Vulnerability-Lookup

GHSA-4WFQ-6XP5-VP47

Vulnerability from github – Published: 2026-01-13 18:31 – Updated: 2026-07-30 06:32

Details

In the Linux kernel, the following vulnerability has been resolved:

ksmbd: fix buffer validation by including null terminator size in EA length

The smb2_set_ea function, which handles Extended Attributes (EA), was performing buffer validation checks that incorrectly omitted the size of the null terminating character (+1 byte) for EA Name. This patch fixes the issue by explicitly adding '+ 1' to EaNameLength where the null terminator is expected to be present in the buffer, ensuring the validation accurately reflects the total required buffer size.

Severity

7.5 (High)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

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{
  "affected": [],
  "aliases": [
    "CVE-2025-68806"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-01-13T16:16:02Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix buffer validation by including null terminator size in EA length\n\nThe smb2_set_ea function, which handles Extended Attributes (EA),\nwas performing buffer validation checks that incorrectly omitted the size\nof the null terminating character (+1 byte) for EA Name.\nThis patch fixes the issue by explicitly adding \u0027+ 1\u0027 to EaNameLength where\nthe null terminator is expected to be present in the buffer, ensuring\nthe validation accurately reflects the total required buffer size.",
  "id": "GHSA-4wfq-6xp5-vp47",
  "modified": "2026-07-30T06:32:28Z",
  "published": "2026-01-13T18:31:04Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-68806"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6dc8cf6e7998ef7aeb9383a4c2904ea5d22fa2e4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/95d7a890e4b03e198836d49d699408fd1867cb55"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a28a375a5439eb474e9f284509a407efb479c925"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cae52c592a07e1d3fa3338a5f064a374a5f26750"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d26af6d14da43ab92d07bc60437c62901dc522e6"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2025-68806 (GCVE-0-2025-68806)

Vulnerability from cvelistv5 – Published: 2026-01-13 15:29 – Updated: 2026-08-05 12:11

Title

ksmbd: fix buffer validation by including null terminator size in EA length

Summary

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix buffer validation by including null terminator size in EA length The smb2_set_ea function, which handles Extended Attributes (EA), was performing buffer validation checks that incorrectly omitted the size of the null terminating character (+1 byte) for EA Name. This patch fixes the issue by explicitly adding '+ 1' to EaNameLength where the null terminator is expected to be present in the buffer, ensuring the validation accurately reflects the total required buffer size.

Severity

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Assigner

Linux CNA under the mitre root

CNA scorecard D 54/100 over 6633 records in the last 180 days details

References

5 references

URL	Tags
https://git.kernel.org/stable/c/cae52c592a07e1d3f…
https://git.kernel.org/stable/c/a28a375a5439eb474…
https://git.kernel.org/stable/c/d26af6d14da43ab92…
https://git.kernel.org/stable/c/6dc8cf6e7998ef7ae…
https://git.kernel.org/stable/c/95d7a890e4b03e198…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: d070c4dd2a5bed4e9832eec5b6c029c7d14892ea , < cae52c592a07e1d3fa3338a5f064a374a5f26750 (git) Affected: 0ba5439d9afa2722e7728df56f272c89987540a4 , < a28a375a5439eb474e9f284509a407efb479c925 (git) Affected: 0ba5439d9afa2722e7728df56f272c89987540a4 , < d26af6d14da43ab92d07bc60437c62901dc522e6 (git) Affected: 0ba5439d9afa2722e7728df56f272c89987540a4 , < 6dc8cf6e7998ef7aeb9383a4c2904ea5d22fa2e4 (git) Affected: 0ba5439d9afa2722e7728df56f272c89987540a4 , < 95d7a890e4b03e198836d49d699408fd1867cb55 (git) Affected: bb5bf157b5be1643cccc7cbbe57fcdef9ae52c2c (git) Affected: 1a13ecb96230e8b7b91967e292836f7b01ec8111 (git) Affected: 404e7c01e16288b5e0171d1d8fd3328e806d0794 (git) Affected: 6.1.52 , < 6.1.160 (semver) Affected: 5.15.131 , < 5.16 (semver) Affected: 6.4.15 , < 6.5 (semver) Affected: 6.5.2 , < 6.6 (semver)
Linux	Linux	Affected: 6.6 Unaffected: 0 , < 6.6 (semver) Unaffected: 6.1.160 , ≤ 6.1.* (semver) Unaffected: 6.6.120 , ≤ 6.6.* (semver) Unaffected: 6.12.64 , ≤ 6.12.* (semver) Unaffected: 6.18.3 , ≤ 6.18.* (semver) Unaffected: 6.19 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/smb/server/smb2pdu.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "cae52c592a07e1d3fa3338a5f064a374a5f26750",
              "status": "affected",
              "version": "d070c4dd2a5bed4e9832eec5b6c029c7d14892ea",
              "versionType": "git"
            },
            {
              "lessThan": "a28a375a5439eb474e9f284509a407efb479c925",
              "status": "affected",
              "version": "0ba5439d9afa2722e7728df56f272c89987540a4",
              "versionType": "git"
            },
            {
              "lessThan": "d26af6d14da43ab92d07bc60437c62901dc522e6",
              "status": "affected",
              "version": "0ba5439d9afa2722e7728df56f272c89987540a4",
              "versionType": "git"
            },
            {
              "lessThan": "6dc8cf6e7998ef7aeb9383a4c2904ea5d22fa2e4",
              "status": "affected",
              "version": "0ba5439d9afa2722e7728df56f272c89987540a4",
              "versionType": "git"
            },
            {
              "lessThan": "95d7a890e4b03e198836d49d699408fd1867cb55",
              "status": "affected",
              "version": "0ba5439d9afa2722e7728df56f272c89987540a4",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "bb5bf157b5be1643cccc7cbbe57fcdef9ae52c2c",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "1a13ecb96230e8b7b91967e292836f7b01ec8111",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "404e7c01e16288b5e0171d1d8fd3328e806d0794",
              "versionType": "git"
            },
            {
              "lessThan": "6.1.160",
              "status": "affected",
              "version": "6.1.52",
              "versionType": "semver"
            },
            {
              "lessThan": "5.16",
              "status": "affected",
              "version": "5.15.131",
              "versionType": "semver"
            },
            {
              "lessThan": "6.5",
              "status": "affected",
              "version": "6.4.15",
              "versionType": "semver"
            },
            {
              "lessThan": "6.6",
              "status": "affected",
              "version": "6.5.2",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/smb/server/smb2pdu.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.6"
            },
            {
              "lessThan": "6.6",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.160",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.120",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.64",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.3",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.19",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.160",
                  "versionStartIncluding": "6.1.52",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.120",
                  "versionStartIncluding": "6.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.64",
                  "versionStartIncluding": "6.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.3",
                  "versionStartIncluding": "6.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19",
                  "versionStartIncluding": "6.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "5.15.131",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "6.4.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "6.5.2",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix buffer validation by including null terminator size in EA length\n\nThe smb2_set_ea function, which handles Extended Attributes (EA),\nwas performing buffer validation checks that incorrectly omitted the size\nof the null terminating character (+1 byte) for EA Name.\nThis patch fixes the issue by explicitly adding \u0027+ 1\u0027 to EaNameLength where\nthe null terminator is expected to be present in the buffer, ensuring\nthe validation accurately reflects the total required buffer size."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - The flaw is reachable by a remote SMB2/3 client through ksmbd\u0027s SMB2 SET_INFO handler over TCP, normally port 445.\nAC:L - The client directly controls the EA lengths and contents, so one deterministic malformed request triggers the over-read without a race or an external condition.\nPR:N - Ksmbd supports passwordless guest sessions on guest-writable shares, where a remote client can obtain FILE_WRITE_EA access. Under the required highest-severity reasonable deployment, no prior privileges are needed.\nUI:N - The attacker can send the necessary SET_INFO and QUERY_INFO requests without any victim action.\nS:U - The disclosure affects the ksmbd host kernel and does not cross a separate virtualization, sandbox, or IOMMU security authority.\nC:H - The malformed EA stores an uninitialized receive-buffer byte in a user xattr that the client can query. Repeated requests with heap grooming can slowly disclose kernel heap contents, warranting high confidentiality impact under conservative scoring.\nI:N - The flaw does not corrupt kernel memory or provide a kernel write primitive; it only changes a user xattr that the client is already authorized to set.\nA:N - The receive allocation includes an extra tail byte, so the faulty copy reads uninitialized in-allocation data rather than faulting; no crash, hang, or resource exhaustion results."
            }
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        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:11:38.392Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/6dc8cf6e7998ef7aeb9383a4c2904ea5d22fa2e4"
        },
        {
          "url": "https://git.kernel.org/stable/c/95d7a890e4b03e198836d49d699408fd1867cb55"
        }
      ],
      "title": "ksmbd: fix buffer validation by including null terminator size in EA length",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-68806",
    "datePublished": "2026-01-13T15:29:13.797Z",
    "dateReserved": "2025-12-24T10:30:51.045Z",
    "dateUpdated": "2026-08-05T12:11:38.392Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

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The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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GHSA-4WFQ-6XP5-VP47

CVE-2025-68806 (GCVE-0-2025-68806)

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