CVE-2026-23390 Linux内核DMA跟踪点缓冲区溢出漏洞

/* * PoC Concept: Calculate buffer size for dma_map_sg tracepoint * This demonstrates the condition that triggers the overflow. */ #include <stdio.h> #define PERF_MAX_TRACE_SIZE 8192 void calculate_trace_size(int nents) { // phys_addrs: nents * 8 bytes // dma_addrs: nents * 8 bytes // lengths: nents * 4 bytes size_t total_size = (nents * 8) + (nents * 8) + (nents * 4); printf("Entries: %d\n", nents); printf("Required Trace Size: %zu bytes\n", total_size); printf("Perf Max Trace Size: %d bytes\n", PERF_MAX_TRACE_SIZE); if (total_size > PERF_MAX_TRACE_SIZE) { printf("[!] VULNERABLE: Buffer overflow detected!\n"); } else { printf("[+] Safe: Size within limits.\n"); } } int main() { // Triggering condition mentioned in CVE description (nents > 1000) calculate_trace_size(1000); return 0; }