CVE-2026-45865 (GCVE-0-2026-45865)
Vulnerability from cvelistv5
Published
2026-05-27 12:15
Modified
2026-05-27 12:15
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: mctp i2c: initialise event handler read bytes Set a 0xff value for i2c reads of an mctp-i2c device. Otherwise reads will return "val" from the i2c bus driver. For i2c-aspeed and i2c-npcm7xx that is a stack uninitialised u8. Tested with "i2ctransfer -y 1 r10@0x34" where 0x34 is a mctp-i2c instance, now it returns all 0xff.
References
Impacted products
Vendor Product Version
Linux Linux Version: f5b8abf9fc3dacd7529d363e26fe8230935d65f8
Version: f5b8abf9fc3dacd7529d363e26fe8230935d65f8
Version: f5b8abf9fc3dacd7529d363e26fe8230935d65f8
Version: f5b8abf9fc3dacd7529d363e26fe8230935d65f8
Version: f5b8abf9fc3dacd7529d363e26fe8230935d65f8
Version: f5b8abf9fc3dacd7529d363e26fe8230935d65f8
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{
  "containers": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/mctp/mctp-i2c.c"
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          "vendor": "Linux",
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              "version": "7.0",
              "versionType": "original_commit_for_fix"
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      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
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                  "vulnerable": true
                },
                {
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              "negate": false,
              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-27T12:15:45.082Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/93e01e837e105299f1c259ef71f6e1ec4fe806e3"
        },
        {
          "url": "https://git.kernel.org/stable/c/11f83253244060b5de5eac787f61ae3f3e559d01"
        },
        {
          "url": "https://git.kernel.org/stable/c/fa9861e5c8af7651dddfa8d490aaada17ae33b6c"
        },
        {
          "url": "https://git.kernel.org/stable/c/6ff2ebfef75fbc57d937d8fbe738b967edf2d331"
        },
        {
          "url": "https://git.kernel.org/stable/c/1eeedb310229bfee9dd4d992e5bba33fe1378a8f"
        },
        {
          "url": "https://git.kernel.org/stable/c/2a14e91b6d76639dac70ea170f4384c1ee3cb48d"
        }
      ],
      "title": "mctp i2c: initialise event handler read bytes",
      "x_generator": {
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      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-45865",
    "datePublished": "2026-05-27T12:15:45.082Z",
    "dateReserved": "2026-05-13T15:03:33.080Z",
    "dateUpdated": "2026-05-27T12:15:45.082Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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