What’s Vulnerable › Vulnerabilities

CVE-2026-89733: usb: gadget: uvc: fix dangling pointers in uvc_function_bind() and uvc_function_unbind()

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-11 · updated 2026-10-19

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().

Affected products

• Linux kernel: from 3.2.36 before 3.3; from 3.4.25 before 3.5; from 3.7.2 before 3.8; 3.8 — fixed in 3.3, 3.5, 3.8, 7.3

How to fix

Upgrade to a fixed version: Linux kernel 3.3, 3.5, 3.8, 7.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/38f822ddce9355893d734279a26ddec45182197e
• https://git.kernel.org/stable/c/502a7f5b79b7ba751988789e982924f8f496129f
• https://git.kernel.org/stable/c/85dd5e8bd6776d02854f2847d83429f1f712e99c
• https://git.kernel.org/stable/c/8e88ed8a374de67270d38689f2a81018909cafbb
• https://git.kernel.org/stable/c/9897b7da8c0ad8356c1b8649379fcb5a689462cb
• https://git.kernel.org/stable/c/bdab5605259ba5d6ff927c1a85cc83eb3ecfdacc
• https://git.kernel.org/stable/c/bec7708eb3b5295d12e931db24381b7c94c72953
• https://git.kernel.org/stable/c/ddb1b0d5d858584ed0d3a5aaa042ee693998c7e2

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