FKIE_CVE-2026-72310

Vulnerability from fkie_nvd - Published: 2026-08-15 06:22 - Updated: 2026-10-16 19:17
Severity
8.1 (High) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: smb: client: fix overflow in passthrough ioctl bounds check smb2_ioctl_query_info() validates the PASSTHRU_FSCTL response payload before copying it to userspace. The payload offset and length both come from 32-bit fields. The bounds check currently adds OutputOffset and qi.input_buffer_length directly, so the addition can wrap in 32-bit arithmetic before the result is compared against the response buffer length. A malicious server can use a large OutputOffset and a small OutputCount to make the wrapped sum pass the bounds check. The later copy_to_user() then reads from io_rsp + OutputOffset, outside the response buffer. Use size_add() for the offset plus length check so overflow is treated as out of bounds.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/160045fc943f6c46b227644261252c8a22b8a87a
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1627e7d5c9b09721a141d07cedb178882f1ded67
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/175357ee0c596cb82054650dfa32fda51ad35aaa
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1a638c55f2db6cb2296e5e3138015dd8fd9d4aa9
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/63feb687e89a3a52a31e6e01764117cc500f1974
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a4f27ad055392fa164f5649e89a3637b033c5fcc
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b30771b69eafae750afb7385fbcc3d77ed3f3670
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/dbd126539c098dba3159ce7d34b10b2daddcbd0f
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/smb/client/smb2ops.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "175357ee0c596cb82054650dfa32fda51ad35aaa",
              "status": "affected",
              "version": "2b1116bbe898aefdf584838448c6869f69851e0f",
              "versionType": "git"
            },
            {
              "lessThan": "dbd126539c098dba3159ce7d34b10b2daddcbd0f",
              "status": "affected",
              "version": "2b1116bbe898aefdf584838448c6869f69851e0f",
              "versionType": "git"
            },
            {
              "lessThan": "63feb687e89a3a52a31e6e01764117cc500f1974",
              "status": "affected",
              "version": "2b1116bbe898aefdf584838448c6869f69851e0f",
              "versionType": "git"
            },
            {
              "lessThan": "160045fc943f6c46b227644261252c8a22b8a87a",
              "status": "affected",
              "version": "2b1116bbe898aefdf584838448c6869f69851e0f",
              "versionType": "git"
            },
            {
              "lessThan": "b30771b69eafae750afb7385fbcc3d77ed3f3670",
              "status": "affected",
              "version": "2b1116bbe898aefdf584838448c6869f69851e0f",
              "versionType": "git"
            },
            {
              "lessThan": "1627e7d5c9b09721a141d07cedb178882f1ded67",
              "status": "affected",
              "version": "2b1116bbe898aefdf584838448c6869f69851e0f",
              "versionType": "git"
            },
            {
              "lessThan": "1a638c55f2db6cb2296e5e3138015dd8fd9d4aa9",
              "status": "affected",
              "version": "2b1116bbe898aefdf584838448c6869f69851e0f",
              "versionType": "git"
            },
            {
              "lessThan": "a4f27ad055392fa164f5649e89a3637b033c5fcc",
              "status": "affected",
              "version": "2b1116bbe898aefdf584838448c6869f69851e0f",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "2005c32ec99ee2490e8131b3953f3f212009ffea",
              "versionType": "git"
            },
            {
              "lessThan": "5.5",
              "status": "affected",
              "version": "5.4.69",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/smb/client/smb2ops.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.5"
            },
            {
              "lessThan": "5.5",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.261",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.212",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.178",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.145",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.97",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.40",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: fix overflow in passthrough ioctl bounds check\n\nsmb2_ioctl_query_info() validates the PASSTHRU_FSCTL response payload\nbefore copying it to userspace.\n\nThe payload offset and length both come from 32-bit fields. The bounds\ncheck currently adds OutputOffset and qi.input_buffer_length directly, so\nthe addition can wrap in 32-bit arithmetic before the result is compared\nagainst the response buffer length.\n\nA malicious server can use a large OutputOffset and a small OutputCount\nto make the wrapped sum pass the bounds check. The later copy_to_user()\nthen reads from io_rsp + OutputOffset, outside the response buffer.\n\nUse size_add() for the offset plus length check so overflow is treated as\nout of bounds."
    }
  ],
  "id": "CVE-2026-72310",
  "lastModified": "2026-10-16T19:17:21.573",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 8.1,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 5.2,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-72310",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-10-16T18:46:23.070703Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-08-15T06:22:03.777",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/160045fc943f6c46b227644261252c8a22b8a87a"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/1627e7d5c9b09721a141d07cedb178882f1ded67"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/175357ee0c596cb82054650dfa32fda51ad35aaa"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/1a638c55f2db6cb2296e5e3138015dd8fd9d4aa9"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/63feb687e89a3a52a31e6e01764117cc500f1974"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/a4f27ad055392fa164f5649e89a3637b033c5fcc"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/b30771b69eafae750afb7385fbcc3d77ed3f3670"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/dbd126539c098dba3159ce7d34b10b2daddcbd0f"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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