Vulnerability-Lookup

GHSA-G4VC-RR66-6355

Vulnerability from github – Published: 2024-12-27 15:31 – Updated: 2025-11-03 21:31

Details

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

ksmbd: fix Out-of-Bounds Write in ksmbd_vfs_stream_write

An offset from client could be a negative value, It could allows to write data outside the bounds of the allocated buffer. Note that this issue is coming when setting 'vfs objects = streams_xattr parameter' in ksmbd.conf.

Severity

7.8 (High)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2024-56626"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-787"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-12-27T15:15:22Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix Out-of-Bounds Write in ksmbd_vfs_stream_write\n\nAn offset from client could be a negative value, It could allows\nto write data outside the bounds of the allocated buffer.\nNote that this issue is coming when setting\n\u0027vfs objects = streams_xattr parameter\u0027 in ksmbd.conf.",
  "id": "GHSA-g4vc-rr66-6355",
  "modified": "2025-11-03T21:31:56Z",
  "published": "2024-12-27T15:31:55Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-56626"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/164d3597d26d9acff5d5b8bc3208bdcca942dd6a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1aea5c9470be2c7129704fb1b9562b1e3e0576f8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/313dab082289e460391c82d855430ec8a28ddf81"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8cd7490fc0f268883e86e840cda5311257af69ca"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c5797f195c67132d061d29c57a7c6d30530686f0"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2024-56626 (GCVE-0-2024-56626)

Vulnerability from cvelistv5 – Published: 2024-12-27 14:51 – Updated: 2026-08-05 11:45

Title

ksmbd: fix Out-of-Bounds Write in ksmbd_vfs_stream_write

Summary

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix Out-of-Bounds Write in ksmbd_vfs_stream_write An offset from client could be a negative value, It could allows to write data outside the bounds of the allocated buffer. Note that this issue is coming when setting 'vfs objects = streams_xattr parameter' in ksmbd.conf.

Severity

8.8 (High)


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

7.8 (High)


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

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2025-10-01 20:00 UTC

CWE

CWE-787 - Out-of-bounds Write

Assigner

Linux mitre root Scorecard

References

6 references

URL	Tags
https://git.kernel.org/stable/c/1aea5c9470be2c712…
https://git.kernel.org/stable/c/8cd7490fc0f268883…
https://git.kernel.org/stable/c/164d3597d26d9acff…
https://git.kernel.org/stable/c/c5797f195c67132d0…
https://git.kernel.org/stable/c/313dab082289e4603…
https://lists.debian.org/debian-lts-announce/2025…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 0626e6641f6b467447c81dd7678a69c66f7746cf , < 1aea5c9470be2c7129704fb1b9562b1e3e0576f8 (git) Affected: 0626e6641f6b467447c81dd7678a69c66f7746cf , < 8cd7490fc0f268883e86e840cda5311257af69ca (git) Affected: 0626e6641f6b467447c81dd7678a69c66f7746cf , < 164d3597d26d9acff5d5b8bc3208bdcca942dd6a (git) Affected: 0626e6641f6b467447c81dd7678a69c66f7746cf , < c5797f195c67132d061d29c57a7c6d30530686f0 (git) Affected: 0626e6641f6b467447c81dd7678a69c66f7746cf , < 313dab082289e460391c82d855430ec8a28ddf81 (git)
Linux	Linux	Affected: 5.15 Unaffected: 0 , < 5.15 (semver) Unaffected: 5.15.176 , ≤ 5.15.* (semver) Unaffected: 6.1.120 , ≤ 6.1.* (semver) Unaffected: 6.6.66 , ≤ 6.6.* (semver) Unaffected: 6.12.5 , ≤ 6.12.* (semver) Unaffected: 6.13 , ≤ * (original_commit_for_fix)

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JSON

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{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "LOCAL",
              "availabilityImpact": "HIGH",
              "baseScore": 7.8,
              "baseSeverity": "HIGH",
              "confidentialityImpact": "HIGH",
              "integrityImpact": "HIGH",
              "privilegesRequired": "LOW",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2024-56626",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2025-10-01T20:00:52.752066Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-787",
                "description": "CWE-787 Out-of-bounds Write",
                "lang": "en",
                "type": "CWE"
              }
            ]
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        ],
        "providerMetadata": {
          "dateUpdated": "2025-10-01T20:07:12.560Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      },
      {
        "providerMetadata": {
          "dateUpdated": "2025-11-03T20:51:15.360Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
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          "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": [
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              "status": "affected",
              "version": "0626e6641f6b467447c81dd7678a69c66f7746cf",
              "versionType": "git"
            },
            {
              "lessThan": "8cd7490fc0f268883e86e840cda5311257af69ca",
              "status": "affected",
              "version": "0626e6641f6b467447c81dd7678a69c66f7746cf",
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            },
            {
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          "vendor": "Linux",
          "versions": [
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              "version": "5.15"
            },
            {
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
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              "status": "unaffected",
              "version": "5.15.176",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.120",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.66",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.13",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "5.15",
                  "vulnerable": true
                },
                {
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                  "versionEndExcluding": "6.1.120",
                  "versionStartIncluding": "5.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.66",
                  "versionStartIncluding": "5.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.5",
                  "versionStartIncluding": "5.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.13",
                  "versionStartIncluding": "5.15",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix Out-of-Bounds Write in ksmbd_vfs_stream_write\n\nAn offset from client could be a negative value, It could allows\nto write data outside the bounds of the allocated buffer.\nNote that this issue is coming when setting\n\u0027vfs objects = streams_xattr parameter\u0027 in ksmbd.conf."
        }
      ],
      "metrics": [
        {
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - ksmbd is the in-kernel SMB server; smb2_write is reached by processing an SMB2 WRITE request received over TCP port 445 from a remote client.\nAC:L - The attacker simply sets req-\u003eOffset to a negative 64-bit value and supplies the write payload; the out-of-bounds write triggers reliably with no race or uncontrollable precondition.\nPR:L - The path requires a completed authenticated SMB session, a writable tree connect, and an open file handle with write access, so a valid (even low-privilege) SMB account is needed\u2014it is not a pre-auth handshake path.\nUI:N - Exploitation is fully driven by attacker-sent SMB2 packets and requires no action from any local user or victim.\nS:U - The out-of-bounds write corrupts kernel heap memory within the kernel\u0027s own security authority; no security boundary such as a VM or IOMMU is crossed.\nC:H - The attacker-controlled heap out-of-bounds write primitive can corrupt adjacent kernel structures and be leveraged into arbitrary memory disclosure.\nI:H - The client controls the negative offset, length, and content, producing a controlled out-of-bounds heap write suitable for arbitrary write and control-flow hijacking.\nA:H - Writing attacker-controlled data before a heap allocation reliably corrupts kernel memory, causing oops/panic and denial of service."
            }
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      "providerMetadata": {
        "dateUpdated": "2026-08-05T11:45:31.355Z",
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        },
        {
          "url": "https://git.kernel.org/stable/c/313dab082289e460391c82d855430ec8a28ddf81"
        }
      ],
      "title": "ksmbd: fix Out-of-Bounds Write in ksmbd_vfs_stream_write",
      "x_generator": {
        "engine": "bippy-1.2.0"
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2024-56626",
    "datePublished": "2024-12-27T14:51:29.078Z",
    "dateReserved": "2024-12-27T14:03:06.017Z",
    "dateUpdated": "2026-08-05T11:45:31.355Z",
    "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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
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-G4VC-RR66-6355

CVE-2024-56626 (GCVE-0-2024-56626)

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