Linux Kernel up to 6.0.7 net mdio_bus.c __mdiobus_register out-of-bounds

Summaryinfo

A vulnerability, which was classified as problematic, was found in Linux Kernel up to 6.0.7. Affected is the function __mdiobus_register of the file drivers/net/phy/mdio_bus.c of the component net. Such manipulation leads to out-of-bounds. This vulnerability is traded as CVE-2022-49907. There is no exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in Linux Kernel up to 6.0.7. Affected by this issue is the function __mdiobus_register of the file drivers/net/phy/mdio_bus.c of the component net. The manipulation with an unknown input leads to a out-of-bounds vulnerability. Using CWE to declare the problem leads to CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. Impacted is confidentiality. CVE summarizes:

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>

The advisory is shared for download at git.kernel.org. This vulnerability is handled as CVE-2022-49907 since 05/01/2025. The exploitation is known to be difficult. There are known technical details, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 240793 (SUSE SLES12 Security Update : kernel (SUSE-SU-2025:01983-1)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 4.9.333, 4.14.299, 4.19.265, 5.4.224, 5.10.154, 5.15.78 or 6.0.8 eliminates this vulnerability. Applying the patch 20ed01a7b9af6e6a3c33761eebbb710ea6dd49b7/7006176a3c863e3e353ce1b8a349ef5bb1b9320e/a3fafc974be37319679f36dc4e7cca7db1e02973/4954b5359eb141499492fadfab891e28905509e2/634f066d02bdb22a26da7deb0c7617ab1a65fc9d/985a88bf0b27193522bba7856b1763f428cef19d/6ce6f8f8f6316da6f92afe7490bc2f0b654d68e0/40e4eb324c59e11fcb927aa46742d28aba6ecb8a is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at Tenable (240793). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 4.9.332
• 4.14.298
• 4.19.264
• 5.4.223
• 5.10.153
• 5.15.0
• 5.15.1
• 5.15.2
• 5.15.3
• 5.15.4
• 5.15.5
• 5.15.6
• 5.15.7
• 5.15.8
• 5.15.9
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• 5.15.25
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• 5.15.30
• 5.15.31
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• 5.15.33
• 5.15.34
• 5.15.35
• 5.15.36
• 5.15.37
• 5.15.38
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• 5.15.58
• 5.15.59
• 5.15.60
• 5.15.61
• 5.15.62
• 5.15.63
• 5.15.64
• 5.15.65
• 5.15.66
• 5.15.67
• 5.15.68
• 5.15.69
• 5.15.70
• 5.15.71
• 5.15.72
• 5.15.73
• 5.15.74
• 5.15.75
• 5.15.76
• 5.15.77
• 6.0.0
• 6.0.1
• 6.0.2
• 6.0.3
• 6.0.4
• 6.0.5
• 6.0.6
• 6.0.7

License

• open-source

Website

• Vendor: https://www.kernel.org/

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Entryinfo

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