CVE-2026-98757

/// Technical description

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.

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References