FKIE_CVE-2025-68786

Vulnerability from fkie_nvd - Published: 2026-01-13 16:15 - Updated: 2026-06-17 09:59
Severity
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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/52fcbb92e0d3acfd1448b2a43b6595d540da5295
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/571204e4758a528fbd67330bd4b0dfbdafb33dd8
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5d510ac31626ed157d2182149559430350cf2104
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a6f4cfa3783804336491e0edcb250c25f9b59d33
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/da29cd197246c85c0473259f1cad897d9d28faea
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "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",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "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."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nksmbd: omitir la comprobaci\u00f3n del rango de bloqueo en tama\u00f1o igual para evitar el desbordamiento negativo cuando size==0\n\nCuando size es igual al i_size actual (incluyendo 0), el c\u00f3digo sol\u00eda llamar a check_lock_range(filp, i_size, size - 1, WRITE), que calcula size - 1 y puede sufrir un desbordamiento negativo cuando size==0. Omitir el caso de igualdad."
    }
  ],
  "id": "CVE-2025-68786",
  "lastModified": "2026-06-17T09:59:35.243",
  "metrics": {},
  "published": "2026-01-13T16:15:58.357",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/52fcbb92e0d3acfd1448b2a43b6595d540da5295"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/571204e4758a528fbd67330bd4b0dfbdafb33dd8"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/5d510ac31626ed157d2182149559430350cf2104"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/a6f4cfa3783804336491e0edcb250c25f9b59d33"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/da29cd197246c85c0473259f1cad897d9d28faea"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Deferred"
}


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