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CVE-2022-49907

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: net: mdio: fix undefined behavior in bit shift for __mdiobus_register Shifting signed 32-bit value by 31 bits is undefined, so…

Published May 1, 2025EPSS 0.23%

Overview

CVE-2022-49907 is a high-severity vulnerability. It was published on May 1, 2025 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

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

net: mdio: fix undefined behavior in bit shift for __mdiobus_register

Shifting signed 32-bit value by 31 bits is undefined, so changing

significant bit to unsigned. The UBSAN warning calltrace like below:

UBSAN: shift-out-of-bounds in drivers/net/phy/mdio_bus.c:586:27

left shift of 1 by 31 places cannot be represented in type 'int'

Call Trace:

<TASK>

dump_stack_lvl+0x7d/0xa5

dump_stack+0x15/0x1b

ubsan_epilogue+0xe/0x4e

__ubsan_handle_shift_out_of_bounds+0x1e7/0x20c

__mdiobus_register+0x49d/0x4e0

fixed_mdio_bus_init+0xd8/0x12d

do_one_initcall+0x76/0x430

kernel_init_freeable+0x3b3/0x422

kernel_init+0x24/0x1e0

ret_from_fork+0x1f/0x30

</TASK>

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/20ed01a7b9af6e6a3c33761eebbb710ea6dd49b7Refgit.kernel.org/stable/c/40e4eb324c59e11fcb927aa46742d28aba6ecb8aRefgit.kernel.org/stable/c/4954b5359eb141499492fadfab891e28905509e2Refgit.kernel.org/stable/c/634f066d02bdb22a26da7deb0c7617ab1a65fc9dRefgit.kernel.org/stable/c/6ce6f8f8f6316da6f92afe7490bc2f0b654d68e0Refgit.kernel.org/stable/c/7006176a3c863e3e353ce1b8a349ef5bb1b9320eRefgit.kernel.org/stable/c/985a88bf0b27193522bba7856b1763f428cef19dRefgit.kernel.org/stable/c/a3fafc974be37319679f36dc4e7cca7db1e02973

How CyberStrike helps

Frequently asked questions

What is CVE-2022-49907?

CVE-2022-49907 is a high-severity vulnerability. It was published on May 1, 2025 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2022-49907?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2022-49907?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2022-49907?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2022-49907 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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