CVE-2026-31571

/* * PoC for CVE-2026-31571: Trigger i915 plane state clobber * Compile: gcc -o poc_cve2026_31571 poc_cve2026_31571.c -ldrm * Usage: ./poc_cve2026_31571 */ #include <fcntl.h> #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <sys/ioctl.h> #include <drm/drm.h> #include <drm/drm_fourcc.h> // Conceptual PoC to demonstrate the trigger sequence int main(int argc, char **argv) { int drm_fd; const char *device = "/dev/dri/card0"; printf("[+] Opening device: %s\n", device); drm_fd = open(device, O_RDWR); if (drm_fd < 0) { perror("[-] Failed to open device"); return 1; } printf("[+] Device opened successfully. FD: %d\n", drm_fd); printf("[+] Attempting to trigger atomic plane state change...\n"); // NOTE: Full exploitation requires constructing a specific DRM_IOCTL_MODE_ATOMIC // request that configures a plane as NV12 first, then reconfigures it // as a normal plane (e.g., XRGB8888) in a way that triggers the // plane_atomic_check() -> unlink_nv12_plane() race/order bug. // This skeleton demonstrates the necessary context. struct drm_mode_atomic atomic_req = {0}; // Setup flags and props here... (omitted for brevity as it depends on specific HW) // Step 1: Set plane to NV12 (Y-plane) // Step 2: Re-set plane to Normal format // Result: Kernel WARN/Oops due to state clobbering printf("[!] This PoC is a demonstration of the trigger logic.\n"); printf("[!] Exploitation requires specific hardware support and detailed property setup.\n"); close(drm_fd); return 0; }

{"cve": {"id": "CVE-2026-31571", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "published": "2026-04-24T15:16:31.653", "lastModified": "2026-04-27T20:33:43.247", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/i915: Unlink NV12 planes earlier\n\nunlink_nv12_plane() will clobber parts of the plane state\npotentially already set up by plane_atomic_check(), so we\nmust make sure not to call the two in the wrong order.\nThe problem happens when a plane previously selected as\na Y plane is now configured as a normal plane by user space.\nplane_atomic_check() will first compute the proper plane\nstate based on the userspace request, and unlink_nv12_plane()\nlater clears some of the state.\n\nThis used to work on account of unlink_nv12_plane() skipping\nthe state clearing based on the plane visibility. But I removed\nthat check, thinking it was an impossible situation. Now when\nthat situation happens unlink_nv12_plane() will just WARN\nand proceed to clobber the state.\n\nRather than reverting to the old way of doing things, I think\nit's more clear if we unlink the NV12 planes before we even\ncompute the new plane state.\n\n(cherry picked from commit 017ecd04985573eeeb0745fa2c23896fb22ee0cc)"}], "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": "6.15.1", "versionEndExcluding": "6.18.21", "matchCriteriaId": "36BA90C1-6493-4928-A360-8DF69289C352"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.19", "versionEndExcluding": "6.19.11", "matchCriteriaId": "4CA2E747-A9EC-4518-9AA2-B4247FC748B7"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:6.15:-:*:*:*:*:*:*", "matchCriteriaId": "A1ECC65A-EE37-4479-8E99-4BB68A22A31F"}, {"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/12f3b6cbab8fbeb95097685b40f0147406cf9746", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/70e2eb91cb6310a3508439f6f2539dfffa0abf77", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/bfa71b7a9dc6b5b8af157686e03308291141d00c", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}]}}