CVE-2026-43461 Linux内核DMA映射错误处理漏洞

/* * PoC for CVE-2026-43461: Linux Kernel Amlogic SPIFC DMA mapping bug * This is a conceptual stub to demonstrate triggering the error path. * Requires a vulnerable kernel version and specific hardware (Amlogic A4). */ #include <linux/module.h> #include <linux/spi/spi.h> #include <linux/dma-mapping.h> static int __init poc_init(void) { struct spi_device *spi; struct spi_transfer *xfer; // In a real scenario, logic to find the spifc-a4 device is needed. // The goal is to force a DMA setup failure, specifically the second mapping (info). printk(KERN_INFO "Attempting to trigger CVE-2026-43461\n"); // Hypothetical trigger: Force allocation failure or invalid address mapping // to hit the `out_map_info` error path. return 0; } static void __exit poc_exit(void) { printk(KERN_INFO "PoC unloaded\n"); } module_init(poc_init); module_exit(poc_exit); MODULE_LICENSE("GPL");