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Review reviewHigh

CVE-2025-38736

Linux Linux, SIMATIC CN 4100, SIMATIC S7-1500 CPU 1518-4 PN/DP MFP

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
EPSS
0.15%
4.88% percentile
CISA KEV
Not listed
Published
2025.09.06
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.15%
Technical severityCVSS 7.1

Vulnerability overview

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 product and versions

Product
Linux Linux, SIMATIC CN 4100, SIMATIC S7-1500 CPU 1518-4 PN/DP MFP
Affected versions
>= 75947d3200de98a9ded9ad8972e02f1a177097fe < fcb4ce9f729c1d08e53abf9d449340e24c3edee6, >= 59ed6fbdb1bc03316e09493ffde7066f031c7524 < 8f141f2a4f2ef8ca865d5921574c3d6535e00a49, >= ccef5ee4adf56472aa26bdd1f821a6d0cd06089a < 748da80831221ae24b4bc8d7ffb22acd5712a341, >= ee2cd40b0bb46056949a2319084a729d95389386 < 22042ffedd8c2c6db08ccdd6d4273068eddd3c5c, >= ad1f8313aeec0115f9978bd2d002ef4a8d96c773 < 523eab02fce458fa6d3c51de5bb055800986953e, >= 4faff70959d51078f9ee8372f8cff0d7045e4114 < 24ef2f53c07f273bad99173e27ee88d44d135b1c, >= a754ab53993b1585132e871c5d811167ad3c52ff, >= 6.15.11 < 6.16, >= 6.12.43 < 6.12.44, >= 6.16.2 < 6.16.4, < V5.0, >= V3.1.6, 6.12.43, 6.17, 11.0
Fixed versions
6.16, 6.16.4

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux Linux, SIMATIC CN 4100, SIMATIC S7-1500 CPU 1518-4 PN/DP MFP and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
CWE
CWE-125