FKIE_CVE-2026-98167

Vulnerability from fkie_nvd - Published: 2026-10-06 09:17 - Updated: 2026-10-06 09:17
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved: smb: client: fix server->total_read for compound encrypted PDUs In receive_encrypted_standard(), server->total_read is left at the full decrypted frame size when walking sub-PDUs of a compound encrypted frame. As a result, cifs_handle_standard() passes this full size to smb2_check_message(), causing the PDU length guards to incorrectly validate the entire compound frame instead of the current sub-PDU. This allows truncated non-last sub-PDUs to bypass length validation, leading to out-of-bounds reads in smb2_get_data_area_len(). Fix this by setting server->total_read to the true length of the current sub-PDU: next_cmd for non-last sub-PDUs, and the remaining pdu_length for the last one.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/282b72f9a7ef31296c48366db4128882999cc048
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8703539d22fdbc13dd2db090ee199c3a427b8ea0
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a46eb242e9eef3a3897d166748b23303c516e870
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e78fc1d240b27349b45a0f1c3e3c2c401d7e230d
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ebb8a075fdc7af3d196a4f158a0e18dbc394c0e3
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f73726b83e4756fdaa099e1bc1143293bd57ad79
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": "8703539d22fdbc13dd2db090ee199c3a427b8ea0",
              "status": "affected",
              "version": "b24df3e30cbf48255db866720fb71f14bf9d2f39",
              "versionType": "git"
            },
            {
              "lessThan": "e78fc1d240b27349b45a0f1c3e3c2c401d7e230d",
              "status": "affected",
              "version": "b24df3e30cbf48255db866720fb71f14bf9d2f39",
              "versionType": "git"
            },
            {
              "lessThan": "a46eb242e9eef3a3897d166748b23303c516e870",
              "status": "affected",
              "version": "b24df3e30cbf48255db866720fb71f14bf9d2f39",
              "versionType": "git"
            },
            {
              "lessThan": "ebb8a075fdc7af3d196a4f158a0e18dbc394c0e3",
              "status": "affected",
              "version": "b24df3e30cbf48255db866720fb71f14bf9d2f39",
              "versionType": "git"
            },
            {
              "lessThan": "282b72f9a7ef31296c48366db4128882999cc048",
              "status": "affected",
              "version": "b24df3e30cbf48255db866720fb71f14bf9d2f39",
              "versionType": "git"
            },
            {
              "lessThan": "f73726b83e4756fdaa099e1bc1143293bd57ad79",
              "status": "affected",
              "version": "b24df3e30cbf48255db866720fb71f14bf9d2f39",
              "versionType": "git"
            }
          ]
        },
        {
          "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": "4.19"
            },
            {
              "lessThan": "4.19",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.189",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.158",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.112",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.54",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.8",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc4",
              "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 server-\u003etotal_read for compound encrypted PDUs\n\nIn receive_encrypted_standard(), server-\u003etotal_read is left at the\nfull decrypted frame size when walking sub-PDUs of a compound encrypted\nframe. As a result, cifs_handle_standard() passes this full size\nto smb2_check_message(), causing the PDU length guards to incorrectly\nvalidate the entire compound frame instead of the current sub-PDU.\n\nThis allows truncated non-last sub-PDUs to bypass length validation,\nleading to out-of-bounds reads in smb2_get_data_area_len().\n\nFix this by setting server-\u003etotal_read to the true length of the\ncurrent sub-PDU: next_cmd for non-last sub-PDUs, and the remaining\npdu_length for the last one."
    }
  ],
  "id": "CVE-2026-98167",
  "lastModified": "2026-10-06T09:17:58.177",
  "metrics": {},
  "published": "2026-10-06T09:17:58.177",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/282b72f9a7ef31296c48366db4128882999cc048"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/8703539d22fdbc13dd2db090ee199c3a427b8ea0"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/a46eb242e9eef3a3897d166748b23303c516e870"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/e78fc1d240b27349b45a0f1c3e3c2c401d7e230d"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/ebb8a075fdc7af3d196a4f158a0e18dbc394c0e3"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/f73726b83e4756fdaa099e1bc1143293bd57ad79"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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