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

Vulnerability from cvelistv5 – Published: 2026-01-13 15:28 – Updated: 2026-05-11 21:53
VLAI
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
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: f44158485826c076335d6860d35872271a83791d , < 52fcbb92e0d3acfd1448b2a43b6595d540da5295 (git)
Affected: f44158485826c076335d6860d35872271a83791d , < da29cd197246c85c0473259f1cad897d9d28faea (git)
Affected: f44158485826c076335d6860d35872271a83791d , < a6f4cfa3783804336491e0edcb250c25f9b59d33 (git)
Affected: f44158485826c076335d6860d35872271a83791d , < 571204e4758a528fbd67330bd4b0dfbdafb33dd8 (git)
Affected: f44158485826c076335d6860d35872271a83791d , < 5d510ac31626ed157d2182149559430350cf2104 (git)
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Linux 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 , ≤ * (original_commit_for_fix)
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{
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          "programFiles": [
            "fs/smb/server/vfs.c"
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              "negate": false,
              "operator": "OR"
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      ],
      "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."
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        "shortName": "Linux"
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-68786",
    "datePublished": "2026-01-13T15:28:59.578Z",
    "dateReserved": "2025-12-24T10:30:51.036Z",
    "dateUpdated": "2026-05-11T21:53:19.839Z",
    "state": "PUBLISHED"
  },
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      "date": "2026-09-15",
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      "percentile": "0.09673"
    },
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      "product_status:known_affected": "1",
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      "title": "ksmbd: skip lock-range check on equal size to avoid size==0 underflow",
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      "version": "4"
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}



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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

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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.


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Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.