{
  "cveId": "CVE-2025-21897",
  "url": "https://patchblox.com/security/cve/CVE-2025-21897",
  "summary": "CVE-2025-21897 is fixed in 36 products on 1 platform, first by DEBIAN-CVE-2025-21897, released April 1, 2025. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  sched_ext: Fix pick_task_scx() picking non-queue...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  sched_ext: Fix pick_task_scx() picking non-queued tasks when it\u0027s called without balance()  a6250aa251ea (\u0022sched_ext: Handle cases where pick_task_scx() is called without preceding balance_scx()\u0022) added a workaround to handle the cases where pick_task_scx() is called without prececing balance_scx() which is due to a fair class bug where pick_taks_fair() may return NULL after a true return from balance_fair().  The workaround detects when pick_task_scx() is called without preceding balance_scx() and emulates SCX_RQ_BAL_KEEP and triggers kicking to avoid stalling. Unfortunately, the workaround code was testing whether @prev was on SCX to decide whether to keep the task running. This is incorrect as the task may be on SCX but no longer runnable.  This could lead to a non-runnable task to be returned from pick_task_scx() which cause interesting confusions and failures. e.g. A common failure mode is the task ending up with (!on_rq \u0026\u0026 on_cpu) state which can cause potential wakers to busy loop, which can easily lead to deadlocks.  Fix it by testing whether @prev has SCX_TASK_QUEUED set. This makes @prev_on_scx only used in one place. Open code the usage and improve the comment while at it.",
  "published": "2025-04-01T16:15:20Z",
  "severity": "medium",
  "cvss": 5.5,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
  "epss": 0.00154,
  "epssPercentile": 0.04551,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
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