CVE-2026-98170 (GCVE-0-2026-98170)
Vulnerability from cvelistv5
Published
2026-10-06 08:44
Modified
2026-10-21 12:54
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: smb: client: fix OOB struct field reads in move_smb2_ea_to_cifs() In move_smb2_ea_to_cifs(), the while (src_size > 0) loop condition is insufficient. It allows iteration to continue even if the remaining src_size is too small to contain a complete smb2_ea_info structure. Consequently, reads of ea_name_length and ea_value_length can occur out-of-bounds. Fix this by ensuring src_size >= sizeof(*src) before attempting to read any structure fields. Additionally, reject any next_entry_offset that is smaller than sizeof(*src) or that would advance the pointer beyond the available buffer. Note that for calls where the server returns a malformed EA list, the error returned to userspace changes from -ENODATA (getxattr) or -ERANGE (listxattr) to -EIO. This correctly signals a server protocol error rather than misleadingly indicating "attribute not present" or "output buffer too small".
References
Impacted products
Vendor Product Version
Linux Linux Version: 95907fea4fd8ccc736e0a428e52159b4d42b9958
Version: 95907fea4fd8ccc736e0a428e52159b4d42b9958
Version: 95907fea4fd8ccc736e0a428e52159b4d42b9958
Version: 95907fea4fd8ccc736e0a428e52159b4d42b9958
Version: 95907fea4fd8ccc736e0a428e52159b4d42b9958
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/smb/client/smb2ops.c",
            "fs/smb/client/trace.h"
          ],
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        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/smb/client/smb2ops.c",
            "fs/smb/client/trace.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.14"
            },
            {
              "lessThan": "4.14",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.160",
              "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",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.160",
                  "versionStartIncluding": "4.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.112",
                  "versionStartIncluding": "4.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3",
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                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: fix OOB struct field reads in move_smb2_ea_to_cifs()\n\nIn move_smb2_ea_to_cifs(), the while (src_size \u003e 0) loop condition is\ninsufficient. It allows iteration to continue even if the remaining\nsrc_size is too small to contain a complete smb2_ea_info structure.\nConsequently, reads of ea_name_length and ea_value_length can occur\nout-of-bounds.\n\nFix this by ensuring src_size \u003e= sizeof(*src) before attempting to read\nany structure fields. Additionally, reject any next_entry_offset that is\nsmaller than sizeof(*src) or that would advance the pointer beyond the\navailable buffer.\n\nNote that for calls where the server returns a malformed EA list, the\nerror returned to userspace changes from -ENODATA (getxattr) or\n-ERANGE (listxattr) to -EIO. This correctly signals a server protocol\nerror rather than misleadingly indicating \"attribute not present\" or\n\"output buffer too small\"."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-21T12:54:48.314Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/61812323c037a94e2e7f0db7ee740c34b126bffe"
        },
        {
          "url": "https://git.kernel.org/stable/c/d3546cecbf81d98bf3b472d341f981eb48c04f47"
        },
        {
          "url": "https://git.kernel.org/stable/c/34a3942e787b9c59758115bd65fe1ec89d68c7a4"
        },
        {
          "url": "https://git.kernel.org/stable/c/13efcd37a9b3d6ffa1579c3dda3e29c893ed9bca"
        },
        {
          "url": "https://git.kernel.org/stable/c/eeb5ef6083e1cefa2ef75041b5597ff228b8d7bb"
        }
      ],
      "title": "smb: client: fix OOB struct field reads in move_smb2_ea_to_cifs()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98170",
    "datePublished": "2026-10-06T08:44:15.138Z",
    "dateReserved": "2026-09-25T10:25:14.322Z",
    "dateUpdated": "2026-10-21T12:54:48.314Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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