CVE-2026-43243

/* * PoC for CVE-2026-43243 (Conceptual) * This code demonstrates how to interact with the DRM device * to potentially trigger the missing signal type check. */ #include <fcntl.h> #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <sys/ioctl.h> // Standard DRM ioctl definitions would be included here // For demonstration purposes, we assume the existence of relevant structures #define DRM_IOCTL_MODE_ATOMIC 0xc0 int main(int argc, char **argv) { int fd; const char *device = "/dev/dri/card0"; // Open the DRM device fd = open(device, O_RDWR); if (fd < 0) { perror("Failed to open device"); return EXIT_FAILURE; } printf("Attempting to trigger vulnerability in dcn401_get_phyd32clk_src...\n"); /* * In a real exploit scenario, specific atomic mode-setting requests * would be crafted to force the driver into the DPIA link path * without proper signal type checking. */ // Placeholder for the actual IOCTL call that triggers the bug // ioctl(fd, DRM_IOCTL_MODE_ATOMIC, ...); close(fd); printf("PoC execution finished.\n"); return EXIT_SUCCESS; }

{"cve": {"id": "CVE-2026-43243", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "published": "2026-05-06T12:16:44.720", "lastModified": "2026-05-11T14:16:58.187", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amd/display: Add signal type check for dcn401 get_phyd32clk_src\n\nTrying to access link enc on a dpia link will cause a crash otherwise"}], "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": "6.12.75", "matchCriteriaId": "A05DCA5C-0E7E-47B5-899A-41DDF296199E"}, {"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/23e7150afc70da615857f9f07b494ec58540f096", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/486b2909ac284185900c06f05ffc6eca895f38b8", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/c979d8db7b0f293111f2e83795ea353c8ed75de9", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/e332112255afbce02db67760f5743a1b13aa8541", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}]}}