Vulnerability-Lookup

FKIE_CVE-2024-26936

Vulnerability from fkie_nvd - Published: 2024-05-01 06:15 - Updated: 2026-08-04 11:17

Severity

8.2 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Summary

In the Linux kernel, the following vulnerability has been resolved: ksmbd: validate request buffer size in smb2_allocate_rsp_buf() The response buffer should be allocated in smb2_allocate_rsp_buf before validating request. But the fields in payload as well as smb2 header is used in smb2_allocate_rsp_buf(). This patch add simple buffer size validation to avoid potencial out-of-bounds in request buffer.

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/17cf0c2794bdb6f39671265aa18aea5c22ee8c4a	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/21ff9d7d223c5c19cb4334009e4c0c83a2f4d674	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/2c27a64a2bc47d9bfc7c3cf8be14be53b1ee7cb6	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/5c20b242d4fed73a93591e48bfd9772e2322fb11	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/8f3d0bf1d0c62b539d54c5b9108a845cff619b99	Patch
af854a3a-2127-422b-91ae-364da2661108	https://git.kernel.org/stable/c/17cf0c2794bdb6f39671265aa18aea5c22ee8c4a	Patch
af854a3a-2127-422b-91ae-364da2661108	https://git.kernel.org/stable/c/21ff9d7d223c5c19cb4334009e4c0c83a2f4d674	Patch
af854a3a-2127-422b-91ae-364da2661108	https://git.kernel.org/stable/c/2c27a64a2bc47d9bfc7c3cf8be14be53b1ee7cb6	Patch
af854a3a-2127-422b-91ae-364da2661108	https://git.kernel.org/stable/c/5c20b242d4fed73a93591e48bfd9772e2322fb11	Patch
af854a3a-2127-422b-91ae-364da2661108	https://git.kernel.org/stable/c/8f3d0bf1d0c62b539d54c5b9108a845cff619b99	Patch

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	6.9
linux	linux_kernel	6.9
linux	linux_kernel	6.9
linux	linux_kernel	6.9
linux	linux_kernel	6.9

JSON

To clipboard

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    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ksmbd: validar el tama\u00f1o del b\u00fafer de solicitud en smb2_allocate_rsp_buf() El b\u00fafer de respuesta debe asignarse en smb2_allocate_rsp_buf antes de validar la solicitud. Pero los campos en el payload y el encabezado smb2 se usan en smb2_allocate_rsp_buf(). Este parche agrega una validaci\u00f3n simple del tama\u00f1o del b\u00fafer para evitar posibles l\u00edmites en el b\u00fafer de solicitud."
    }
  ],
  "id": "CVE-2024-26936",
  "lastModified": "2026-08-04T11:17:23.800",
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}

CVE-2024-26936 (GCVE-0-2024-26936)

Vulnerability from cvelistv5 – Published: 2024-05-01 05:26 – Updated: 2026-08-05 11:28

Title

ksmbd: validate request buffer size in smb2_allocate_rsp_buf()

Summary

Severity

8.2 (High)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2024-05-10 18:35 UTC

Assigner

Linux CNA under the mitre root

CNA scorecard D 54/100 over 6618 records in the last 180 days details

References

5 references

URL	Tags
https://git.kernel.org/stable/c/8f3d0bf1d0c62b539…
https://git.kernel.org/stable/c/21ff9d7d223c5c19c…
https://git.kernel.org/stable/c/5c20b242d4fed73a9…
https://git.kernel.org/stable/c/2c27a64a2bc47d9bf…
https://git.kernel.org/stable/c/17cf0c2794bdb6f39…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 0626e6641f6b467447c81dd7678a69c66f7746cf , < 8f3d0bf1d0c62b539d54c5b9108a845cff619b99 (git) Affected: 0626e6641f6b467447c81dd7678a69c66f7746cf , < 21ff9d7d223c5c19cb4334009e4c0c83a2f4d674 (git) Affected: 0626e6641f6b467447c81dd7678a69c66f7746cf , < 5c20b242d4fed73a93591e48bfd9772e2322fb11 (git) Affected: 0626e6641f6b467447c81dd7678a69c66f7746cf , < 2c27a64a2bc47d9bfc7c3cf8be14be53b1ee7cb6 (git) Affected: 0626e6641f6b467447c81dd7678a69c66f7746cf , < 17cf0c2794bdb6f39671265aa18aea5c22ee8c4a (git)
Linux	Linux	Affected: 5.15 Unaffected: 0 , < 5.15 (semver) Unaffected: 5.15.159 , ≤ 5.15.* (semver) Unaffected: 6.1.88 , ≤ 6.1.* (semver) Unaffected: 6.6.29 , ≤ 6.6.* (semver) Unaffected: 6.8.8 , ≤ 6.8.* (semver) Unaffected: 6.9 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

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        "metrics": [
          {
            "other": {
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                "id": "CVE-2024-26936",
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                "timestamp": "2024-05-10T18:35:18.289818Z",
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.159",
                  "versionStartIncluding": "5.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.88",
                  "versionStartIncluding": "5.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.29",
                  "versionStartIncluding": "5.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.8.8",
                  "versionStartIncluding": "5.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.9",
                  "versionStartIncluding": "5.15",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: validate request buffer size in smb2_allocate_rsp_buf()\n\nThe response buffer should be allocated in smb2_allocate_rsp_buf\nbefore validating request. But the fields in payload as well as smb2 header\nis used in smb2_allocate_rsp_buf(). This patch add simple buffer size\nvalidation to avoid potencial out-of-bounds in request buffer."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.2,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - The vulnerable code is in ksmbd, the in-kernel SMB server processing requests received on TCP port 445; the OOB read is driven entirely by fields in a remotely supplied SMB2 packet, making it remotely reachable over the network.\nAC:L - A single crafted SMB2 QUERY_INFO / transform request deterministically triggers the field read on an undersized buffer, with no race or unpredictable precondition the attacker cannot control.\nPR:N - In the affected code smb2_allocate_rsp_buf() runs before init_rsp_hdr and before check_user_session, and in the original ordering before decryption/session lookup, so a crafted (transform) request reaches the OOB read pre-authentication\u2014consistent with the paired CVE-2024-26980.\nUI:N - The attacker sends the malformed request directly to the server; no action by any local user or victim is required.\nS:U - The out-of-bounds read stays within the kernel\u0027s own memory and security authority; no VM, hypervisor, IOMMU, or sandbox boundary is crossed.\nC:L - The read goes out of bounds by a couple of bytes (InfoType/FileInfoClass) of adjacent slab memory; it is strictly bounded to a few bytes and feeds only an internal size decision, so limited rather than arbitrary disclosure.\nI:N - The defect is purely an out-of-bounds read used to size the response buffer; there is no out-of-bounds write, freed-object reuse, or type confusion, so no data can be modified.\nA:H - Reading past a small slab allocation into a redzone or unmapped region produces a KASAN-detected slab-out-of-bounds and can oops/panic the kernel, and the request can be repeated at will, yielding a remote denial of service."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T11:28:27.772Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/8f3d0bf1d0c62b539d54c5b9108a845cff619b99"
        },
        {
          "url": "https://git.kernel.org/stable/c/21ff9d7d223c5c19cb4334009e4c0c83a2f4d674"
        },
        {
          "url": "https://git.kernel.org/stable/c/5c20b242d4fed73a93591e48bfd9772e2322fb11"
        },
        {
          "url": "https://git.kernel.org/stable/c/2c27a64a2bc47d9bfc7c3cf8be14be53b1ee7cb6"
        },
        {
          "url": "https://git.kernel.org/stable/c/17cf0c2794bdb6f39671265aa18aea5c22ee8c4a"
        }
      ],
      "title": "ksmbd: validate request buffer size in smb2_allocate_rsp_buf()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2024-26936",
    "datePublished": "2024-05-01T05:26:51.773Z",
    "dateReserved": "2024-02-19T14:20:24.196Z",
    "dateUpdated": "2026-08-05T11:28:27.772Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

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Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
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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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Action not permitted

FKIE_CVE-2024-26936

CVE-2024-26936 (GCVE-0-2024-26936)

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