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Review reviewHigh

CVE-2025-38110

Linux Linux, linux kernel

In the Linux kernel, the following vulnerability has been resolved: net/mdiobus: Fix potential out-of-bounds clause 45 read/write access When using publicly available tools like 'mdio-tools' to read/write data from/to network interface and its PHY via C45 (clause 45) mdiobus, there is no verification of parameters passed to the ioctl and it accepts any mdio address. Currently there is support for 32 addresses in kernel via PHY_MAX_ADDR define, but it is possible to pass higher value than that via ioctl. While read/write operation should generally fail in this case, mdiobus provides stats ar...

CVSS
7.1
EPSS
0.17%
6.54% percentile
CISA KEV
Not listed
Published
2025.07.03
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.17%
Technical severityCVSS 7.1

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: net/mdiobus: Fix potential out-of-bounds clause 45 read/write access When using publicly available tools like 'mdio-tools' to read/write data from/to network interface and its PHY via C45 (clause 45) mdiobus, there is no verification of parameters passed to the ioctl and it accepts any mdio address. Currently there is support for 32 addresses in kernel via PHY_MAX_ADDR define, but it is possible to pass higher value than that via ioctl. While read/write operation should generally fail in this case, mdiobus provides stats ar...

Affected product and versions

Product
Linux Linux, linux kernel
Affected versions
>= 4e4aafcddbbfcdd6eed5780e190fcbfac8b4685a < abb0605ca00979a49572a6516f6db22c3dc57223, >= 4e4aafcddbbfcdd6eed5780e190fcbfac8b4685a < 31bf7b2b92563a352788cf9df3698682f659bacc, >= 4e4aafcddbbfcdd6eed5780e190fcbfac8b4685a < 4ded22f7f3ce9714ed72c3e9c68fea1cb9388ae7, >= 4e4aafcddbbfcdd6eed5780e190fcbfac8b4685a < 260388f79e94fb3026c419a208ece8358bb7b555, >= 6.3, >= 6.3 < 6.6.94, >= 6.7 < 6.12.34, >= 6.13 < 6.15.3, 6.16
Fixed versions
6.6.94, 6.12.34, 6.15.3

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux Linux, linux kernel 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