High severity · published Sep 5, 2025
CVE-2025-38736
net: usb: asix_devices: Fix PHY address mask in MDIO bus initialization
7.1
CVSS
0.2%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 7% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
KE
Kernel · Linux
6.15.11 before 6.16; 6.16.2 before 6.16.4; 6.12.43; 6.17 · source: NVD
LI
Linux · Linux
75947d3200de98a9ded9ad8972e02f1a177097fe before fcb4ce9f729c1d08e53abf9d449340e24c3edee6; 59ed6fbdb1bc03316e09493ffde7066f031c7524 before 8f141f2a4f2ef8ca865d5921574c3d6535e00a49; ccef5ee4adf56472aa26bdd1f821a6d0cd06089a before 748da80831221ae24b4bc8d7ffb22acd5712a341; ee2cd40b0bb46056949a2319084a729d95389386 before 22042ffedd8c2c6db08ccdd6d4273068eddd3c5c; ad1f8313aeec0115f9978bd2d002ef4a8d96c773 before 523eab02fce458fa6d3c51de5bb055800986953e; 4faff70959d51078f9ee8372f8cff0d7045e4114 before 24ef2f53c07f273bad99173e27ee88d44d135b1c; +4 more · source: vendor
DL
Debian Linux · Debian
11.0 · source: NVD
SC
SIMATIC CN 4100 · Siemens
before V5.0 · source: CISA
SS
SIMATIC S7-1500 CPU 1518-4 PN/DP MFP · Siemens
V3.1.6; V3.1.7; V3.1.6; V3.1.7 · source: CISA
SS
SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP · Siemens
V3.1.6; V3.1.7; V3.1.6; V3.1.7 · source: CISA
SS
SIPLUS S7-1500 CPU 1518-4 PN/DP MFP · Siemens
V3.1.6; V3.1.7 · source: CISA
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-38736
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-38736
Patch
https://git.kernel.org/stable/c/22042ffedd8c2c6db08ccdd6d4273068eddd3c5c
Patch
https://git.kernel.org/stable/c/24ef2f53c07f273bad99173e27ee88d44d135b1c
Patch
https://git.kernel.org/stable/c/523eab02fce458fa6d3c51de5bb055800986953e
Patch
https://git.kernel.org/stable/c/748da80831221ae24b4bc8d7ffb22acd5712a341
Patch
https://git.kernel.org/stable/c/8f141f2a4f2ef8ca865d5921574c3d6535e00a49
Patch
https://git.kernel.org/stable/c/fcb4ce9f729c1d08e53abf9d449340e24c3edee6
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