What’s Vulnerable › Vulnerabilities

CVE-2026-90019: usb: gadget: fix null pointer dereference in usb_put_function_instance()

• Severity: unknown
• 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: 2026-09-16 · updated 2026-10-19

Description

In the Linux kernel, the following vulnerability has been resolved: usb: gadget: fix null pointer dereference in usb_put_function_instance() usb_put_function_instance() attempts to dereference fd inside fi struct to get mod in uvc_alloc_inst() error path. However, fd is not allocated until later in try_get_usb_function_instance() after allocating fi in uvc_alloc_inst() and thus guranteed to be null in error path. Fix this by adding a null check for fi->fd that returns if fd is null.

Affected products

• Linux kernel: 3.9 — fixed in 7.3

How to fix

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

References

• https://git.kernel.org/stable/c/0fc54a00954f9f4c3e3d4ffa64a530685d99a39b
• https://git.kernel.org/stable/c/3a9691fff79bcce95338435599df6d3ae433cfdc
• https://git.kernel.org/stable/c/5117f236e9e30744338b425395d55913c4500897
• https://git.kernel.org/stable/c/6e6736c049683380f5e20becde498986e9293ca4
• https://git.kernel.org/stable/c/6e74ac5c596fd246e37eadfc354567179ccbe9aa
• https://git.kernel.org/stable/c/6ea3a073ca97716d4a73df49a3bec1c3ccf8e2a0
• https://git.kernel.org/stable/c/7a4f4ca7ff32ae24807c83e2a06d62b13378d53c
• https://git.kernel.org/stable/c/d3a7fa61997db3bf6dadef4c1bd87a4fa782a817

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