{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nibmasm: fix OOB reads in command_file_write due to missing size checks\n\nThe command_file_write() handler allocates a kernel buffer of exactly\ncount bytes and copies user data into it, but does not validate the\nbuffer against the dot command protocol before passing it to\nget_dot_command_size() and get_dot_command_timeout().\n\nSince both the allocation size (count) and the header fields (command_size,\ndata_size) are independently user-controlled, an attacker can cause\nget_dot_command_size() to return a value exceeding the allocation,\ntriggering OOB reads in get_dot_command_timeout() and an out-of-bounds\nmemcpy_toio() that leaks kernel heap memory to the service processor.\n\nFix with two guards: reject writes smaller than sizeof(struct\ndot_command_header) before allocation, then after copying user data\nreject commands where the buffer is smaller than the total size declared\nby the header (sizeof(header) + command_size + data_size). This ensures\nall subsequent header and payload field accesses stay within the buffer."
    }
  ],
  "id": "CVE-2026-45994",
  "lastModified": "2026-05-27T14:48:03.013",
  "metrics": {},
  "published": "2026-05-27T14:17:16.970",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/0eb09f737428e482a32a2e31e5e223f2b35a71d3"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/a672682d39dd34e2b5ba4feb436723bed65125ff"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/aefc1a97da17d8309974690c8a03e439a91ebb1c"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/d0fb4d1dc43f8d5179917a2daaa82680993d4cdf"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/ee5737891464030a189837467df3b81a273718ad"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2026-45994"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-27T14:17:16Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nibmasm: fix OOB reads in command_file_write due to missing size checks\n\nThe command_file_write() handler allocates a kernel buffer of exactly\ncount bytes and copies user data into it, but does not validate the\nbuffer against the dot command protocol before passing it to\nget_dot_command_size() and get_dot_command_timeout().\n\nSince both the allocation size (count) and the header fields (command_size,\ndata_size) are independently user-controlled, an attacker can cause\nget_dot_command_size() to return a value exceeding the allocation,\ntriggering OOB reads in get_dot_command_timeout() and an out-of-bounds\nmemcpy_toio() that leaks kernel heap memory to the service processor.\n\nFix with two guards: reject writes smaller than sizeof(struct\ndot_command_header) before allocation, then after copying user data\nreject commands where the buffer is smaller than the total size declared\nby the header (sizeof(header) + command_size + data_size). This ensures\nall subsequent header and payload field accesses stay within the buffer.",
  "id": "GHSA-rcq2-mghh-wcf4",
  "modified": "2026-05-27T15:33:20Z",
  "published": "2026-05-27T15:33:20Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-45994"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0eb09f737428e482a32a2e31e5e223f2b35a71d3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a672682d39dd34e2b5ba4feb436723bed65125ff"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/aefc1a97da17d8309974690c8a03e439a91ebb1c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d0fb4d1dc43f8d5179917a2daaa82680993d4cdf"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ee5737891464030a189837467df3b81a273718ad"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

{
  "document": {
    "category": "csaf_vex",
    "csaf_version": "2.0",
    "distribution": {
      "text": "Public",
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "en-US",
    "notes": [
      {
        "category": "general",
        "text": "To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle",
        "title": "Additional Resources"
      },
      {
        "category": "legal_disclaimer",
        "text": "The information provided in the Microsoft Knowledge Base is provided \\\"as is\\\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.",
        "title": "Disclaimer"
      }
    ],
    "publisher": {
      "category": "vendor",
      "contact_details": "secure@microsoft.com",
      "name": "Microsoft Security Response Center",
      "namespace": "https://msrc.microsoft.com"
    },
    "references": [
      {
        "category": "self",
        "summary": "CVE-2026-45994 ibmasm: fix OOB reads in command_file_write due to missing size checks - VEX",
        "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-45994.json"
      },
      {
        "category": "external",
        "summary": "Microsoft Support Lifecycle",
        "url": "https://support.microsoft.com/lifecycle"
      },
      {
        "category": "external",
        "summary": "Common Vulnerability Scoring System",
        "url": "https://www.first.org/cvss"
      }
    ],
    "title": "ibmasm: fix OOB reads in command_file_write due to missing size checks",
    "tracking": {
      "current_release_date": "2026-05-28T14:51:55.000Z",
      "generator": {
        "date": "2026-05-29T07:23:45.792Z",
        "engine": {
          "name": "MSRC Generator",
          "version": "1.0"
        }
      },
      "id": "msrc_CVE-2026-45994",
      "initial_release_date": "2026-05-02T00:00:00.000Z",
      "revision_history": [
        {
          "date": "2026-05-28T01:08:00.000Z",
          "legacy_version": "1",
          "number": "1",
          "summary": "Information published."
        },
        {
          "date": "2026-05-28T14:51:55.000Z",
          "legacy_version": "2",
          "number": "2",
          "summary": "Information published."
        }
      ],
      "status": "final",
      "version": "2"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version",
                "name": "3.0",
                "product": {
                  "name": "Azure Linux 3.0",
                  "product_id": "17084"
                }
              }
            ],
            "category": "product_name",
            "name": "Azure Linux"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "azl3 kernel 0:6.6.139.1-1.azl3",
                "product": {
                  "name": "azl3 kernel 0:6.6.139.1-1.azl3",
                  "product_id": "1"
                }
              }
            ],
            "category": "product_name",
            "name": "kernel"
          }
        ],
        "category": "vendor",
        "name": "Microsoft"
      }
    ],
    "relationships": [
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "azl3 kernel 0:6.6.139.1-1.azl3 as a component of Azure Linux 3.0",
          "product_id": "17084-1"
        },
        "product_reference": "1",
        "relates_to_product_reference": "17084"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-45994",
      "notes": [
        {
          "category": "general",
          "text": "Linux",
          "title": "Assigning CNA"
        }
      ],
      "product_status": {
        "known_affected": [
          "17084-1"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-45994 ibmasm: fix OOB reads in command_file_write due to missing size checks - VEX",
          "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-45994.json"
        }
      ],
      "remediations": [
        {
          "category": "none_available",
          "date": "2026-05-28T01:08:00.000Z",
          "details": "There is no fix available for this vulnerability as of now",
          "product_ids": [
            "17084-1"
          ]
        }
      ],
      "title": "ibmasm: fix OOB reads in command_file_write due to missing size checks"
    }
  ]
}