CVE-2026-89794 (GCVE-0-2026-89794)
Vulnerability from cvelistv5
Published
2026-09-16 10:30
Modified
2026-10-30 12:33
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: ksmbd: zero pipe read compound padding Compound response handling extends the last response iov to an eight-byte boundary. smb2_read_pipe() allocates only the payload size, so the alignment padding can expose up to seven bytes of uninitialized kernel heap memory. Allocate the aligned size and clear the unused tail before pinning the response buffer.
References
Impacted products
Vendor Product Version
Linux Linux Version: 9f297df20d93411c0b4ddad7f88ba04a7cd36e77
Version: e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d
Version: e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d
Version: e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d
Version: e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d
Version: e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d
Version: f2283680a80571ca82d710bc6ecd8f8beac67d63
Version: 6.1.71   ≤
Version: 5.15.145   ≤
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{
  "containers": {
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      "affected": [
        {
          "defaultStatus": "unaffected",
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          "programFiles": [
            "fs/smb/server/smb2pdu.c"
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          "vendor": "Linux",
          "versions": [
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            },
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              "version": "0",
              "versionType": "semver"
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              "versionType": "semver"
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              "versionType": "semver"
            },
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              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
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            },
            {
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              "status": "unaffected",
              "version": "7.2.5",
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            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "vulnerable": true
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        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: zero pipe read compound padding\n\nCompound response handling extends the last response iov to an eight-byte\nboundary.\n\nsmb2_read_pipe() allocates only the payload size, so the alignment padding\ncan expose up to seven bytes of uninitialized kernel heap memory.\n\nAllocate the aligned size and clear the unused tail before pinning the\nresponse buffer."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-30T12:33:02.393Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/c7516bdf7d2c1a64b14a9f444e2ee58c12c384ae"
        },
        {
          "url": "https://git.kernel.org/stable/c/134d980491b435e5cdb3171225e2506ff17867d1"
        },
        {
          "url": "https://git.kernel.org/stable/c/f188a400dd5285fec5a84548fe8dca49eee01155"
        },
        {
          "url": "https://git.kernel.org/stable/c/d83a9de7cecd401c3d3e00ed6371194dcd7313e4"
        },
        {
          "url": "https://git.kernel.org/stable/c/be15b8da4a82cf1e1f9880b2661b90770606eec1"
        },
        {
          "url": "https://git.kernel.org/stable/c/73f860489e3be2245598d1819226304fc5b87291"
        }
      ],
      "title": "ksmbd: zero pipe read compound padding",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89794",
    "datePublished": "2026-09-16T10:30:25.592Z",
    "dateReserved": "2026-09-11T19:38:34.766Z",
    "dateUpdated": "2026-10-30T12:33:02.393Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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