FKIE_CVE-2025-68786

Vulnerability from fkie_nvd - Published: 2026-01-13 16:15 - Updated: 2026-04-15 00:35
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 

{
  "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": "2026-04-15T00:35:42.020",
  "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"
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.


Detection rules are retrieved from Rulezet.