{
  "cveId": "CVE-2026-90183",
  "url": "https://patchblox.com/security/cve/CVE-2026-90183",
  "summary": "CVE-2026-90183 is fixed in 16 products on 1 platform, first by DEBIAN-CVE-2026-90183, released September 23, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  blk-iolatency: clear delay state when freeing po...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  blk-iolatency: clear delay state when freeing policy data  io.latency can throttle a group which has no latency target of its own. When a sibling misses its target, check_scale_change() scales down its peers, and a peer that reaches queue depth one gets blkcg_use_delay() called on it on every further scale-down, even with min_lat_nsec == 0.  iolatency_pd_offline() resets the target through iolatency_set_min_lat_nsec(), which clears the delay only on a nonzero to zero transition, so it never clears such a peer.  Freeing the policy data then leaves blkg-\u003Euse_delay set and blkcg-\u003Econgestion_count elevated with nothing left that can drop it.  blk_cgroup_congested() then returns true for every task in that cgroup and its descendants for as long as the cgroup lives: page_cache_sync_ra() cuts readahead to a single page, page_cache_async_ra() skips it altogether, and __folio_throttle_swaprate() takes swap_avail_lock and schedules a throttle on anonymous folio allocation.  Clear the delay in iolatency_pd_free().  By then bio-held blkg references have drained, or the queue is frozen for policy deactivation, so check_scale_change() cannot re-arm it.  The free callback can also see policy data which was never attached to a blkg, hence the pd-\u003Eblkg check.",
  "published": "2026-09-17T17:17:12Z",
  "severity": "",
  "epss": 0.00206,
  "epssPercentile": 0.10759,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
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      "fix": "OPENSUSE-SU-2026:22091-1",
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      "released": "2026-11-07T00:47:19Z"
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      "released": "2026-11-07T00:43:02Z"
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  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T06:59:42Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}