usb: gadget: uvc: fix dangling pointers in uvc_function_bind() and uvc_function_unbind()

Summary

In the Linux kernel, the following vulnerability has been resolved: usb: gadget: uvc: fix dangling pointers in uvc_function_bind() and uvc_function_unbind() In uvc_function_bind() error path, we use usb_ep_free_request which uses uvc->control_req but does not set it to NULL afterwards. Thus, uvc->control_req is a dangling pointer causing a UAF. Also we do not set the uvc->control_buf pointer to NULL after freeing it, which is another dangling pointer. Fix it by setting uvc->control_req to NULL after we run usb_ep_free_request() and uvc->control_buf to NULL after kfree. Do the same for uvc_function_unbind().

Timeline

1. Sep 11, 2026, 7:46 PM UTCCVE published
2. Oct 19, 2026, 8:51 AM UTCRecord last updated

Affected versions

• Linux Linux

  From 0f9df939385527049c8062a099fbfa1479fe7ce0 · fixed in ddb1b0d5d858584ed0d3a5aaa042ee693998c7e2; From 0f9df939385527049c8062a099fbfa1479fe7ce0 · fixed in 85dd5e8bd6776d02854f2847d83429f1f712e99c; From 0f9df939385527049c8062a099fbfa1479fe7ce0 · fixed in 502a7f5b79b7ba751988789e982924f8f496129f; From 0f9df939385527049c8062a099fbfa1479fe7ce0 · fixed in bec7708eb3b5295d12e931db24381b7c94c72953; From 0f9df939385527049c8062a099fbfa1479fe7ce0 · fixed in 8e88ed8a374de67270d38689f2a81018909cafbb; From 0f9df939385527049c8062a099fbfa1479fe7ce0 · fixed in 9897b7da8c0ad8356c1b8649379fcb5a689462cb; From 0f9df939385527049c8062a099fbfa1479fe7ce0 · fixed in 38f822ddce9355893d734279a26ddec45182197e; From 0f9df939385527049c8062a099fbfa1479fe7ce0 · fixed in bdab5605259ba5d6ff927c1a85cc83eb3ecfdacc; From 3.2.36 · fixed in 3.3; From 3.4.25 · fixed in 3.5; From 3.7.2 · fixed in 3.8

• Linux Linux

  3.8

• KernelLinux

  From 3.8.0 · fixed in 5.10.270; From 5.11.0 · fixed in 5.15.221; From 5.16.0 · fixed in 6.1.188; From 6.2.0 · fixed in 6.6.157; From 6.7.0 · fixed in 6.12.109; From 6.13.0 · fixed in 6.18.50; From 6.19.0 · fixed in 7.2.4

References 8