CVE-2026-89733

Published: September 15, 2026Last modified: September 15, 2026

Description

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().

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References

• https://git.kernel.org/stable/c/38f822ddce9355893d734279a26ddec45182197e
• https://git.kernel.org/stable/c/8e88ed8a374de67270d38689f2a81018909cafbb
• https://git.kernel.org/stable/c/9897b7da8c0ad8356c1b8649379fcb5a689462cb
• https://git.kernel.org/stable/c/bdab5605259ba5d6ff927c1a85cc83eb3ecfdacc