{
  "cveId": "CVE-2026-90081",
  "url": "https://patchblox.com/security/cve/CVE-2026-90081",
  "summary": "CVE-2026-90081 is fixed in 57 products on 1 platform, first by DEBIAN-CVE-2026-90081, released September 23, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "net/rds: use wq_has_sleeper() in rds_cong_map_updated()",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  net/rds: use wq_has_sleeper() in rds_cong_map_updated()  rds_cong_map_updated() runs after a peer\u0027s congestion map has been rewritten (by rds_tcp_cong_recv() and rds_ib_cong_recv(), or the clear-all in the loopback and IB send-completion paths).  It bumps rds_cong_generation and then checks waitqueue_active() on map-\u003Em_waitq and on rds_poll_waitq to decide whether anyone needs waking.  atomic_inc() carries no ordering and waitqueue_active() is a plain load, so nothing orders the map and generation stores before the wait queue reads.  The waiters do the mirror image: rds_cong_wait() adds itself to m_waitq and then tests the port bit, and rds_poll() registers on rds_poll_waitq and then reads the generation.  That is the store-buffering pattern described above waitqueue_active() in include/linux/wait.h - the updater can observe an empty wait queue while the waiter still observes the port as congested, and no wake-up is issued.  rds_cong_wait() is an interruptible sleep with no timeout, so a sender blocked on a congested port stays blocked until the next congestion update from that peer arrives or a signal is delivered. A poll() waiter misses the map-updated notification the same way.  Use wq_has_sleeper(), which is waitqueue_active() preceded by the required full barrier, as rds_tcp_state_change() already does for the same pattern.",
  "published": "2026-09-17T17:16:57Z",
  "severity": "Important",
  "cvss": 7.8,
  "epss": 0.00216,
  "epssPercentile": 0.12143,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-90081",
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      "released": "2026-11-07T01:06:07Z"
    },
    {
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      "fix": "ALAS2023-2026-3197",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3197",
      "released": "2026-11-07T01:06:07Z"
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      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3196",
      "released": "2026-11-07T01:06:07Z"
    },
    {
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      "release": "amzn 2023",
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      "fix": "ALAS2023-2026-3196",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3196",
      "released": "2026-11-07T01:06:07Z"
    },
    {
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      "fix": "ALAS2023-2026-3192",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3192",
      "released": "2026-11-07T01:06:07Z"
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    {
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      "release": "amzn 2023",
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      "fix": "ALAS2023-2026-3192",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3192",
      "released": "2026-11-07T01:06:07Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-09T01:18:40Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}