CVE-2022-49907: Linux Kernel

High severity, CVSS 7.8. EPSS: 0.2% chance of exploitation in the next 30 days.

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 products

• Linux Linux Kernel: from 2.6.28, before 4.9.333 (fixed in 4.9.333); from 4.10, before 4.14.299 (fixed in 4.14.299); from 4.15, before 4.19.265 (fixed in 4.19.265); from 4.20, before 5.4.224 (fixed in 5.4.224); from 5.5, before 5.10.154 (fixed in 5.10.154); from 5.11, before 5.15.78 (fixed in 5.15.78); …

Published 2025-05-01. Last modified 2026-06-17.