Vulnerability-Lookup

GHSA-6J35-QR59-823Q

Vulnerability from github – Published: 2026-05-27 15:33 – Updated: 2026-05-27 15:33

Details

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.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-45865"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-27T14:16:58Z",
    "severity": null
  },
  "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": "GHSA-6j35-qr59-823q",
  "modified": "2026-05-27T15:33:13Z",
  "published": "2026-05-27T15:33:13Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-45865"
    },
    {
      "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"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-45865 (GCVE-0-2026-45865)

Vulnerability from cvelistv5 – Published: 2026-05-27 12:15 – Updated: 2026-05-27 12:15

Title

mctp i2c: initialise event handler read bytes

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.

Severity

No CVSS data available.

Assigner

Linux

References

6 references

URL	Tags
https://git.kernel.org/stable/c/93e01e837e105299f…
https://git.kernel.org/stable/c/11f83253244060b5d…
https://git.kernel.org/stable/c/fa9861e5c8af7651d…
https://git.kernel.org/stable/c/6ff2ebfef75fbc57d…
https://git.kernel.org/stable/c/1eeedb310229bfee9…
https://git.kernel.org/stable/c/2a14e91b6d76639da…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: f5b8abf9fc3dacd7529d363e26fe8230935d65f8 , < 93e01e837e105299f1c259ef71f6e1ec4fe806e3 (git) Affected: f5b8abf9fc3dacd7529d363e26fe8230935d65f8 , < 11f83253244060b5de5eac787f61ae3f3e559d01 (git) Affected: f5b8abf9fc3dacd7529d363e26fe8230935d65f8 , < fa9861e5c8af7651dddfa8d490aaada17ae33b6c (git) Affected: f5b8abf9fc3dacd7529d363e26fe8230935d65f8 , < 6ff2ebfef75fbc57d937d8fbe738b967edf2d331 (git) Affected: f5b8abf9fc3dacd7529d363e26fe8230935d65f8 , < 1eeedb310229bfee9dd4d992e5bba33fe1378a8f (git) Affected: f5b8abf9fc3dacd7529d363e26fe8230935d65f8 , < 2a14e91b6d76639dac70ea170f4384c1ee3cb48d (git)
Linux	Linux	Affected: 5.18 Unaffected: 0 , < 5.18 (semver) Unaffected: 6.1.165 , ≤ 6.1.* (semver) Unaffected: 6.6.128 , ≤ 6.6.* (semver) Unaffected: 6.12.75 , ≤ 6.12.* (semver) Unaffected: 6.18.14 , ≤ 6.18.* (semver) Unaffected: 6.19.4 , ≤ 6.19.* (semver) Unaffected: 7.0 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/mctp/mctp-i2c.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "93e01e837e105299f1c259ef71f6e1ec4fe806e3",
              "status": "affected",
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              "versionType": "git"
            },
            {
              "lessThan": "11f83253244060b5de5eac787f61ae3f3e559d01",
              "status": "affected",
              "version": "f5b8abf9fc3dacd7529d363e26fe8230935d65f8",
              "versionType": "git"
            },
            {
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              "status": "affected",
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              "versionType": "git"
            },
            {
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              "status": "affected",
              "version": "f5b8abf9fc3dacd7529d363e26fe8230935d65f8",
              "versionType": "git"
            },
            {
              "lessThan": "1eeedb310229bfee9dd4d992e5bba33fe1378a8f",
              "status": "affected",
              "version": "f5b8abf9fc3dacd7529d363e26fe8230935d65f8",
              "versionType": "git"
            },
            {
              "lessThan": "2a14e91b6d76639dac70ea170f4384c1ee3cb48d",
              "status": "affected",
              "version": "f5b8abf9fc3dacd7529d363e26fe8230935d65f8",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/mctp/mctp-i2c.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.18"
            },
            {
              "lessThan": "5.18",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.165",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.128",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.75",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.14",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.165",
                  "versionStartIncluding": "5.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "5.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.75",
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                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.14",
                  "versionStartIncluding": "5.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19.4",
                  "versionStartIncluding": "5.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0",
                  "versionStartIncluding": "5.18",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "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"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

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.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
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.

Action not permitted

GHSA-6J35-QR59-823Q

CVE-2026-45865 (GCVE-0-2026-45865)

Tags

Sightings

Nomenclature