CVE-2022-49907

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

HIGH

7.8

CVSS Score

Published: May 1, 2025 at 02:10 PM UTC

Updated: June 17, 2026 at 05:19 AM UTC

1 product affected across 1 vendorLinux Kernel

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Severity

HIGH7.8

Exploit prediction

EPSS 0.2%

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>

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel · Linux

95%

2.6.28 ≤ v < 4.14.2992.6.28 ≤ v < 4.19.2652.6.28 ≤ v < 4.9.3332.6.28 ≤ v < 5.10.1542.6.28 ≤ v < 5.15.782.6.28 ≤ v < 5.4.2242.6.28 ≤ v < 6.0.82.6.28 ≤ v < 6.14.10 ≤ v < 4.14.2994.15 ≤ v < 4.19.2654.20 ≤ v < 5.4.2245.11 ≤ v < 5.15.785.16 ≤ v < 6.0.85.5 ≤ v < 5.10.1542.6.284fd5f812c23c7deee6425f4a318e85c317cd1d6c6.1 rc1 6.1 rc2 6.1 rc3

Vendor states this is fixed in 20ed01a7b9af6e6a3c33761eebbb710ea6dd49b7 (fixed)

Vendor states this is fixed in 40e4eb324c59e11fcb927aa46742d28aba6ecb8a (fixed)

Vendor states this is fixed in 4954b5359eb141499492fadfab891e28905509e2 (fixed)

Vendor states this is fixed in 634f066d02bdb22a26da7deb0c7617ab1a65fc9d (fixed)

Vendor states this is fixed in 6ce6f8f8f6316da6f92afe7490bc2f0b654d68e0 (fixed)

Vendor states this is fixed in 7006176a3c863e3e353ce1b8a349ef5bb1b9320e (fixed)

Vendor states this is fixed in 985a88bf0b27193522bba7856b1763f428cef19d (fixed)

Vendor states this is fixed in a3fafc974be37319679f36dc4e7cca7db1e02973 (fixed)

Vendor states this is fixed in 2.6.28 (unaffected)

Vendor states this is fixed in 4.14.299 (unaffected)

Vendor states this is fixed in 4.19.265 (unaffected)

Vendor states this is fixed in 4.9.333 (unaffected)