CVE-2026-98204

Full vulnerability record from the local CVENow database.

Description

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.

Severity

Not scored

CVSS score

Not available

Vulnerability status

Received

Source identifier

416baaa9-dc9f-4396-8d5f-8c081fb06d67

Published

2026-10-06 09:18:06.383000

Last modified

2026-10-19 10:18:21.060000

View original CVE JSON

{
  "id": "CVE-2026-98204",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2026-10-06T09:18:06.383",
  "lastModified": "2026-10-19T10:18:21.060",
  "vulnStatus": "Received",
  "cveTags": [],
  "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."
    }
  ],
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "programFiles": [
            "drivers/input/rmi4/rmi_smbus.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "82264d0cf7aef2247563c031ff2ab96579d5d0cc",
              "lessThan": "d01337c0892d1509500c727edf81380777c2dd0f",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "82264d0cf7aef2247563c031ff2ab96579d5d0cc",
              "lessThan": "7c800af1c6030a5f27d46ce7d6d5d75f9c1efaf8",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "82264d0cf7aef2247563c031ff2ab96579d5d0cc",
              "lessThan": "29fbcf5834f0a7f74bfd017c07da2411b35a4e2a",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "82264d0cf7aef2247563c031ff2ab96579d5d0cc",
              "lessThan": "50dd585bee7669eb165e5defcc35d17f3822cfbb",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "82264d0cf7aef2247563c031ff2ab96579d5d0cc",
              "lessThan": "e022538e13dd1c82af5ec25ac28f12ca0ab26160",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "82264d0cf7aef2247563c031ff2ab96579d5d0cc",
              "lessThan": "dc05ec97b8299e48e31367a9bc412c7e9c0e2b42",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "82264d0cf7aef2247563c031ff2ab96579d5d0cc",
              "lessThan": "9f0ce5e162eed8b68345abe839c59768bc60f99a",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "82264d0cf7aef2247563c031ff2ab96579d5d0cc",
              "lessThan": "51cfe54f815ae175c7d1126b983d4d7c89715004",
              "versionType": "git",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "programFiles": [
            "drivers/input/rmi4/rmi_smbus.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "4.10",
              "status": "affected"
            },
            {
              "version": "0",
              "lessThan": "4.10",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "5.10.271",
              "lessThanOrEqual": "5.10.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "5.15.222",
              "lessThanOrEqual": "5.15.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.1.189",
              "lessThanOrEqual": "6.1.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.6.158",
              "lessThanOrEqual": "6.6.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.12.112",
              "lessThanOrEqual": "6.12.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.18.54",
              "lessThanOrEqual": "6.18.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.2.8",
              "lessThanOrEqual": "7.2.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.3",
              "lessThanOrEqual": "*",
              "versionType": "original_commit_for_fix",
              "status": "unaffected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {},
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/29fbcf5834f0a7f74bfd017c07da2411b35a4e2a",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/50dd585bee7669eb165e5defcc35d17f3822cfbb",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/51cfe54f815ae175c7d1126b983d4d7c89715004",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/7c800af1c6030a5f27d46ce7d6d5d75f9c1efaf8",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/9f0ce5e162eed8b68345abe839c59768bc60f99a",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/d01337c0892d1509500c727edf81380777c2dd0f",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/dc05ec97b8299e48e31367a9bc412c7e9c0e2b42",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/e022538e13dd1c82af5ec25ac28f12ca0ab26160",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ]
}