CVE-2026-31661 Linux内核brcmsmac驱动DMA释放漏洞

/* * PoC Concept for CVE-2026-31661 * This module attempts to trigger the brcmsmac DMA free bug. * Compile with: make -C /lib/modules/$(uname -r)/build M=$(pwd) modules */ #include <linux/module.h> #include <linux/kernel.h> #include <linux/netdevice.h> // Trigger logic would involve interacting with the wireless device // to force DMA allocation and subsequent free operations. // Specific hardware interaction is required. static int __init poc_init(void) { printk(KERN_INFO "CVE-2026-31661 PoC: Loading module to test brcmsmac DMA handling.\n"); // Real exploitation requires specific hardware (brcmsmac) present. return 0; } static void __exit poc_exit(void) { printk(KERN_INFO "CVE-2026-31661 PoC: Unloading module.\n"); } module_init(poc_init); module_exit(poc_exit); MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("PoC for brcmsmac dma_free_coherent size mismatch");