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CVE-2026-31478 (GCVE-0-2026-31478)

Vulnerability from cvelistv5 – Published: 2026-04-22 13:54 – Updated: 2026-08-05 12:22
VLAI
Title
ksmbd: replace hardcoded hdr2_len with offsetof() in smb2_calc_max_out_buf_len()
Summary
In the Linux kernel, the following vulnerability has been resolved: ksmbd: replace hardcoded hdr2_len with offsetof() in smb2_calc_max_out_buf_len() After this commit (e2b76ab8b5c9 "ksmbd: add support for read compound"), response buffer management was changed to use dynamic iov array. In the new design, smb2_calc_max_out_buf_len() expects the second argument (hdr2_len) to be the offset of ->Buffer field in the response structure, not a hardcoded magic number. Fix the remaining call sites to use the correct offsetof() value.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: f2283680a80571ca82d710bc6ecd8f8beac67d63 , < 70b4c414889492c522b6e4331562360f49be2361 (git)
Affected: 9f297df20d93411c0b4ddad7f88ba04a7cd36e77 , < 9a7166f0ef8cbb7bb48dd05e2471d995566003f5 (git)
Affected: e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d , < c3a89e3ec1ccf64fa6a34e391e1581ebbcba8683 (git)
Affected: e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d , < 6aef1765d6807e0f027cd87f6ac973eb0879a46d (git)
Affected: e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d , < 80824c7e527b70cf9039534e60aff592e8f209d1 (git)
Affected: e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d , < 4cb537ae4f37d7d0f617815ed4bed7173fb50861 (git)
Affected: e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d , < 0e55f63dd08f09651d39e1b709a91705a8a0ddcb (git)
Affected: 5.15.145 , < 5.15.203 (semver)
Affected: 6.1.71 , < 6.1.168 (semver)
guessed Create a notification for this product.
Linux Linux Affected: 6.6
Unaffected: 0 , < 6.6 (semver)
Unaffected: 5.15.203 , ≤ 5.15.* (semver)
Unaffected: 6.1.168 , ≤ 6.1.* (semver)
Unaffected: 6.6.131 , ≤ 6.6.* (semver)
Unaffected: 6.12.80 , ≤ 6.12.* (semver)
Unaffected: 6.18.21 , ≤ 6.18.* (semver)
Unaffected: 6.19.11 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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    "nvd": "{\"cve\":{\"id\":\"CVE-2026-31478\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-04-22T14:16:44.630\",\"lastModified\":\"2026-06-17T10:33:49.137\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nksmbd: replace hardcoded hdr2_len with offsetof() in smb2_calc_max_out_buf_len()\\n\\nAfter this commit (e2b76ab8b5c9 \\\"ksmbd: add support for read compound\\\"),\\nresponse buffer management was changed to use dynamic iov array.\\nIn the new design, smb2_calc_max_out_buf_len() expects the second\\nargument (hdr2_len) to be the offset of -\u003eBuffer field in the\\nresponse structure, not a hardcoded magic number.\\nFix the remaining call sites to use the correct offsetof() 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    "redhat_vex": {
      "aggregate_severity": "None",
      "current_release_date": "2026-06-28T07:25:39+00:00",
      "cve": "CVE-2026-31478",
      "id": "CVE-2026-31478",
      "initial_release_date": "2026-04-22T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ksmbd: replace hardcoded hdr2_len with offsetof() in smb2_calc_max_out_buf_len()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-31478.json",
      "version": "3"
    }
  }
}



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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

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.