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w1: ds28e17: reject an oversize length on an I2C block read

Type: advisorySources: OSV

In the Linux kernel, the following vulnerability has been resolved: w1: ds28e17: reject an oversize length on an I2C block read w1_f19_i2c_master_transfer() is the master_xfer for the DS28E17 1-Wire to I2C bridge. On an I2C_M_RECV_LEN read, it takes the length from the device. The downstream slave puts a length byte in buf[0]. The driver then reads that many bytes into buf[1] with w1_f19_i2c_read(). buf[0] is controlled by the device and can be 0 to 255. w1_f19_i2c_read() only rejects a zero count. The caller buffer is I2C_SMBUS_BLOCK_MAX + 2, so 34 bytes. A length above 32 makes the read run past it, up to about 222 bytes out of bounds. The SMBus core does check buf[0] against I2C_SMBUS_BLOCK_MAX. That check runs after master_xfer returns. By then the write is already done. i2c-algo-bit rejects an oversize length before it copies, and returns -EPROTO. Reject a length above I2C_SMBUS_BLOCK_MAX at both RECV_LEN sites, the same way i2c-algo-bit does.

Products
Kernel
Affected versions
Not specified
Fixed versions
5.10.270, 5.15.221, 6.1.188, 6.12.109, 6.18.50, 6.6.157, 7.2.4
CVEs
CVE-2026-80931
Confirmed fixed CVEs
Not specified
Updated in this feed
3 Nov 2026, 06:48 UTC · Revision 1

Source evidence

w1: ds28e17: reject an oversize length on an I2C block read

core-osv · Original source

Published 11 Sept 2026, 19:42 UTC

In the Linux kernel, the following vulnerability has been resolved: w1: ds28e17: reject an oversize length on an I2C block read w1_f19_i2c_master_transfer() is the master_xfer for the DS28E17 1-Wire to I2C bridge. On an I2C_M_RECV_LEN read, it takes the length from the device. The downstream slave puts a length byte in buf[0]. The driver then reads that many bytes into buf[1] with w1_f19_i2c_read(). buf[0] is controlled by the device and can be 0 to 255. w1_f19_i2c_read() only rejects a zero count. The caller buffer is I2C_SMBUS_BLOCK_MAX + 2, so 34 bytes. A length above 32 makes the read run past it, up to about 222 bytes out of bounds. The SMBus core does check buf[0] against I2C_SMBUS_BLOCK_MAX. That check runs after master_xfer returns. By then the write is already done. i2c-algo-bit rejects an oversize length before it copies, and returns -EPROTO. Reject a length above I2C_SMBUS_BLOCK_MAX at both RECV_LEN sites, the same way i2c-algo-bit does.

osv:CVE-2026-80931

Kernel

Fixed versions: 5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.109, 6.18.50, 7.2.4

Complete source record
{
  "id": "4dacaa57f3c4cc2ee35387c23c622145bc4db2b83016fb214a9afdeb8023cb61",
  "url": "https://osv.dev/vulnerability/CVE-2026-80931",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "w1: ds28e17: reject an oversize length on an I2C block read",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: w1: ds28e17: reject an oversize length on an I2C block read w1_f19_i2c_master_transfer() is the master_xfer for the DS28E17 1-Wire to I2C bridge. On an I2C_M_RECV_LEN read, it takes the length from the device. The downstream slave puts a length byte in buf[0]. The driver then reads that many bytes into buf[1] with w1_f19_i2c_read(). buf[0] is controlled by the device and can be 0 to 255. w1_f19_i2c_read() only rejects a zero count. The caller buffer is I2C_SMBUS_BLOCK_MAX + 2, so 34 bytes. A length above 32 makes the read run past it, up to about 222 bytes out of bounds. The SMBus core does check buf[0] against I2C_SMBUS_BLOCK_MAX. That check runs after master_xfer returns. By then the write is already done. i2c-algo-bit rejects an oversize length before it copies, and returns -EPROTO. Reject a length above I2C_SMBUS_BLOCK_MAX at both RECV_LEN sites, the same way i2c-algo-bit does.",
    "evidence": "osv:CVE-2026-80931",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.10.270",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.15.221",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.1.188",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.6.157",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.109",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.50",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.2.4",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-80931",
      "aliases": [
        "CVE-2026-80931"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
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              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
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                },
                {
                  "fixed": "1d08877fc37e90945df38d255715bd1d6c052d46"
                },
                {
                  "fixed": "bf76d61e118b7044600a65775a3bf8adc2c6823d"
                },
                {
                  "fixed": "0f6496b34cc2919420f303b2aabdd9f71e084b56"
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                {
                  "fixed": "cb55c5da9828f77db2a2701316949d4de1e9b773"
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                {
                  "fixed": "ae0c79a8527044e54d81fd5a3b49ce6177633758"
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                {
                  "fixed": "6df05f630c84a109736642362e452089886f9974"
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                {
                  "fixed": "169ae5e65e5aaf213b6a578f6478a9fd2e523606"
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              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-80931.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "4.15.0"
                },
                {
                  "fixed": "5.10.270"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.11.0"
                },
                {
                  "fixed": "5.15.221"
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              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.16.0"
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                  "fixed": "6.1.188"
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            {
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            {
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              "events": [
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                  "introduced": "6.7.0"
                },
                {
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              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.18.50"
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              ]
            },
            {
              "type": "ECOSYSTEM",
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                  "introduced": "6.19.0"
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          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-80931.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:26.554074119Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/0f6496b34cc2919420f303b2aabdd9f71e084b56",
        "https://git.kernel.org/stable/c/169ae5e65e5aaf213b6a578f6478a9fd2e523606",
        "https://git.kernel.org/stable/c/1d08877fc37e90945df38d255715bd1d6c052d46",
        "https://git.kernel.org/stable/c/6df05f630c84a109736642362e452089886f9974",
        "https://git.kernel.org/stable/c/ae0c79a8527044e54d81fd5a3b49ce6177633758",
        "https://git.kernel.org/stable/c/b30c021c6073559ea6851b522d8a17a524a27b4a",
        "https://git.kernel.org/stable/c/bf76d61e118b7044600a65775a3bf8adc2c6823d",
        "https://git.kernel.org/stable/c/cb55c5da9828f77db2a2701316949d4de1e9b773",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80931.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-80931",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80931.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-80931",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 493129,
  "published_at": "2026-09-11T19:42:06.272+00:00"
}