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ksmbd: replace hardcoded hdr2_len with offsetof() in smb2_calc_max_out_buf_len()

Type: advisorySource: Official CVE List1 source record

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.

Announced Source revision 1
Original source ↗

CVE-2026-31478

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-31478

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "f2283680a80571ca82d710bc6ecd8f8beac67d63",
        "lessThan": "70b4c414889492c522b6e4331562360f49be2361",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "9f297df20d93411c0b4ddad7f88ba04a7cd36e77",
        "lessThan": "9a7166f0ef8cbb7bb48dd05e2471d995566003f5",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d",
        "lessThan": "c3a89e3ec1ccf64fa6a34e391e1581ebbcba8683",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d",
        "lessThan": "6aef1765d6807e0f027cd87f6ac973eb0879a46d",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d",
        "lessThan": "80824c7e527b70cf9039534e60aff592e8f209d1",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d",
        "lessThan": "4cb537ae4f37d7d0f617815ed4bed7173fb50861",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d",
        "lessThan": "0e55f63dd08f09651d39e1b709a91705a8a0ddcb",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "5.15.145",
        "lessThan": "5.15.203",
        "versionType": "semver"
      },
      {
        "status": "affected",
        "version": "6.1.71",
        "lessThan": "6.1.168",
        "versionType": "semver"
      }
    ],
    "programFiles": [
      "fs/smb/server/smb2pdu.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "6.6"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "6.6",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.15.203",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.168",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.131",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.80",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.21",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "6.19.11",
        "versionType": "semver",
        "lessThanOrEqual": "6.19.*"
      },
      {
        "status": "unaffected",
        "version": "7.0",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "fs/smb/server/smb2pdu.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-31478

Source reference: /cveMetadata/cveId

Publisher severity

critical

Source reference: /containers/cna/metrics

Event
#39905 · Revision 1
Added to Heist Feed
Publisher date
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