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CVE-2022-48804 is an integer-underflow flaw in the Linux kernel virtual-terminal ioctl activation path, specifically vt_setactivate. The code applied array_index_nospec to an out-of-bounds vsa.console value before decrementing it. Because array_index_nospec transiently converts an invalid index to zero, the subsequent decrement can transiently underflow the unsigned value. The correction decrements vsa.console first and subsequently constrains the resulting index with array_index_nospec.
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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.
Unknown
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.
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