CVE-2026-31751 (GCVE-0-2026-31751)

Vulnerability from cvelistv5 – Published: 2026-05-01 14:14 – Updated: 2026-05-02 06:14
VLAI?
Title
comedi: dt2815: add hardware detection to prevent crash
Summary
In the Linux kernel, the following vulnerability has been resolved: comedi: dt2815: add hardware detection to prevent crash The dt2815 driver crashes when attached to I/O ports without actual hardware present. This occurs because syzkaller or users can attach the driver to arbitrary I/O addresses via COMEDI_DEVCONFIG ioctl. When no hardware exists at the specified port, inb() operations return 0xff (floating bus), but outb() operations can trigger page faults due to undefined behavior, especially under race conditions: BUG: unable to handle page fault for address: 000000007fffff90 #PF: supervisor write access in kernel mode #PF: error_code(0x0002) - not-present page RIP: 0010:dt2815_attach+0x6e0/0x1110 Add hardware detection by reading the status register before attempting any write operations. If the read returns 0xff, assume no hardware is present and fail the attach with -ENODEV. This prevents crashes from outb() operations on non-existent hardware.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: d6a929b7608ae157cef86d00cc580d1038f0b985 , < 8d63161837f1bf8810dbcd2a583c2bbf5ca6d733 (git)
Affected: d6a929b7608ae157cef86d00cc580d1038f0b985 , < d2a786efdb9971f2a647724625da5bbecc994dc9 (git)
Affected: d6a929b7608ae157cef86d00cc580d1038f0b985 , < 0dcf33994b8dcf3db36530fb7e2cf9f89e5cbac3 (git)
Affected: d6a929b7608ae157cef86d00cc580d1038f0b985 , < d5d9df8b08d68d083ac57abc2c887dfb1f31af63 (git)
Affected: d6a929b7608ae157cef86d00cc580d1038f0b985 , < 65c528fbeddd88478c210052f6c7b21be4973156 (git)
Affected: d6a929b7608ae157cef86d00cc580d1038f0b985 , < 34c8b3a91bdfbe4573650b4cd750ef639101fdc5 (git)
Affected: d6a929b7608ae157cef86d00cc580d1038f0b985 , < 34b13250c618d7441508c6ef369144aa8a9b9bfa (git)
Affected: d6a929b7608ae157cef86d00cc580d1038f0b985 , < 93853512f565e625df2397f0d8050d6aafd7c3ad (git)
Create a notification for this product.
    Linux Linux Affected: 2.6.30
Unaffected: 0 , < 2.6.30 (semver)
Unaffected: 5.10.253 , ≤ 5.10.* (semver)
Unaffected: 5.15.203 , ≤ 5.15.* (semver)
Unaffected: 6.1.168 , ≤ 6.1.* (semver)
Unaffected: 6.6.134 , ≤ 6.6.* (semver)
Unaffected: 6.12.81 , ≤ 6.12.* (semver)
Unaffected: 6.18.22 , ≤ 6.18.* (semver)
Unaffected: 6.19.12 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/comedi/drivers/dt2815.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "8d63161837f1bf8810dbcd2a583c2bbf5ca6d733",
              "status": "affected",
              "version": "d6a929b7608ae157cef86d00cc580d1038f0b985",
              "versionType": "git"
            },
            {
              "lessThan": "d2a786efdb9971f2a647724625da5bbecc994dc9",
              "status": "affected",
              "version": "d6a929b7608ae157cef86d00cc580d1038f0b985",
              "versionType": "git"
            },
            {
              "lessThan": "0dcf33994b8dcf3db36530fb7e2cf9f89e5cbac3",
              "status": "affected",
              "version": "d6a929b7608ae157cef86d00cc580d1038f0b985",
              "versionType": "git"
            },
            {
              "lessThan": "d5d9df8b08d68d083ac57abc2c887dfb1f31af63",
              "status": "affected",
              "version": "d6a929b7608ae157cef86d00cc580d1038f0b985",
              "versionType": "git"
            },
            {
              "lessThan": "65c528fbeddd88478c210052f6c7b21be4973156",
              "status": "affected",
              "version": "d6a929b7608ae157cef86d00cc580d1038f0b985",
              "versionType": "git"
            },
            {
              "lessThan": "34c8b3a91bdfbe4573650b4cd750ef639101fdc5",
              "status": "affected",
              "version": "d6a929b7608ae157cef86d00cc580d1038f0b985",
              "versionType": "git"
            },
            {
              "lessThan": "34b13250c618d7441508c6ef369144aa8a9b9bfa",
              "status": "affected",
              "version": "d6a929b7608ae157cef86d00cc580d1038f0b985",
              "versionType": "git"
            },
            {
              "lessThan": "93853512f565e625df2397f0d8050d6aafd7c3ad",
              "status": "affected",
              "version": "d6a929b7608ae157cef86d00cc580d1038f0b985",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/comedi/drivers/dt2815.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.30"
            },
            {
              "lessThan": "2.6.30",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.253",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.203",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.168",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.134",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.81",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.22",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.12",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.253",
                  "versionStartIncluding": "2.6.30",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.203",
                  "versionStartIncluding": "2.6.30",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.168",
                  "versionStartIncluding": "2.6.30",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.134",
                  "versionStartIncluding": "2.6.30",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.81",
                  "versionStartIncluding": "2.6.30",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.22",
                  "versionStartIncluding": "2.6.30",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19.12",
                  "versionStartIncluding": "2.6.30",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0",
                  "versionStartIncluding": "2.6.30",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncomedi: dt2815: add hardware detection to prevent crash\n\nThe dt2815 driver crashes when attached to I/O ports without actual\nhardware present. 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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-02T06:14:23.627Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "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"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-31751",
    "datePublished": "2026-05-01T14:14:43.551Z",
    "dateReserved": "2026-03-09T15:48:24.139Z",
    "dateUpdated": "2026-05-02T06:14:23.627Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-31751",
      "date": "2026-05-05",
      "epss": "0.00024",
      "percentile": "0.06806"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-31751\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-05-01T15:16:37.960\",\"lastModified\":\"2026-05-01T15:24:14.893\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\ncomedi: dt2815: add hardware detection to prevent crash\\n\\nThe dt2815 driver crashes when attached to I/O ports without actual\\nhardware present. 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.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0dcf33994b8dcf3db36530fb7e2cf9f89e5cbac3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/34b13250c618d7441508c6ef369144aa8a9b9bfa\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/34c8b3a91bdfbe4573650b4cd750ef639101fdc5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/65c528fbeddd88478c210052f6c7b21be4973156\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8d63161837f1bf8810dbcd2a583c2bbf5ca6d733\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/93853512f565e625df2397f0d8050d6aafd7c3ad\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d2a786efdb9971f2a647724625da5bbecc994dc9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d5d9df8b08d68d083ac57abc2c887dfb1f31af63\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.