CVE-2026-98204 (GCVE-0-2026-98204)
Vulnerability from cvelistv5
Published
2026-10-06 08:44
Modified
2026-10-19 09:15
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: Input: rmi_smbus - fix out-of-bounds read in rmi_smb_write_block() When chunking writes into SMBus blocks in rmi_smb_write_block(), the loop calculates block_len using the original total length (len) instead of the remaining length (cur_len). If len is greater than 32 bytes (SMB_MAX_COUNT), block_len remains 32 for every iteration, even on the final partial chunk where fewer than 32 bytes remain. This causes smb_block_write() to read 32 bytes from the advanced data buffer pointer, reading past the end of the input buffer. Fix this by calculating block_len using cur_len and advancing the buffer and address pointers by block_len.
References
Impacted products
Vendor Product Version
Linux Linux Version: 82264d0cf7aef2247563c031ff2ab96579d5d0cc
Version: 82264d0cf7aef2247563c031ff2ab96579d5d0cc
Version: 82264d0cf7aef2247563c031ff2ab96579d5d0cc
Version: 82264d0cf7aef2247563c031ff2ab96579d5d0cc
Version: 82264d0cf7aef2247563c031ff2ab96579d5d0cc
Version: 82264d0cf7aef2247563c031ff2ab96579d5d0cc
Version: 82264d0cf7aef2247563c031ff2ab96579d5d0cc
Version: 82264d0cf7aef2247563c031ff2ab96579d5d0cc
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{
  "containers": {
    "cna": {
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          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/input/rmi4/rmi_smbus.c"
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          "vendor": "Linux",
          "versions": [
            {
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              "version": "4.10"
            },
            {
              "lessThan": "4.10",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.271",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.222",
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            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.189",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.6.158",
              "versionType": "semver"
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              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.112",
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              "status": "unaffected",
              "version": "6.18.54",
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              "status": "unaffected",
              "version": "7.2.8",
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            {
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              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
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              ],
              "negate": false,
              "operator": "OR"
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          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nInput: rmi_smbus - fix out-of-bounds read in rmi_smb_write_block()\n\nWhen chunking writes into SMBus blocks in rmi_smb_write_block(), the\nloop calculates block_len using the original total length (len) instead\nof the remaining length (cur_len).\n\nIf len is greater than 32 bytes (SMB_MAX_COUNT), block_len remains 32\nfor every iteration, even on the final partial chunk where fewer than 32\nbytes remain. This causes smb_block_write() to read 32 bytes from the\nadvanced data buffer pointer, reading past the end of the input buffer.\n\nFix this by calculating block_len using cur_len and advancing the buffer\nand address pointers by block_len."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:15:35.168Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/d01337c0892d1509500c727edf81380777c2dd0f"
        },
        {
          "url": "https://git.kernel.org/stable/c/7c800af1c6030a5f27d46ce7d6d5d75f9c1efaf8"
        },
        {
          "url": "https://git.kernel.org/stable/c/29fbcf5834f0a7f74bfd017c07da2411b35a4e2a"
        },
        {
          "url": "https://git.kernel.org/stable/c/50dd585bee7669eb165e5defcc35d17f3822cfbb"
        },
        {
          "url": "https://git.kernel.org/stable/c/e022538e13dd1c82af5ec25ac28f12ca0ab26160"
        },
        {
          "url": "https://git.kernel.org/stable/c/dc05ec97b8299e48e31367a9bc412c7e9c0e2b42"
        },
        {
          "url": "https://git.kernel.org/stable/c/9f0ce5e162eed8b68345abe839c59768bc60f99a"
        },
        {
          "url": "https://git.kernel.org/stable/c/51cfe54f815ae175c7d1126b983d4d7c89715004"
        }
      ],
      "title": "Input: rmi_smbus - fix out-of-bounds read in rmi_smb_write_block()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98204",
    "datePublished": "2026-10-06T08:44:41.712Z",
    "dateReserved": "2026-09-25T10:25:14.325Z",
    "dateUpdated": "2026-10-19T09:15:35.168Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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