CVE-2026-31751

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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."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/comedi/drivers/dt2815.c"], "versions": [{"version": "d6a929b7608ae157cef86d00cc580d1038f0b985", "lessThan": "8d63161837f1bf8810dbcd2a583c2bbf5ca6d733", "status": "affected", "versionType": "git"}, {"version": "d6a929b7608ae157cef86d00cc580d1038f0b985", "lessThan": "d2a786efdb9971f2a647724625da5bbecc994dc9", "status": "affected", "versionType": "git"}, {"version": "d6a929b7608ae157cef86d00cc580d1038f0b985", "lessThan": "0dcf33994b8dcf3db36530fb7e2cf9f89e5cbac3", "status": "affected", "versionType": "git"}, {"version": "d6a929b7608ae157cef86d00cc580d1038f0b985", "lessThan": "d5d9df8b08d68d083ac57abc2c887dfb1f31af63", "status": "affected", "versionType": "git"}, {"version": "d6a929b7608ae157cef86d00cc580d1038f0b985", "lessThan": "65c528fbeddd88478c210052f6c7b21be4973156", "status": "affected", "versionType": "git"}, {"version": "d6a929b7608ae157cef86d00cc580d1038f0b985", "lessThan": "34c8b3a91bdfbe4573650b4cd750ef639101fdc5", "status": "affected", "versionType": "git"}, {"version": "d6a929b7608ae157cef86d00cc580d1038f0b985", "lessThan": "34b13250c618d7441508c6ef369144aa8a9b9bfa", "status": "affected", "versionType": "git"}, {"version": "d6a929b7608ae157cef86d00cc580d1038f0b985", "lessThan": "93853512f565e625df2397f0d8050d6aafd7c3ad", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/comedi/drivers/dt2815.c"], "versions": [{"version": "2.6.30", "status": "affected"}, {"version": "0", "lessThan": "2.6.30", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.253", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.203", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.168", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.134", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.81", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.22", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.19.12", "lessThanOrEqual": "6.19.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.30", "versionEndExcluding": "5.10.253"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.30", "versionEndExcluding": "5.15.203"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.30", "versionEndExcluding": "6.1.168"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.30", "versionEndExcluding": "6.6.134"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.30", "versionEndExcluding": "6.12.81"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.30", "versionEndExcluding": "6.18.22"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.30", "versionEndExcluding": "6.19.12"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.30", "versionEndExcluding": "7.0"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/8d63161837f1bf8810dbcd2a583c2bbf5ca6d733"}, {"url": "https://git.kernel.org/stable/c/d2a786efdb9971f2a647724625da5bbecc994dc9"}, {"url": "https://git.kernel.org/stable/c/0dcf33994b8dcf3db36530fb7e2cf9f89e5cbac3"}, {"url": "https://git.kernel.org/stable/c/d5d9df8b08d68d083ac57abc2c887dfb1f31af63"}, {"url": "https://git.kernel.org/stable/c/65c528fbeddd88478c210052f6c7b21be4973156"}, {"url": "https://git.kernel.org/stable/c/34c8b3a91bdfbe4573650b4cd750ef639101fdc5"}, {"url": "https://git.kernel.org/stable/c/34b13250c618d7441508c6ef369144aa8a9b9bfa"}, {"url": "https://git.kernel.org/stable/c/93853512f565e625df2397f0d8050d6aafd7c3ad"}], "title": "comedi: dt2815: add hardware detection to prevent crash", "x_generator": {"engine": "bippy-1.2.0"}}}}

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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."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\ncomedi: dt2815: a\u00f1adir detecci\u00f3n de hardware para prevenir un fallo\n\nEl controlador dt2815 falla cuando se adjunta a puertos de E/S sin hardware real presente. Esto ocurre porque syzkaller o los usuarios pueden adjuntar el controlador a direcciones de E/S arbitrarias a trav\u00e9s de COMEDI_DEVCONFIG ioctl.\n\nCuando no existe hardware en el puerto especificado, las operaciones inb() devuelven 0xff (bus flotante), pero las operaciones outb() pueden desencadenar fallos de p\u00e1gina debido a un comportamiento indefinido, especialmente bajo condiciones de carrera:\n\n BUG: incapaz de manejar fallo de p\u00e1gina para la direcci\u00f3n: 000000007fffff90\n #PF: acceso de escritura de supervisor en modo kernel\n #PF: c\u00f3digo_de_error(0x 0002) - p\u00e1gina no presente\n RIP: 0010:dt2815_attach+0x6e0/0x 1110\n\nA\u00f1adir detecci\u00f3n de hardware leyendo el registro de estado antes de intentar cualquier operaci\u00f3n de escritura. Si la lectura devuelve 0xff, asumir que no hay hardware presente y fallar la adjunci\u00f3n con -ENODEV. Esto previene fallos de operaciones outb() en hardware no existente."}], "id": "CVE-2026-31751", "lastModified": "2026-11-11T21:10:00.200", "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"]}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,8d63161837f1bf8810dbcd2a583c2bbf5ca6d733)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,d2a786efdb9971f2a647724625da5bbecc994dc9)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,0dcf33994b8dcf3db36530fb7e2cf9f89e5cbac3)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,d5d9df8b08d68d083ac57abc2c887dfb1f31af63)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,65c528fbeddd88478c210052f6c7b21be4973156)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,34c8b3a91bdfbe4573650b4cd750ef639101fdc5)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,34b13250c618d7441508c6ef369144aa8a9b9bfa)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,93853512f565e625df2397f0d8050d6aafd7c3ad)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.10.253,5.11.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.15.203,5.16.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.1.168,6.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.134,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.81,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.22,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.19.12,6.20.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.0,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-05-01T23:30:06.227787+00:00", "updated": "2026-05-07T20:45:22.141899+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}