CVE-2025-38111

net/mdiobus: Fix potential out-of-bounds read/write access

State: Published
Severity: 7.8 High
Published: Jul 3, 2025
Updated: Oct 15, 2026
Reserved: Apr 16, 2025

Description

In the Linux kernel, the following vulnerability has been resolved:

net/mdiobus: Fix potential out-of-bounds read/write access

When using publicly available tools like 'mdio-tools' to read/write data from/to network interface and its PHY via 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 array, where wrong address may allow out-of-bounds read/write.

Fix that by adding address verification before read/write operation. While this excludes this access from any statistics, it improves security of read/write operation.

Scores

CVSS	Score	Vector	Source
3.1	7.8 High	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	Linux

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	080bb352fad00d04995102f681b134e3754bfb6e to before 19c5875e26c4ed5686d82a7d8f7051385461b9ebAffected 080bb352fad00d04995102f681b134e3754bfb6e to before 014ad9210373d2104f6ef10e6bb999a7a0a4c50eAffected 080bb352fad00d04995102f681b134e3754bfb6e to before 73d478234a619f3476028cb02dee699c30ae8262Affected 080bb352fad00d04995102f681b134e3754bfb6e to before bab6bca0834cbb5be2a7cfe59ec6ad016ec72608Affected 080bb352fad00d04995102f681b134e3754bfb6e to before b02d9d2732483e670bc34cb233d28e1d43b15da4Affected 080bb352fad00d04995102f681b134e3754bfb6e to before 049af7ac45a6b407748ee0995278fd861e36df8fAffected 080bb352fad00d04995102f681b134e3754bfb6e to before 0e629694126ca388916f059453a1c36adde219c4Affected
LinuxLinux	5.6Affected before 5.6Not affected 5.10.239 through 5.10.Not affected 5.15.186 through 5.15.Not affected 6.1.142 through 6.1.Not affected 6.6.94 through 6.6.Not affected 6.12.34 through 6.12.Not affected 6.15.3 through 6.15.Not affected 6.16 and laterNot affected

Product

Versions

LinuxLinux

080bb352fad00d04995102f681b134e3754bfb6e to before 19c5875e26c4ed5686d82a7d8f7051385461b9ebAffected
080bb352fad00d04995102f681b134e3754bfb6e to before 014ad9210373d2104f6ef10e6bb999a7a0a4c50eAffected
080bb352fad00d04995102f681b134e3754bfb6e to before 73d478234a619f3476028cb02dee699c30ae8262Affected
080bb352fad00d04995102f681b134e3754bfb6e to before bab6bca0834cbb5be2a7cfe59ec6ad016ec72608Affected
080bb352fad00d04995102f681b134e3754bfb6e to before b02d9d2732483e670bc34cb233d28e1d43b15da4Affected
080bb352fad00d04995102f681b134e3754bfb6e to before 049af7ac45a6b407748ee0995278fd861e36df8fAffected
080bb352fad00d04995102f681b134e3754bfb6e to before 0e629694126ca388916f059453a1c36adde219c4Affected

LinuxLinux

5.6Affected
before 5.6Not affected
5.10.239 through 5.10.*Not affected
5.15.186 through 5.15.*Not affected
6.1.142 through 6.1.*Not affected
6.6.94 through 6.6.*Not affected
6.12.34 through 6.12.*Not affected
6.15.3 through 6.15.*Not affected
6.16 and laterNot affected

References

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