CVE-2026-43108

/* * PoC for CVE-2026-43108 * This code simulates sending a QMI message with a reason string * longer than the maximum defined length (65 bytes) to trigger the crash. */ #include <stdio.h> #include <stdlib.h> #include <string.h> // Mocking the QMI header and request structure typedef struct { uint32_t msg_id; uint32_t len; } qmi_header; #define MAX_REASON_LEN 81 // The length that causes the crash (> 65) int main() { printf("[+] CVE-2026-43108 PoC Trigger\n"); printf("[+] Target: Linux Kernel pd-mapper (servreg_loc_pfr_req)\n"); // Simulate crafting the malicious payload // In a real scenario, this would be sent via the QMI port char *malicious_reason = malloc(MAX_REASON_LEN); memset(malicious_reason, 'A', MAX_REASON_LEN - 1); malicious_reason[MAX_REASON_LEN - 1] = '\0'; printf("[+] Crafting request with reason length: %d\n", MAX_REASON_LEN); printf("[+] Payload Reason: %s\n", malicious_reason); // The vulnerability occurs when the kernel decodes this: // qmi_decode_string_elem: String len 81 >= Max Len 65 printf("[!] Sending payload to pd-mapper service...\n"); printf("[!] Expected result: PD Mapper Crash (DoS)\n"); free(malicious_reason); return 0; }

{"cve": {"id": "CVE-2026-43108", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "published": "2026-05-06T10:16:24.460", "lastModified": "2026-05-11T17:27:25.167", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsoc: qcom: pd-mapper: Fix element length in servreg_loc_pfr_req_ei\n\nIt looks element length declared in servreg_loc_pfr_req_ei for reason\nnot matching servreg_loc_pfr_req's reason field due which we could\nobserve decoding error on PD crash.\n\n qmi_decode_string_elem: String len 81 >= Max Len 65\n\nFix this by matching with servreg_loc_pfr_req's reason field."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "baseScore": 5.5, "baseSeverity": "MEDIUM", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.8, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "NVD-CWE-noinfo"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.11", "versionEndExcluding": "6.12.83", "matchCriteriaId": "ABF3F6D0-27D6-43E7-BF38-1B493B03EC1F"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.13", "versionEndExcluding": "6.18.24", "matchCriteriaId": "8126B8B8-6D0B-4443-86C1-672AEE893555"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.19", "versionEndExcluding": "6.19.14", "matchCriteriaId": "D6A8A074-BBF4-4803-ABED-519A839435BB"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*", "matchCriteriaId": "F253B622-8837-4245-BCE5-A7BF8FC76A16"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*", "matchCriteriaId": "4AE85AD8-4641-4E7C-A2F4-305E2CD9EE64"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*", "matchCriteriaId": "F666C8D8-6538-46D4-B318-87610DE64C34"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:*", "matchCriteriaId": "02259FDA-961B-47BC-AE7F-93D7EC6E90C2"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:*", "matchCriteriaId": "58A9FEFF-C040-420D-8F0A-BFDAAA1DF258"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:*", "matchCriteriaId": "1D2315C0-D46F-4F85-9754-F9E5E11374A6"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc7:*:*:*:*:*:*", "matchCriteriaId": "512EE3A8-A590-4501-9A94-5D4B268D6138"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/641f6fda143b879da1515f821ee475073678cf2a", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/7d75145672cf2ec7c5417e3243af72c48314f7bb", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/c93ca7c5a72e23a83a0b96f7f5c41a7a72f1dc47", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/cba84132c2ac7c08b215ce4962bc6f522c08a88c", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}]}}