf23d91abc073; From 0775a9cbc694e8c7276688be3bbd2f386167ab54 · fixed in bc150783542ba2e7c1257d1299c6f3269bdba270

• Linux Linux

  4.9

• KernelLinux

  From 4.9.0 · fixed in 5.10.271; From 5.11.0 · fixed in 5.15.222; From 5.16.0 · fixed in 6.1.189; From 6.2.0 · fixed in 6.6.158; From 6.7.0 · fixed in 6.12.111; From 6.13.0 · fixed in 6.18.53

References 7