{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "922cb17a5c812fcc9ebee249f4109db099896941"
            },
            {
              "fixed": "2a809d7896dbf18e1ecfbdd930f71c9fc298b16d"
            },
            {
              "fixed": "fa4b98e891fda28cc0638d809c6125ec63d8319d"
            },
            {
              "fixed": "0e169f6a2adeb17b5577ed7e8abd642465bb50ec"
            },
            {
              "fixed": "42884bd8b8fd023d6a610a695bd5ddd1d5dece17"
            },
            {
              "fixed": "a526214b9f0548ca0e53a6e0d1727d8ea9befc23"
            },
            {
              "fixed": "bf2b8130723efcb5b86c3ddb6317c3a9b2a9cfc5"
            },
            {
              "fixed": "281f9fda2e06d6c211bb365a5379ed2e05cc2e21"
            },
            {
              "fixed": "d4f484661961636eb90d287050959e613795f73a"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.6.30"
            },
            {
              "fixed": "5.10.270"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.221"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.188"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.157"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.110"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.52"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.2.6"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90081.json"
  },
  "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-\u003em_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.",
  "id": "CVE-2026-90081",
  "modified": "2026-09-19T03:30:24.666893121Z",
  "published": "2026-09-17T16:05:58.866Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0e169f6a2adeb17b5577ed7e8abd642465bb50ec"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/281f9fda2e06d6c211bb365a5379ed2e05cc2e21"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2a809d7896dbf18e1ecfbdd930f71c9fc298b16d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/42884bd8b8fd023d6a610a695bd5ddd1d5dece17"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a526214b9f0548ca0e53a6e0d1727d8ea9befc23"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bf2b8130723efcb5b86c3ddb6317c3a9b2a9cfc5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d4f484661961636eb90d287050959e613795f73a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fa4b98e891fda28cc0638d809c6125ec63d8319d"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90081.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-90081"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "net/rds: use wq_has_sleeper() in rds_cong_map_updated()"
}