Vulnerability-Lookup

GHSA-HJCF-H98X-X745

Vulnerability from github – Published: 2026-04-22 15:31 – Updated: 2026-04-22 15:31

Details

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.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-31478"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-04-22T14:16:44Z",
    "severity": null
  },
  "details": "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() value.",
  "id": "GHSA-hjcf-h98x-x745",
  "modified": "2026-04-22T15:31:42Z",
  "published": "2026-04-22T15:31:42Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-31478"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0e55f63dd08f09651d39e1b709a91705a8a0ddcb"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4cb537ae4f37d7d0f617815ed4bed7173fb50861"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6aef1765d6807e0f027cd87f6ac973eb0879a46d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/70b4c414889492c522b6e4331562360f49be2361"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/80824c7e527b70cf9039534e60aff592e8f209d1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9a7166f0ef8cbb7bb48dd05e2471d995566003f5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c3a89e3ec1ccf64fa6a34e391e1581ebbcba8683"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

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

Vulnerability from cvelistv5 – Published: 2026-04-22 13:54 – Updated: 2026-04-22 13:54

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 ?

No CVSS data available.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/70b4c414889492c52…
	https://git.kernel.org/stable/c/9a7166f0ef8cbb7bb…
	https://git.kernel.org/stable/c/c3a89e3ec1ccf64fa…
	https://git.kernel.org/stable/c/6aef1765d6807e0f0…
	https://git.kernel.org/stable/c/80824c7e527b70cf9…
	https://git.kernel.org/stable/c/4cb537ae4f37d7d0f…
	https://git.kernel.org/stable/c/0e55f63dd08f09651…

Impacted products

Vendor

Product

Version

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)

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)

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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/smb/server/smb2pdu.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.6"
            },
            {
              "lessThan": "6.6",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "5.15.203",
              "versionType": "semver"
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            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.168",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.131",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.80",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.21",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.11",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.203",
                  "versionStartIncluding": "5.15.145",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "vulnerable": true
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              "operator": "OR"
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          "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() value."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-04-22T13:54:06.157Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        {
          "url": "https://git.kernel.org/stable/c/0e55f63dd08f09651d39e1b709a91705a8a0ddcb"
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      ],
      "title": "ksmbd: replace hardcoded hdr2_len with offsetof() in smb2_calc_max_out_buf_len()",
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  "cveMetadata": {
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    "cveId": "CVE-2026-31478",
    "datePublished": "2026-04-22T13:54:06.157Z",
    "dateReserved": "2026-03-09T15:48:24.098Z",
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    "state": "PUBLISHED"
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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.

Action not permitted

GHSA-HJCF-H98X-X745

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

Tags

Sightings

Nomenclature