CVE-2026-64135 (GCVE-0-2026-64135)

Vulnerability from cvelistv5 – Published: 2026-07-19 15:40 – Updated: 2026-07-19 15:40
VLAI
Title
hwmon: (pmbus/adm1266) widen blackbox-info buffer to I2C_SMBUS_BLOCK_MAX
Summary
In the Linux kernel, the following vulnerability has been resolved: hwmon: (pmbus/adm1266) widen blackbox-info buffer to I2C_SMBUS_BLOCK_MAX adm1266_nvmem_read_blackbox() declares a 5-byte stack buffer and passes it to i2c_smbus_read_block_data() to retrieve the 4-byte BLACKBOX_INFO response. i2c_smbus_read_block_data() does not honour caller buffer sizes -- it memcpy()s data.block[0] bytes from the SMBus transaction (where data.block[0] is the length byte returned by the slave device, up to I2C_SMBUS_BLOCK_MAX = 32): memcpy(values, &data.block[1], data.block[0]); If the device returns any block length above 5, the call overflows the caller's 5-byte stack buffer before the post-call if (ret != 4) return -EIO; check has a chance to reject the response. Widen the local buffer to I2C_SMBUS_BLOCK_MAX so the helper has room for any well-formed SMBus block response, matching the convention used by the other i2c_smbus_read_block_data() callers in this driver.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 15609d1893020436e1e8ccfd9ded774a96dd17a2 , < 33251abb9c9dd62943be76f0427c5527ee39188f (git)
Affected: 15609d1893020436e1e8ccfd9ded774a96dd17a2 , < ba09f4baa5bd96c5d26c942defa546a72dbbe5bf (git)
Affected: 15609d1893020436e1e8ccfd9ded774a96dd17a2 , < 6ed16a40b162e9d87d9ac8bed4d7f0e3e807700e (git)
Affected: 15609d1893020436e1e8ccfd9ded774a96dd17a2 , < 0dbf64c502443c08c2e28a77ecbfcc5479d93228 (git)
Affected: 15609d1893020436e1e8ccfd9ded774a96dd17a2 , < 2b7a698d5093b548c464828d984f05ced5f3fd2a (git)
Affected: 15609d1893020436e1e8ccfd9ded774a96dd17a2 , < ca560f7566df7e2826c2999e959e6b94eb938f76 (git)
Affected: 15609d1893020436e1e8ccfd9ded774a96dd17a2 , < 7f705e581ef3e6bb308a121a89adf5237d968204 (git)
Affected: 15609d1893020436e1e8ccfd9ded774a96dd17a2 , < eee213daa1e1b402eb631bcd1b8c5aa340a6b081 (git)
Create a notification for this product.
Linux Linux Affected: 5.10
Unaffected: 0 , < 5.10 (semver)
Unaffected: 5.10.258 , ≤ 5.10.* (semver)
Unaffected: 5.15.209 , ≤ 5.15.* (semver)
Unaffected: 6.1.175 , ≤ 6.1.* (semver)
Unaffected: 6.6.142 , ≤ 6.6.* (semver)
Unaffected: 6.12.92 , ≤ 6.12.* (semver)
Unaffected: 6.18.34 , ≤ 6.18.* (semver)
Unaffected: 7.0.11 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nhwmon: (pmbus/adm1266) widen blackbox-info buffer to I2C_SMBUS_BLOCK_MAX\n\nadm1266_nvmem_read_blackbox() declares a 5-byte stack buffer and\npasses it to i2c_smbus_read_block_data() to retrieve the 4-byte\nBLACKBOX_INFO response.  i2c_smbus_read_block_data() does not honour\ncaller buffer sizes -- it memcpy()s data.block[0] bytes from the\nSMBus transaction (where data.block[0] is the length byte returned by\nthe slave device, up to I2C_SMBUS_BLOCK_MAX = 32):\n\n\tmemcpy(values, \u0026data.block[1], data.block[0]);\n\nIf the device returns any block length above 5, the call overflows\nthe caller\u0027s 5-byte stack buffer before the post-call\n\n\tif (ret != 4)\n\t\treturn -EIO;\n\ncheck has a chance to reject the response.\n\nWiden the local buffer to I2C_SMBUS_BLOCK_MAX so the helper has room\nfor any well-formed SMBus block response, matching the convention used\nby the other i2c_smbus_read_block_data() callers in this driver."
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      "providerMetadata": {
        "dateUpdated": "2026-07-19T15:40:29.676Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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      ],
      "title": "hwmon: (pmbus/adm1266) widen blackbox-info buffer to I2C_SMBUS_BLOCK_MAX",
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    "dateReserved": "2026-07-19T07:54:57.036Z",
    "dateUpdated": "2026-07-19T15:40:29.676Z",
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buffer before the post-call\\n\\n\\tif (ret != 4)\\n\\t\\treturn -EIO;\\n\\ncheck has a chance to reject the response.\\n\\nWiden the local buffer to I2C_SMBUS_BLOCK_MAX so the helper has room\\nfor any well-formed SMBus block response, matching the convention used\\nby the other i2c_smbus_read_block_data() callers in this 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    "redhat_vex": {
      "aggregate_severity": "None",
      "current_release_date": "2026-07-21T05:15:42+00:00",
      "cve": "CVE-2026-64135",
      "id": "CVE-2026-64135",
      "initial_release_date": "2026-07-19T00:00:00+00:00",
      "product_status:known_not_affected": "275",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: hwmon: (pmbus/adm1266) widen blackbox-info buffer to I2C_SMBUS_BLOCK_MAX",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64135.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "not set",
      "current_release_date": "2026-07-21T12:59:03Z",
      "cve": "CVE-2026-64135",
      "id": "CVE-2026-64135",
      "initial_release_date": "2026-07-21T12:59:03Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-64135",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-64135.json",
      "version": "2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.