CVE-2022-49907 in Linux
摘要
由 VulDB • 2026-07-12
在 Linux 内核中,已修复以下漏洞:
net: mdio: 修复 __mdiobus_register 中的位运算未定义行为
对带符号的 32 位值进行 31 位移位在 C/C++ 标准中属于未定义行为(Undefined Behavior),因此将有效位更改为无符号类型。UBSAN(Unsanitized Bounds Checker)警告调用栈如下所示:
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>
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