Vulnerability-Lookup

FKIE_CVE-2025-37956

Vulnerability from fkie_nvd - Published: 2025-05-20 16:15 - Updated: 2026-07-30 06:22

Severity

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

Summary

In the Linux kernel, the following vulnerability has been resolved: ksmbd: prevent rename with empty string Client can send empty newname string to ksmbd server. It will cause a kernel oops from d_alloc. This patch return the error when attempting to rename a file or directory with an empty new name string.

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/53e3e5babc0963a92d856a5ec0ce92c59f54bc12	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/6ee551672c8cf36108b0cfba92ec0c7c28ac3439	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/c57301e332cc413fe0a7294a90725f4e21e9549d	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/d7f2c00acb1ef64304fd40ac507e9213ff1d9b5c	Patch

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	6.15
linux	linux_kernel	6.15
linux	linux_kernel	6.15
linux	linux_kernel	6.15
linux	linux_kernel	6.15

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "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": "6ee551672c8cf36108b0cfba92ec0c7c28ac3439",
              "status": "affected",
              "version": "0626e6641f6b467447c81dd7678a69c66f7746cf",
              "versionType": "git"
            },
            {
              "lessThan": "c57301e332cc413fe0a7294a90725f4e21e9549d",
              "status": "affected",
              "version": "0626e6641f6b467447c81dd7678a69c66f7746cf",
              "versionType": "git"
            },
            {
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              "versionType": "git"
            },
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              "version": "0626e6641f6b467447c81dd7678a69c66f7746cf",
              "versionType": "git"
            }
          ]
        },
        {
          "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": "5.15"
            },
            {
              "lessThan": "5.15",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
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              "status": "unaffected",
              "version": "6.6.91",
              "versionType": "semver"
            },
            {
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              "status": "unaffected",
              "version": "6.12.29",
              "versionType": "semver"
            },
            {
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              "status": "unaffected",
              "version": "6.14.7",
              "versionType": "semver"
            },
            {
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              "status": "unaffected",
              "version": "6.15",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "configurations": [
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        {
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              "matchCriteriaId": "A0BB0418-DE28-49B6-BEE6-5D5AA1D70BCF",
              "versionEndExcluding": "6.6.91",
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              "vulnerable": true
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              "criteria": "cpe:2.3:o:linux:linux_kernel:6.15:rc1:*:*:*:*:*:*",
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              "matchCriteriaId": "2D240580-3048-49B2-9E27-F115A9DF8224",
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          "negate": false,
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  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: prevent rename with empty string\n\nClient can send empty newname string to ksmbd server.\nIt will cause a kernel oops from d_alloc.\nThis patch return the error when attempting to rename\na file or directory with an empty new name string."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ksmbd: impide renombrar con una cadena vac\u00eda. El cliente puede enviar una cadena vac\u00eda de nombre nuevo al servidor ksmbd. Esto provocar\u00e1 un error de kernel desde d_alloc. Este parche devuelve el error al intentar renombrar un archivo o directorio con una cadena vac\u00eda de nombre nuevo."
    }
  ],
  "id": "CVE-2025-37956",
  "lastModified": "2026-07-30T06:22:37.317",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 8.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 5.9,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      },
      {
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          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2025-05-20T16:15:33.813",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/53e3e5babc0963a92d856a5ec0ce92c59f54bc12"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/6ee551672c8cf36108b0cfba92ec0c7c28ac3439"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
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    },
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    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-noinfo"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}

CVE-2025-37956 (GCVE-0-2025-37956)

Vulnerability from cvelistv5 – Published: 2025-05-20 16:01 – Updated: 2026-08-05 11:58

Title

ksmbd: prevent rename with empty string

Summary

Severity

8.8 (High)


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

Assigner

Linux mitre root

References

4 references

URL	Tags
https://git.kernel.org/stable/c/6ee551672c8cf3610…
https://git.kernel.org/stable/c/c57301e332cc413fe…
https://git.kernel.org/stable/c/d7f2c00acb1ef6430…
https://git.kernel.org/stable/c/53e3e5babc0963a92…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 0626e6641f6b467447c81dd7678a69c66f7746cf , < 6ee551672c8cf36108b0cfba92ec0c7c28ac3439 (git) Affected: 0626e6641f6b467447c81dd7678a69c66f7746cf , < c57301e332cc413fe0a7294a90725f4e21e9549d (git) Affected: 0626e6641f6b467447c81dd7678a69c66f7746cf , < d7f2c00acb1ef64304fd40ac507e9213ff1d9b5c (git) Affected: 0626e6641f6b467447c81dd7678a69c66f7746cf , < 53e3e5babc0963a92d856a5ec0ce92c59f54bc12 (git)
Linux	Linux	Affected: 5.15 Unaffected: 0 , < 5.15 (semver) Unaffected: 6.6.91 , ≤ 6.6.* (semver) Unaffected: 6.12.29 , ≤ 6.12.* (semver) Unaffected: 6.14.7 , ≤ 6.14.* (semver) Unaffected: 6.15 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "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": "6ee551672c8cf36108b0cfba92ec0c7c28ac3439",
              "status": "affected",
              "version": "0626e6641f6b467447c81dd7678a69c66f7746cf",
              "versionType": "git"
            },
            {
              "lessThan": "c57301e332cc413fe0a7294a90725f4e21e9549d",
              "status": "affected",
              "version": "0626e6641f6b467447c81dd7678a69c66f7746cf",
              "versionType": "git"
            },
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              "version": "0626e6641f6b467447c81dd7678a69c66f7746cf",
              "versionType": "git"
            },
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              "status": "affected",
              "version": "0626e6641f6b467447c81dd7678a69c66f7746cf",
              "versionType": "git"
            }
          ]
        },
        {
          "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": "5.15"
            },
            {
              "lessThan": "5.15",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.91",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.29",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.15",
              "versionType": "original_commit_for_fix"
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      "cpeApplicability": [
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                },
                {
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                },
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: prevent rename with empty string\n\nClient can send empty newname string to ksmbd server.\nIt will cause a kernel oops from d_alloc.\nThis patch return the error when attempting to rename\na file or directory with an empty new name string."
        }
      ],
      "metrics": [
        {
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            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - ksmbd is the in-kernel SMB server; the malformed FILE_RENAME_INFORMATION request arrives over TCP/445 (or SMB-Direct) from a remote client. No local access is involved.\nAC:L - The attacker deterministically triggers the uninitialized-qstr dereference by sending one SET_INFO request with FileNameLength=2 containing a UTF-16 NUL; no race or unpredictable precondition is required, and the stack residue that shapes the outcome is influenced by the attacker\u0027s own preceding requests on the same ksmbd worker.\nPR:L - smb2_set_info requires an established session, a tree connect to a writable share, and an open handle with FILE_DELETE access, so a low-privileged authenticated SMB account (or a guest-mapped session on guest-enabled shares) is needed. This matches sibling post-auth ksmbd CVEs such as CVE-2025-22040/22041.\nUI:N - The server processes the crafted rename request automatically in its worker thread; no action by any local user or administrator is needed.\nS:U - The wild read, dentry corruption and crash all occur within the kernel\u0027s own security authority; no VM, IOMMU or sandbox boundary is crossed.\nC:H - __d_alloc() memcpy\u0027s from an uninitialized kernel-stack pointer with an uncontrolled length \u2014 an unbounded out-of-bounds read whose contents become the new dentry name, which the attacker can then read back over SMB via directory enumeration, disclosing kernel heap/stack data and pointers.\nI:H - The rename completes against a target derived from uninitialized kernel memory and leaves a dentry cached with a bogus d_name.len driving later name-switching memcpy\u0027s; on 32-bit ksmbd builds the `size + name-\u003elen` computation in __d_alloc() overflows, producing an undersized allocation followed by a multi-gigabyte memcpy \u2014 a heap write primitive.\nA:H - The commit states the empty name causes a kernel oops from d_alloc; a remote client can repeat the request at will to keep panicking the server, so availability loss is total."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T11:58:38.144Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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        },
        {
          "url": "https://git.kernel.org/stable/c/53e3e5babc0963a92d856a5ec0ce92c59f54bc12"
        }
      ],
      "title": "ksmbd: prevent rename with empty string",
      "x_generator": {
        "engine": "bippy-1.2.0"
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    }
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-37956",
    "datePublished": "2025-05-20T16:01:49.865Z",
    "dateReserved": "2025-04-16T04:51:23.974Z",
    "dateUpdated": "2026-08-05T11:58:38.144Z",
    "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.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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FKIE_CVE-2025-37956

CVE-2025-37956 (GCVE-0-2025-37956)

Tags

Sightings

Nomenclature

Related by attack behaviour