{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/rxe: Validate pad and ICRC before payload_size() in rxe_rcv\n\nrxe_rcv() currently checks only that the incoming packet is at least\nheader_size(pkt) bytes long before payload_size() is used.\n\nHowever, payload_size() subtracts both the attacker-controlled BTH pad\nfield and RXE_ICRC_SIZE from pkt-\u003epaylen:\n\n  payload_size = pkt-\u003epaylen - offset[RXE_PAYLOAD] - bth_pad(pkt)\n                 - RXE_ICRC_SIZE\n\nThis means a short packet can still make payload_size() underflow even\nif it includes enough bytes for the fixed headers. Simply requiring\nheader_size(pkt) + RXE_ICRC_SIZE is not sufficient either, because a\npacket with a forged non-zero BTH pad can still leave payload_size()\nnegative and pass an underflowed value to later receive-path users.\n\nFix this by validating pkt-\u003epaylen against the full minimum length\nrequired by payload_size(): header_size(pkt) + bth_pad(pkt) +\nRXE_ICRC_SIZE."
    }
  ],
  "id": "CVE-2026-46043",
  "lastModified": "2026-05-27T14:48:03.013",
  "metrics": {},
  "published": "2026-05-27T14:17:23.743",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/2fd4f8b749309a61c3f3f88ee8891d94f79e1240"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/7244491dab347f648e661da96dc0febadd9daec3"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/9b924f3a26b21330a837cfe72e819b6393bbeeaa"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/e8ee0e792d475b1067c199ef0af1b6221fa6f43d"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/f83519a4c122c9c7a850a2197648a9ff4c67c520"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2026-46043"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-27T14:17:23Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/rxe: Validate pad and ICRC before payload_size() in rxe_rcv\n\nrxe_rcv() currently checks only that the incoming packet is at least\nheader_size(pkt) bytes long before payload_size() is used.\n\nHowever, payload_size() subtracts both the attacker-controlled BTH pad\nfield and RXE_ICRC_SIZE from pkt-\u003epaylen:\n\n  payload_size = pkt-\u003epaylen - offset[RXE_PAYLOAD] - bth_pad(pkt)\n                 - RXE_ICRC_SIZE\n\nThis means a short packet can still make payload_size() underflow even\nif it includes enough bytes for the fixed headers. Simply requiring\nheader_size(pkt) + RXE_ICRC_SIZE is not sufficient either, because a\npacket with a forged non-zero BTH pad can still leave payload_size()\nnegative and pass an underflowed value to later receive-path users.\n\nFix this by validating pkt-\u003epaylen against the full minimum length\nrequired by payload_size(): header_size(pkt) + bth_pad(pkt) +\nRXE_ICRC_SIZE.",
  "id": "GHSA-ww3w-m544-ppj6",
  "modified": "2026-05-27T15:33:22Z",
  "published": "2026-05-27T15:33:21Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-46043"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2fd4f8b749309a61c3f3f88ee8891d94f79e1240"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7244491dab347f648e661da96dc0febadd9daec3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9b924f3a26b21330a837cfe72e819b6393bbeeaa"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e8ee0e792d475b1067c199ef0af1b6221fa6f43d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f83519a4c122c9c7a850a2197648a9ff4c67c520"
    }
  ],
  "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-2026-46043 RDMA/rxe: Validate pad and ICRC before payload_size() in rxe_rcv - VEX",
        "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-46043.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": "RDMA/rxe: Validate pad and ICRC before payload_size() in rxe_rcv",
    "tracking": {
      "current_release_date": "2026-05-29T01:53:42.000Z",
      "generator": {
        "date": "2026-05-29T07:23:45.792Z",
        "engine": {
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      "initial_release_date": "2026-05-02T00:00:00.000Z",
      "revision_history": [
        {
          "date": "2026-05-28T01:07:54.000Z",
          "legacy_version": "1",
          "number": "1",
          "summary": "Information published."
        },
        {
          "date": "2026-05-28T14:51:50.000Z",
          "legacy_version": "1.1",
          "number": "2",
          "summary": "Information published."
        },
        {
          "date": "2026-05-29T01:53:42.000Z",
          "legacy_version": "2",
          "number": "3",
          "summary": "Information published."
        }
      ],
      "status": "final",
      "version": "3"
    }
  },
  "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-2026-46043",
      "notes": [
        {
          "category": "general",
          "text": "Linux",
          "title": "Assigning CNA"
        }
      ],
      "product_status": {
        "known_affected": [
          "17084-1"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-46043 RDMA/rxe: Validate pad and ICRC before payload_size() in rxe_rcv - VEX",
          "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-46043.json"
        }
      ],
      "remediations": [
        {
          "category": "none_available",
          "date": "2026-05-28T01:07:54.000Z",
          "details": "There is no fix available for this vulnerability as of now",
          "product_ids": [
            "17084-1"
          ]
        }
      ],
      "title": "RDMA/rxe: Validate pad and ICRC before payload_size() in rxe_rcv"
    }
  ]
}