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This occurs because syzkaller or users can attach\nthe driver to arbitrary I/O addresses via COMEDI_DEVCONFIG ioctl.\n\nWhen no hardware exists at the specified port, inb() operations return\n0xff (floating bus), but outb() operations can trigger page faults due\nto undefined behavior, especially under race conditions:\n\n BUG: unable to handle page fault for address: 000000007fffff90\n #PF: supervisor write access in kernel mode\n #PF: error_code(0x0002) - not-present page\n RIP: 0010:dt2815_attach+0x6e0/0x1110\n\nAdd hardware detection by reading the status register before attempting\nany write operations. If the read returns 0xff, assume no hardware is\npresent and fail the attach with -ENODEV. This prevents crashes from\noutb() operations on non-existent hardware."}], "id": "CVE-2026-31751", "lastModified": "2026-05-07T19:11:00.483", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 4.7, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.0, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2026-05-01T15:16:37.960", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/0dcf33994b8dcf3db36530fb7e2cf9f89e5cbac3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/34b13250c618d7441508c6ef369144aa8a9b9bfa"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/34c8b3a91bdfbe4573650b4cd750ef639101fdc5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/65c528fbeddd88478c210052f6c7b21be4973156"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8d63161837f1bf8810dbcd2a583c2bbf5ca6d733"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/93853512f565e625df2397f0d8050d6aafd7c3ad"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d2a786efdb9971f2a647724625da5bbecc994dc9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d5d9df8b08d68d083ac57abc2c887dfb1f31af63"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-362"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: comedi: dt2815: add hardware detection to prevent crash", "id": "2464497", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2464497"}, "csaw": false, "cwe": "CWE-166", "details": ["A flaw was found in the Linux kernel's comedi dt2815 driver. A local user can exploit this vulnerability by attaching the driver to arbitrary I/O addresses without actual hardware present. This can trigger a page fault during output operations on non-existent hardware, leading to a kernel crash. This issue results in a denial of service."], "name": "CVE-2026-31751", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-05-01T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-31751\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-31751\nhttps://lore.kernel.org/linux-cve-announce/2026050142-CVE-2026-31751-f6c7@gregkh/T"]}

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