CyberRota Analysis
AI-GeneratedThe vulnerability in the Linux kernel affects the `snp_filter_reserved_mem_regions()` function, which contains an off-by-one error that could lead to a heap buffer overflow when handling memory regions. This flaw allows for potential memory corruption, which could be exploited to execute arbitrary code or cause a denial of service. System administrators and developers managing Linux kernel-based systems should prioritize this issue to mitigate the risk of exploitation.
Original NVD Description
In the Linux kernel, the following vulnerability has been resolved: crypto: ccp - Fix snp_filter_reserved_mem_regions() off-by-one Sashiko notes: > regarding the bounds check in snp_filter_reserved_mem_regions() > called via walk_iomem_res_desc(): does the check > if ((range_list->num_elements * 16 + 8) > PAGE_SIZE) > allow an off-by-one heap buffer overflow? > > If range_list->num_elements is 255, 255 * 16 + 8 = 4088, which is <= 4096. > Writing range->base (8 bytes) fills 4088-4095, but writing range->page_count > (4 bytes) would write to 4096-4099, overflowing the kzalloc-allocated > PAGE_SIZE buffer. Fix this by accounting for the entry about to be written to, in addition to the entries that are already allocated.