High 7.1Published Sep 5, 2025

CVE-2025-38736net: usb: asix_devices: Fix PHY address mask in MDIO bus initialization

Updated under an hour ago (Oct 27, 2026, 12:30 PM ET)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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.

CVSS: 7.1 HIGH (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Oct 14, 2026
First seen by InfoSec Signals: Oct 14, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 75947d3200de98a9ded9ad8972e02f1a177097fe before fcb4ce9f729c1d08e53abf9d449340e24c3edee6; 59ed6fbdb1bc03316e09493ffde7066f031c7524 builds before 8f141f2a4f2ef8ca865d5921574c3d6535e00a49; from ccef5ee4adf56472aa26bdd1f821a6d0cd06089a before 748da80831221ae24b4bc8d7ffb22acd5712a341; from ee2cd40b0bb46056949a2319084a729d95389386 before 22042ffedd8c2c6db08ccdd6d4273068eddd3c5c; from ad1f8313aeec0115f9978bd2d002ef4a8d96c773 before 523eab02fce458fa6d3c51de5bb055800986953e; from 4faff70959d51078f9ee8372f8cff0d7045e4114 before 24ef2f53c07f273bad99173e27ee88d44d135b1c; a754ab53993b1585132e871c5d811167ad3c52ff; from 6.15.11 before 6.16	CNA record
Siemens SIMATIC CN 4100 siemens:simatic_cn_4100 (from the name)	before V5.0	CISA ADP
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518_4_pn_dp_mfp (from the name)	from V3.1.6	CISA ADP
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518f_4_pn_dp_mfp (from the name)	from V3.1.6	CISA ADP
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP siemens:siplus_s7_1500_cpu_1518_4_pn_dp_mfp (from the name)	from V3.1.6	CISA ADP
linux linux_kernel linux:linux_kernel	from 6.15.11 before 6.16; from 6.16.2 before 6.16.4; 6.12.43; 6.17	NVD
debian debian_linux debian:debian_linux	11.0	NVD

References

References

https://git.kernel.org/stable/c/fcb4ce9f729c1d08e53abf9d449340e24c3edee6	patch
https://git.kernel.org/stable/c/8f141f2a4f2ef8ca865d5921574c3d6535e00a49	patch
https://git.kernel.org/stable/c/748da80831221ae24b4bc8d7ffb22acd5712a341	patch
https://git.kernel.org/stable/c/22042ffedd8c2c6db08ccdd6d4273068eddd3c5c	patch
https://git.kernel.org/stable/c/523eab02fce458fa6d3c51de5bb055800986953e	patch
https://git.kernel.org/stable/c/24ef2f53c07f273bad99173e27ee88d44d135b1c	patch
https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html	third-party-advisory
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

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.