{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "f5b8abf9fc3dacd7529d363e26fe8230935d65f8"
            },
            {
              "fixed": "93e01e837e105299f1c259ef71f6e1ec4fe806e3"
            },
            {
              "fixed": "11f83253244060b5de5eac787f61ae3f3e559d01"
            },
            {
              "fixed": "fa9861e5c8af7651dddfa8d490aaada17ae33b6c"
            },
            {
              "fixed": "6ff2ebfef75fbc57d937d8fbe738b967edf2d331"
            },
            {
              "fixed": "1eeedb310229bfee9dd4d992e5bba33fe1378a8f"
            },
            {
              "fixed": "2a14e91b6d76639dac70ea170f4384c1ee3cb48d"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.18.0"
            },
            {
              "fixed": "6.1.165"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.128"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.75"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.14"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "6.19.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45865.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nmctp i2c: initialise event handler read bytes\n\nSet a 0xff value for i2c reads of an mctp-i2c device. Otherwise reads\nwill return \"val\" from the i2c bus driver. For i2c-aspeed and\ni2c-npcm7xx that is a stack uninitialised u8.\n\nTested with \"i2ctransfer -y 1 r10@0x34\" where 0x34 is a mctp-i2c\ninstance, now it returns all 0xff.",
  "id": "CVE-2026-45865",
  "modified": "2026-07-08T05:36:32.261140202Z",
  "published": "2026-05-27T12:15:45.082Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/11f83253244060b5de5eac787f61ae3f3e559d01"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1eeedb310229bfee9dd4d992e5bba33fe1378a8f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2a14e91b6d76639dac70ea170f4384c1ee3cb48d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6ff2ebfef75fbc57d937d8fbe738b967edf2d331"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/93e01e837e105299f1c259ef71f6e1ec4fe806e3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fa9861e5c8af7651dddfa8d490aaada17ae33b6c"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45865.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-45865"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.7.5",
  "summary": "mctp i2c: initialise event handler read bytes"
}