# CVE-2025-38736

## Summary

- **CVE ID:** CVE-2025-38736
- **Severity:** HIGH
- **CVSS Score:** 7.1 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H)
- **CWE:** N/A
- **Published:** Sep 5, 2025
- **Last Modified:** Sep 8, 2026

## Description

In the Linux kernel, the following vulnerability has been resolved:

net: usb: asix_devices: Fix PHY address mask in MDIO bus initialization

Syzbot reported shift-out-of-bounds exception on MDIO bus initialization.

The PHY address should be masked to 5 bits (0-31). Without this
mask, invalid PHY addresses could be used, potentially causing issues
with MDIO bus operations.

Fix this by masking the PHY address with 0x1f (31 decimal) to ensure
it stays within the valid range.

## Affected Products

- Linux — Linux (75947d3200de98a9ded9ad8972e02f1a177097fe)
- Linux — Linux (59ed6fbdb1bc03316e09493ffde7066f031c7524)
- Linux — Linux (ccef5ee4adf56472aa26bdd1f821a6d0cd06089a)
- Linux — Linux (ee2cd40b0bb46056949a2319084a729d95389386)
- Linux — Linux (ad1f8313aeec0115f9978bd2d002ef4a8d96c773)
- Linux — Linux (4faff70959d51078f9ee8372f8cff0d7045e4114)
- Linux — Linux (a754ab53993b1585132e871c5d811167ad3c52ff)
- Linux — Linux (6.12.43)
- Linux — Linux (6.16.2)
- Linux — Linux (6.15.11)

## References

- [CNA](https://git.kernel.org/stable/c/fcb4ce9f729c1d08e53abf9d449340e24c3edee6)
- [CNA](https://git.kernel.org/stable/c/8f141f2a4f2ef8ca865d5921574c3d6535e00a49)
- [CNA](https://git.kernel.org/stable/c/748da80831221ae24b4bc8d7ffb22acd5712a341)
- [CNA](https://git.kernel.org/stable/c/22042ffedd8c2c6db08ccdd6d4273068eddd3c5c)
- [CNA](https://git.kernel.org/stable/c/523eab02fce458fa6d3c51de5bb055800986953e)
- [CNA](https://git.kernel.org/stable/c/24ef2f53c07f273bad99173e27ee88d44d135b1c)
- [CVE](https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html)
- [siemens-SADP](https://cert-portal.siemens.com/productcert/html/ssa-032379.html)
- [siemens-SADP](https://cert-portal.siemens.com/productcert/html/ssa-019113.html)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.16%
- **EPSS Percentile:** 5.9

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-17._