CVE-2026-90081 (GCVE-0-2026-90081)
Vulnerability from cvelistv5
Published
2026-09-17 16:05
Modified
2026-10-19 08:57
Severity ?
Summary
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's 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->m_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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 922cb17a5c812fcc9ebee249f4109db099896941
Version: 922cb17a5c812fcc9ebee249f4109db099896941
Version: 922cb17a5c812fcc9ebee249f4109db099896941
Version: 922cb17a5c812fcc9ebee249f4109db099896941
Version: 922cb17a5c812fcc9ebee249f4109db099896941
Version: 922cb17a5c812fcc9ebee249f4109db099896941
Version: 922cb17a5c812fcc9ebee249f4109db099896941
Version: 922cb17a5c812fcc9ebee249f4109db099896941
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{
  "containers": {
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          "product": "Linux",
          "programFiles": [
            "net/rds/cong.c"
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      ],
      "cpeApplicability": [
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          "nodes": [
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              "negate": false,
              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "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\u0027s 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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T08:57:37.791Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/2a809d7896dbf18e1ecfbdd930f71c9fc298b16d"
        },
        {
          "url": "https://git.kernel.org/stable/c/fa4b98e891fda28cc0638d809c6125ec63d8319d"
        },
        {
          "url": "https://git.kernel.org/stable/c/0e169f6a2adeb17b5577ed7e8abd642465bb50ec"
        },
        {
          "url": "https://git.kernel.org/stable/c/42884bd8b8fd023d6a610a695bd5ddd1d5dece17"
        },
        {
          "url": "https://git.kernel.org/stable/c/a526214b9f0548ca0e53a6e0d1727d8ea9befc23"
        },
        {
          "url": "https://git.kernel.org/stable/c/bf2b8130723efcb5b86c3ddb6317c3a9b2a9cfc5"
        },
        {
          "url": "https://git.kernel.org/stable/c/281f9fda2e06d6c211bb365a5379ed2e05cc2e21"
        },
        {
          "url": "https://git.kernel.org/stable/c/d4f484661961636eb90d287050959e613795f73a"
        }
      ],
      "title": "net/rds: use wq_has_sleeper() in rds_cong_map_updated()",
      "x_generator": {
        "engine": "bippy-1.2.0"
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-90081",
    "datePublished": "2026-09-17T16:05:58.866Z",
    "dateReserved": "2026-09-11T19:38:34.785Z",
    "dateUpdated": "2026-10-19T08:57:37.791Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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