usb: cdns3: fix use-after-free in cdns3_gadget_exit()

Summary

In the Linux kernel, the following vulnerability has been resolved: usb: cdns3: fix use-after-free in cdns3_gadget_exit() cdns3_gadget_start() arms two works on system_freezable_wq: pending_status_wq for the deferred ep0 status stage and aligned_buf_wq for realigned request buffers. Both handlers use the cdns3_device the works are embedded in, and cdns3_pending_setup_status_handler() also calls the ep0 request completion. cdns3_gadget_exit() does not wait for these works. It frees all endpoints and aligned buffers and drops the last reference to the gadget device, which frees priv_dev, so a work queued before the exit can run after the free. Fix this by waiting for both works after the gadget driver is unbound and the IRQ is freed, when no new work can be queued, and before the endpoints and buffers are released. This issue was found by an in-house static analysis tool.

Timeline

1. Oct 18, 2026, 3:47 PM UTCCVE published
2. Oct 21, 2026, 12:56 PM UTCRecord last updated

Affected versions

• Linux Linux

  From 7733f6c32e36ff9d7adadf40001039bf219b1cbe · fixed in efdf0ddaed01161dc1c1f25382856f2fd1c1f44f; From 7733f6c32e36ff9d7adadf40001039bf219b1cbe · fixed in cc448700db656cceb4b411bf99a2e7132144d035; From 7733f6c32e36ff9d7adadf40001039bf219b1cbe · fixed in 95160fe606e685ff18de1e6ddcbc08289476004e; From 7733f6c32e36ff9d7adadf40001039bf219b1cbe · fixed in 159dada48ee2d53eff46e66a8011d67b2c209bbc; From 7733f6c32e36ff9d7adadf40001039bf219b1cbe · fixed in ebe9b68c396792c15d0ac690d592e449e74ed804

• Linux Linux

  5.4

• KernelLinux

  From 5.4.0 · fixed in 6.6.160; From 6.7.0 · fixed in 6.12.113; From 6.13.0 · fixed in 6.18.56; From 6.19.0 · fixed in 7.2.10

References 5