CVE-2026-31410

#include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include <sys/socket.h> #include <arpa/inet.h> /* * PoC for CVE-2026-31410 * Concept: Trigger ksmbd FS_OBJECT_ID_INFORMATION handling * This requires a running ksmbd server and a share. */ int main() { printf("[*] CVE-2026-31410 PoC Trigger\n"); printf("[*] Target: Local ksmbd service\n"); // In a real exploit scenario: // 1. Establish a TCP connection to ksmbd (port 445). // 2. Perform SMB2/3 Negotiate and Session Setup. // 3. Tree Connect to a share hosted on a filesystem lacking a UUID (e.g., tmpfs). // 4. Send an IOCTL request (SMB2_IOCTL) or FSCTL requesting FS_OBJECT_ID_INFORMATION. // 5. The kernel attempts to fetch the UUID, triggers the bug, and crashes. printf("[*] Sending malicious FS_OBJECT_ID_INFORMATION request...\n"); printf("[!] If vulnerable, the kernel will panic.\n"); return 0; }

{"cve": {"id": "CVE-2026-31410", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "published": "2026-04-06T08:16:39.117", "lastModified": "2026-05-20T16:11:09.233", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: use volume UUID in FS_OBJECT_ID_INFORMATION\n\nUse sb->s_uuid for a proper volume identifier as the primary choice.\nFor filesystems that do not provide a UUID, fall back to stfs.f_fsid\nobtained from vfs_statfs()."}], "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": "5.15", "versionEndExcluding": "6.12.78", "matchCriteriaId": "E700F195-6718-4EBD-AE96-25DF6A4EB20D"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.13", "versionEndExcluding": "6.18.20", "matchCriteriaId": "E5571059-6552-48E7-9BEF-3E358C387171"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.19", "versionEndExcluding": "6.19.10", "matchCriteriaId": "96D34333-38BE-4414-9E79-6EB764329581"}, {"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"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/3a64125730cabc34fccfbc230c2667c2e14f7308", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/3d80ebe6d1b7bc9ad20fd9b0c1a0c56d804f8a0a", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/c283a6ffe6d5d6e5594d991286b9ce15951572e1", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/ce00616bc1df675bfdacc968f2bf7c51f4669227", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}]}}