What’s Vulnerable › Vulnerabilities
CVE-2025-38736: net: usb: asix_devices: Fix PHY address mask in MDIO bus initialization
- Severity: high (CVSS 7.1 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.2% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2025-09-05 · updated 2026-10-19
- Weakness: CWE-125
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
- Debian Linux: 11.0
- Linux kernel: from 6.15.11 before 6.16; from 6.16.2 before 6.16.4; 6.12.43, 6.17-rc2 — fixed in 6.16, 6.16.4
How to fix
Upgrade to a fixed version: Linux kernel 6.16, 6.16.4. Check the vendor advisory for mitigations.
References
- https://git.kernel.org/stable/c/22042ffedd8c2c6db08ccdd6d4273068eddd3c5c
- https://git.kernel.org/stable/c/24ef2f53c07f273bad99173e27ee88d44d135b1c
- https://git.kernel.org/stable/c/523eab02fce458fa6d3c51de5bb055800986953e
- https://git.kernel.org/stable/c/748da80831221ae24b4bc8d7ffb22acd5712a341
- https://git.kernel.org/stable/c/8f141f2a4f2ef8ca865d5921574c3d6535e00a49
- https://git.kernel.org/stable/c/fcb4ce9f729c1d08e53abf9d449340e24c3edee6
- https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html
- https://cert-portal.siemens.com/productcert/html/ssa-019113.html
- https://cert-portal.siemens.com/productcert/html/ssa-032379.html
- https://cert-portal.siemens.com/productcert/html/ssa-457936.html
Get alerted when CVE-2025-38736 or the next vulnerability affects your stack