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CVE-2022-48804 is a flaw in the Linux kernel virtual-terminal ioctl activation path, in vt_setactivate. The code applied array_index_nospec to vsa.console before subtracting one to convert the user-supplied console number into a zero-based index. For an out-of-bounds value, array_index_nospec transiently yields zero; the subsequent decrement therefore transiently underflows the unsigned index. The fix decrements vsa.console before applying array_index_nospec, preventing the transient underflow.
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Linux kernel virtual-terminal ioctl array-index handling flaw.
Linux kernel vt_ioctl issue addressed by an array_index_nospec fix in vt_setactivate.
A Linux kernel vt_ioctl/vt_setactivate flaw in which applying array_index_nospec before decrementing vsa.console can cause a transient integer underflow. The fix decrements vsa.console before sanitizing it with array_index_nospec.
A moderate-severity local Linux kernel vt_ioctl/vt_setactivate vulnerability involving a transient integer underflow before bounds sanitization. It may permit unauthorized memory access or manipulation.
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