CVE-2025-40084 (GCVE-0-2025-40084)

Vulnerability from cvelistv5 – Published: 2025-10-29 13:37 – Updated: 2025-12-01 06:17
VLAI?
Summary
In the Linux kernel, the following vulnerability has been resolved: ksmbd: transport_ipc: validate payload size before reading handle handle_response() dereferences the payload as a 4-byte handle without verifying that the declared payload size is at least 4 bytes. A malformed or truncated message from ksmbd.mountd can lead to a 4-byte read past the declared payload size. Validate the size before dereferencing. This is a minimal fix to guard the initial handle read.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 0626e6641f6b467447c81dd7678a69c66f7746cf , < a02e432d5130da4c723aabe1205bac805889fdb2 (git)
Affected: 0626e6641f6b467447c81dd7678a69c66f7746cf , < 2dc125f5da134c0915a840b62565c60a595673dd (git)
Affected: 0626e6641f6b467447c81dd7678a69c66f7746cf , < 898d527ed94c19980a4d848f10057f1fed578ffb (git)
Affected: 0626e6641f6b467447c81dd7678a69c66f7746cf , < 867ffd9d67285612da3f0498ca618297f8e41f01 (git)
Affected: 0626e6641f6b467447c81dd7678a69c66f7746cf , < 6f40e50ceb99fc8ef37e5c56e2ec1d162733fef0 (git)
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    Linux Linux Affected: 5.15
Unaffected: 0 , < 5.15 (semver)
Unaffected: 6.1.158 , ≤ 6.1.* (semver)
Unaffected: 6.6.115 , ≤ 6.6.* (semver)
Unaffected: 6.12.56 , ≤ 6.12.* (semver)
Unaffected: 6.17.6 , ≤ 6.17.* (semver)
Unaffected: 6.18 , ≤ * (original_commit_for_fix)
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{
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          "programFiles": [
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      "descriptions": [
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: transport_ipc: validate payload size before reading handle\n\nhandle_response() dereferences the payload as a 4-byte handle without\nverifying that the declared payload size is at least 4 bytes. A malformed\nor truncated message from ksmbd.mountd can lead to a 4-byte read past the\ndeclared payload size. Validate the size before dereferencing.\n\nThis is a minimal fix to guard the initial handle read."
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        "shortName": "Linux"
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      "title": "ksmbd: transport_ipc: validate payload size before reading handle",
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    "cveId": "CVE-2025-40084",
    "datePublished": "2025-10-29T13:37:03.185Z",
    "dateReserved": "2025-04-16T07:20:57.161Z",
    "dateUpdated": "2025-12-01T06:17:41.201Z",
    "state": "PUBLISHED"
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  }
}


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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.