{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Rejected reason: This CVE ID has been rejected or withdrawn by its CVE Numbering Authority."
    }
  ],
  "id": "CVE-2026-23473",
  "lastModified": "2026-05-02T07:16:18.483",
  "metrics": {},
  "published": "2026-04-03T16:16:35.120",
  "references": [],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Rejected"
}

{
  "affected": [],
  "aliases": [
    "CVE-2026-23473"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-04-03T16:16:35Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nio_uring/poll: fix multishot recv missing EOF on wakeup race\n\nWhen a socket send and shutdown() happen back-to-back, both fire\nwake-ups before the receiver\u0027s task_work has a chance to run. The first\nwake gets poll ownership (poll_refs=1), and the second bumps it to 2.\nWhen io_poll_check_events() runs, it calls io_poll_issue() which does a\nrecv that reads the data and returns IOU_RETRY. The loop then drains all\naccumulated refs (atomic_sub_return(2) -\u003e 0) and exits, even though only\nthe first event was consumed. Since the shutdown is a persistent state\nchange, no further wakeups will happen, and the multishot recv can hang\nforever.\n\nCheck specifically for HUP in the poll loop, and ensure that another\nloop is done to check for status if more than a single poll activation\nis pending. This ensures we don\u0027t lose the shutdown event.",
  "id": "GHSA-c5mp-x9x5-3g5v",
  "modified": "2026-04-03T18:31:22Z",
  "published": "2026-04-03T18:31:22Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-23473"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0f4ce79b8db7b040373fc664c8bc6c5fd74bd196"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a68ed2df72131447d131531a08fe4dfcf4fa4653"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bf33554b6abf7e7faeadd8af1b82037ea755a6bb"
    }
  ],
  "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-2026-23473 io_uring/poll: fix multishot recv missing EOF on wakeup race - VEX",
        "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-23473.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": "io_uring/poll: fix multishot recv missing EOF on wakeup race",
    "tracking": {
      "current_release_date": "2026-04-29T14:44:47.000Z",
      "generator": {
        "date": "2026-04-30T08:42:48.121Z",
        "engine": {
          "name": "MSRC Generator",
          "version": "1.0"
        }
      },
      "id": "msrc_CVE-2026-23473",
      "initial_release_date": "2026-04-02T00:00:00.000Z",
      "revision_history": [
        {
          "date": "2026-04-05T01:01:50.000Z",
          "legacy_version": "1",
          "number": "1",
          "summary": "Information published."
        },
        {
          "date": "2026-04-07T01:41:05.000Z",
          "legacy_version": "2",
          "number": "2",
          "summary": "Information published."
        },
        {
          "date": "2026-04-29T14:44:47.000Z",
          "legacy_version": "3",
          "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 0:6.6.130.1-3.azl3",
                "product": {
                  "name": "azl3 kernel 0:6.6.130.1-3.azl3",
                  "product_id": "2"
                }
              },
              {
                "category": "product_version_range",
                "name": "azl3 kernel 0:6.6.134.1-2.azl3",
                "product": {
                  "name": "azl3 kernel 0:6.6.134.1-2.azl3",
                  "product_id": "1"
                }
              }
            ],
            "category": "product_name",
            "name": "kernel"
          }
        ],
        "category": "vendor",
        "name": "Microsoft"
      }
    ],
    "relationships": [
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "azl3 kernel 0:6.6.130.1-3.azl3 as a component of Azure Linux 3.0",
          "product_id": "17084-2"
        },
        "product_reference": "2",
        "relates_to_product_reference": "17084"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "azl3 kernel 0:6.6.134.1-2.azl3 as a component of Azure Linux 3.0",
          "product_id": "17084-1"
        },
        "product_reference": "1",
        "relates_to_product_reference": "17084"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-23473",
      "notes": [
        {
          "category": "general",
          "text": "Linux",
          "title": "Assigning CNA"
        }
      ],
      "product_status": {
        "known_affected": [
          "17084-2",
          "17084-1"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-23473 io_uring/poll: fix multishot recv missing EOF on wakeup race - VEX",
          "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-23473.json"
        }
      ],
      "remediations": [
        {
          "category": "none_available",
          "date": "2026-04-05T01:01:50.000Z",
          "details": "There is no fix available for this vulnerability as of now",
          "product_ids": [
            "17084-2"
          ]
        },
        {
          "category": "none_available",
          "date": "2026-04-05T01:01:50.000Z",
          "details": "There is no fix available for this vulnerability as of now",
          "product_ids": [
            "17084-1"
          ]
        }
      ],
      "title": "io_uring/poll: fix multishot recv missing EOF on wakeup race"
    }
  ]
}