Vulnerability-Lookup

GHSA-7VQW-4GWW-392J

Vulnerability from github – Published: 2026-01-13 18:31 – Updated: 2026-01-13 18:31

Details

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

ksmbd: skip lock-range check on equal size to avoid size==0 underflow

When size equals the current i_size (including 0), the code used to call check_lock_range(filp, i_size, size - 1, WRITE), which computes size - 1 and can underflow for size==0. Skip the equal case.

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{
  "affected": [],
  "aliases": [
    "CVE-2025-68786"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-01-13T16:15:58Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: skip lock-range check on equal size to avoid size==0 underflow\n\nWhen size equals the current i_size (including 0), the code used to call\ncheck_lock_range(filp, i_size, size - 1, WRITE), which computes `size - 1`\nand can underflow for size==0. Skip the equal case.",
  "id": "GHSA-7vqw-4gww-392j",
  "modified": "2026-01-13T18:31:04Z",
  "published": "2026-01-13T18:31:03Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-68786"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/52fcbb92e0d3acfd1448b2a43b6595d540da5295"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/571204e4758a528fbd67330bd4b0dfbdafb33dd8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5d510ac31626ed157d2182149559430350cf2104"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a6f4cfa3783804336491e0edcb250c25f9b59d33"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/da29cd197246c85c0473259f1cad897d9d28faea"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2025-68786 (GCVE-0-2025-68786)

Vulnerability from cvelistv5 – Published: 2026-01-13 15:28 – Updated: 2026-01-14 08:51

Title

ksmbd: skip lock-range check on equal size to avoid size==0 underflow

Summary

In the Linux kernel, the following vulnerability has been resolved: ksmbd: skip lock-range check on equal size to avoid size==0 underflow When size equals the current i_size (including 0), the code used to call check_lock_range(filp, i_size, size - 1, WRITE), which computes `size - 1` and can underflow for size==0. Skip the equal case.

Severity ?

No CVSS data available.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/52fcbb92e0d3acfd1…
	https://git.kernel.org/stable/c/da29cd197246c85c0…
	https://git.kernel.org/stable/c/a6f4cfa3783804336…
	https://git.kernel.org/stable/c/571204e4758a528fb…
	https://git.kernel.org/stable/c/5d510ac31626ed157…

Impacted products

Vendor

Product

Version

Linux

Affected: f44158485826c076335d6860d35872271a83791d , < 52fcbb92e0d3acfd1448b2a43b6595d540da5295 (git)
Affected: f44158485826c076335d6860d35872271a83791d , < da29cd197246c85c0473259f1cad897d9d28faea (git)
Affected: f44158485826c076335d6860d35872271a83791d , < a6f4cfa3783804336491e0edcb250c25f9b59d33 (git)
Affected: f44158485826c076335d6860d35872271a83791d , < 571204e4758a528fbd67330bd4b0dfbdafb33dd8 (git)
Affected: f44158485826c076335d6860d35872271a83791d , < 5d510ac31626ed157d2182149559430350cf2104 (git)

Linux

Affected: 5.15
Unaffected: 0 , < 5.15 (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-rc1 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/smb/server/vfs.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "52fcbb92e0d3acfd1448b2a43b6595d540da5295",
              "status": "affected",
              "version": "f44158485826c076335d6860d35872271a83791d",
              "versionType": "git"
            },
            {
              "lessThan": "da29cd197246c85c0473259f1cad897d9d28faea",
              "status": "affected",
              "version": "f44158485826c076335d6860d35872271a83791d",
              "versionType": "git"
            },
            {
              "lessThan": "a6f4cfa3783804336491e0edcb250c25f9b59d33",
              "status": "affected",
              "version": "f44158485826c076335d6860d35872271a83791d",
              "versionType": "git"
            },
            {
              "lessThan": "571204e4758a528fbd67330bd4b0dfbdafb33dd8",
              "status": "affected",
              "version": "f44158485826c076335d6860d35872271a83791d",
              "versionType": "git"
            },
            {
              "lessThan": "5d510ac31626ed157d2182149559430350cf2104",
              "status": "affected",
              "version": "f44158485826c076335d6860d35872271a83791d",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/smb/server/vfs.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": "6.1.*",
              "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-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.160",
                  "versionStartIncluding": "5.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.120",
                  "versionStartIncluding": "5.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.64",
                  "versionStartIncluding": "5.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                },
                {
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                  "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: skip lock-range check on equal size to avoid size==0 underflow\n\nWhen size equals the current i_size (including 0), the code used to call\ncheck_lock_range(filp, i_size, size - 1, WRITE), which computes `size - 1`\nand can underflow for size==0. Skip the equal case."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-01-14T08:51:31.484Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/52fcbb92e0d3acfd1448b2a43b6595d540da5295"
        },
        {
          "url": "https://git.kernel.org/stable/c/da29cd197246c85c0473259f1cad897d9d28faea"
        },
        {
          "url": "https://git.kernel.org/stable/c/a6f4cfa3783804336491e0edcb250c25f9b59d33"
        },
        {
          "url": "https://git.kernel.org/stable/c/571204e4758a528fbd67330bd4b0dfbdafb33dd8"
        },
        {
          "url": "https://git.kernel.org/stable/c/5d510ac31626ed157d2182149559430350cf2104"
        }
      ],
      "title": "ksmbd: skip lock-range check on equal size to avoid size==0 underflow",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-68786",
    "datePublished": "2026-01-13T15:28:59.578Z",
    "dateReserved": "2025-12-24T10:30:51.036Z",
    "dateUpdated": "2026-01-14T08:51:31.484Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date

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.

Detection rules are retrieved from Rulezet.

Action not permitted

GHSA-7VQW-4GWW-392J

CVE-2025-68786 (GCVE-0-2025-68786)

Tags

Sightings

Nomenclature