{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-90081",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2026-90081"
  ],
  "published": "2026-09-17T16:10:40Z",
  "summary": "net/rds: use wq_has_sleeper() in rds_cong_map_updated()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/rds: use wq_has_sleeper() in rds_cong_map_updated()\n\nrds_cong_map_updated() runs after a peer's congestion map has been\nrewritten (by rds_tcp_cong_recv() and rds_ib_cong_recv(), or the\nclear-all in the loopback and IB send-completion paths).  It bumps\nrds_cong_generation and then checks waitqueue_active() on\nmap->m_waitq and on rds_poll_waitq to decide whether anyone needs\nwaking.  atomic_inc() carries no ordering and waitqueue_active() is a\nplain load, so nothing orders the map and generation stores before\nthe wait queue reads.  The waiters do the mirror image: rds_cong_wait()\nadds itself to m_waitq and then tests the port bit, and rds_poll()\nregisters on rds_poll_waitq and then reads the generation.  That is\nthe store-buffering pattern described above waitqueue_active() in\ninclude/linux/wait.h - the updater can observe an empty wait queue\nwhile the waiter still observes the port as congested, and no wake-up\nis issued.\n\nrds_cong_wait() is an interruptible sleep with no timeout, so a\nsender blocked on a congested port stays blocked until the next\ncongestion update from that peer arrives or a signal is delivered.\nA poll() waiter misses the map-updated notification the same way.\n\nUse wq_has_sleeper(), which is waitqueue_active() preceded by the\nrequired full barrier, as rds_tcp_state_change() already does for\nthe same pattern.",
  "affected": [
    {
      "package": {
        "ecosystem": "Raspberry Pi OS:12",
        "name": "linux"
      },
      "versions": [
        "1:6.1.47-1+rpt4"
      ],
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-2712",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v6",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7l",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v8",
            "binary_version": "1:6.1.47-1+rpt4"
          }
        ]
      },
      "database_specific": {
        "per_version": {
          "1:6.1.47-1+rpt4": {
            "linux_commit": "655fc658a15ae7a6f37103754adb39ba52a9a14e",
            "upstream_version": "6.1.47",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.1.188",
            "compiled_filter": false
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-90081"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/2a809d7896dbf18e1ecfbdd930f71c9fc298b16d"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/fa4b98e891fda28cc0638d809c6125ec63d8319d"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/0e169f6a2adeb17b5577ed7e8abd642465bb50ec"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/42884bd8b8fd023d6a610a695bd5ddd1d5dece17"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/a526214b9f0548ca0e53a6e0d1727d8ea9befc23"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/bf2b8130723efcb5b86c3ddb6317c3a9b2a9cfc5"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/281f9fda2e06d6c211bb365a5379ed2e05cc2e21"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/d4f484661961636eb90d287050959e613795f73a"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-09-17T16:10:40Z"
  }
}