{
  "cveId": "CVE-2026-23473",
  "url": "https://patchblox.com/security/cve/CVE-2026-23473",
  "summary": "CVE-2026-23473 is fixed in 68 products on 1 platform, first by DEBIAN-CVE-2026-23473, released April 3, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "io_uring/poll: fix multishot recv missing EOF on wakeup race",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  io_uring/poll: fix multishot recv missing EOF on wakeup race  When a socket send and shutdown() happen back-to-back, both fire wake-ups before the receiver\u0027s task_work has a chance to run. The first wake gets poll ownership (poll_refs=1), and the second bumps it to 2. When io_poll_check_events() runs, it calls io_poll_issue() which does a recv that reads the data and returns IOU_RETRY. The loop then drains all accumulated refs (atomic_sub_return(2) -\u003E 0) and exits, even though only the first event was consumed. Since the shutdown is a persistent state change, no further wakeups will happen, and the multishot recv can hang forever.  Check specifically for HUP in the poll loop, and ensure that another loop is done to check for status if more than a single poll activation is pending. This ensures we don\u0027t lose the shutdown event.",
  "published": "2026-04-03T16:16:35Z",
  "severity": "Moderate",
  "cvss": 4.7,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-23473",
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