CVE-2026-23443: Linux内核ACPI处理器释放后使用漏洞

/* * Conceptual PoC for CVE-2026-23443 * This demonstrates the vulnerable logic flow in acpi_processor_errata_piix4(). * Triggering this requires specific hardware or kernel emulation. */ #include <linux/acpi.h> #include <linux/device.h> // Vulnerable function simulation void vulnerable_acpi_processor_errata_piix4(struct device *dev) { // ... some logic ... // 1. Drop reference to the device object put_device(dev); // 2. Use-after-free: Dereferencing the pointer after dropping the reference // This is the vulnerable part described in the CVE. if (dev->kobj.sd) { printk(KERN_DEBUG "Device still exists (UAF trigger)"); } } /* * Exploitation Logic: * 1. Attacker gains local access (PR:L). * 2. Attacker triggers ACPI processor enumeration/scan. * 3. Kernel executes the vulnerable path, causing a race or crash. */