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

Type: advisorySource: Official CVE List1 source record

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.

Announced Source revision 1
Original source ↗

CVE-2026-80931

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-2026-80931

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": "ebc4768ac4971eab4b570e733e47ac9dfd0e4175",
        "lessThan": "b30c021c6073559ea6851b522d8a17a524a27b4a",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ebc4768ac4971eab4b570e733e47ac9dfd0e4175",
        "lessThan": "1d08877fc37e90945df38d255715bd1d6c052d46",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ebc4768ac4971eab4b570e733e47ac9dfd0e4175",
        "lessThan": "bf76d61e118b7044600a65775a3bf8adc2c6823d",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ebc4768ac4971eab4b570e733e47ac9dfd0e4175",
        "lessThan": "0f6496b34cc2919420f303b2aabdd9f71e084b56",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ebc4768ac4971eab4b570e733e47ac9dfd0e4175",
        "lessThan": "cb55c5da9828f77db2a2701316949d4de1e9b773",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ebc4768ac4971eab4b570e733e47ac9dfd0e4175",
        "lessThan": "ae0c79a8527044e54d81fd5a3b49ce6177633758",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ebc4768ac4971eab4b570e733e47ac9dfd0e4175",
        "lessThan": "6df05f630c84a109736642362e452089886f9974",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ebc4768ac4971eab4b570e733e47ac9dfd0e4175",
        "lessThan": "169ae5e65e5aaf213b6a578f6478a9fd2e523606",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "drivers/w1/slaves/w1_ds28e17.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "4.15"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "4.15",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.270",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.221",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.188",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.157",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.109",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.50",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.4",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/w1/slaves/w1_ds28e17.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-80931

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#34892 · Revision 1
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Publisher date
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