{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "407dc802a9c0809ca6a48de4b4c63305eb84ef56"
            },
            {
              "fixed": "397d3f523bfff2f4e3dacf9b1339bd76dc207f78"
            },
            {
              "fixed": "472744f69d25a2d5111ad62f1d62579dce2c13c8"
            },
            {
              "fixed": "528a9f88e88502d0c2f2052a279415074cd83715"
            },
            {
              "fixed": "d94ceb16e55b6d8019ab069e357c76ac42f0ffbc"
            },
            {
              "fixed": "bd5be3fa5de6dbf61f1b3cec6b79c2c2f8065694"
            },
            {
              "fixed": "2279c342d94eca225bf9f301c8806a05a1c81619"
            },
            {
              "fixed": "a6c802145a8de0830bca803c6d415f7e9e683624"
            },
            {
              "fixed": "487566cb1ccdf3756fdd7bf8d875e612ff3169bb"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.10.0"
            },
            {
              "fixed": "5.10.258"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.209"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.175"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.142"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.92"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.34"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.0.11"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64086.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nhwmon: (pmbus/adm1266) include PEC byte in pmbus_block_xfer read buffer\n\nadm1266_pmbus_block_xfer() sets up the read transaction with\n\n\t.buf = data-\u003eread_buf,\n\t.len = ADM1266_PMBUS_BLOCK_MAX + 2,\n\nbut read_buf in struct adm1266_data is declared as\n\n\tu8 read_buf[ADM1266_PMBUS_BLOCK_MAX + 1];\n\nFor a max-length block response (length byte = 255 + up to 1 PEC\nbyte), the i2c controller is told to write 257 bytes into a 256-byte\nbuffer, putting one byte past the end of read_buf.  The same response\nalso makes the subsequent PEC compare\n\n\tif (crc != msgs[1].buf[msgs[1].buf[0] + 1])\n\nread a byte beyond the array.\n\nBump the read_buf declaration to ADM1266_PMBUS_BLOCK_MAX + 2 so the\nbuffer can hold the length byte, up to 255 payload bytes, and the PEC\nbyte the i2c_msg length already accounts for.",
  "id": "CVE-2026-64086",
  "modified": "2026-07-22T05:29:45.912554466Z",
  "published": "2026-07-19T15:39:56.749Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2279c342d94eca225bf9f301c8806a05a1c81619"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/397d3f523bfff2f4e3dacf9b1339bd76dc207f78"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/472744f69d25a2d5111ad62f1d62579dce2c13c8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/487566cb1ccdf3756fdd7bf8d875e612ff3169bb"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/528a9f88e88502d0c2f2052a279415074cd83715"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a6c802145a8de0830bca803c6d415f7e9e683624"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bd5be3fa5de6dbf61f1b3cec6b79c2c2f8065694"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d94ceb16e55b6d8019ab069e357c76ac42f0ffbc"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64086.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64086"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "hwmon: (pmbus/adm1266) include PEC byte in pmbus_block_xfer read buffer"
}