{
  "cveId": "CVE-2026-89518",
  "url": "https://patchblox.com/security/cve/CVE-2026-89518",
  "summary": "CVE-2026-89518 is fixed in linux on 1 platform by DEBIAN-CVE-2026-89518 (version 7.2.6-1), 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:  sched_ext: Fix this_rq() assumptions in dispatch...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  sched_ext: Fix this_rq() assumptions in dispatch kfuncs  Under core scheduling, dispatch runs from within the core-wide pick and can target a sibling rq, so ops.dispatch() may execute on a CPU different from the dispatched rq\u0027s. Several kfunc paths assumed the two always coincide:  - scx_dsq_move() decided whether an rq lock is held by testing this_rq()\u0027s   rq flags and lock-danced accordingly. A dispatch for a sibling took the   unlocked-context branch and acquired the source rq lock on top of the   already held dispatched rq lock which could deadlock.  - scx_bpf_sub_dispatch() dispatched this_rq() with its stashed   sub_dispatch_prev, which is NULL when dispatching for a sibling.  - finish_dispatch(), scx_bpf_dsq_reenq() and scx_bpf_dsq_nr_queued()   resolved SCX_DSQ_LOCAL to this CPU\u0027s local DSQ rather than the dispatched   rq\u0027s. The latter two are callable from other rq-locked operations too,   where SCX_DSQ_LOCAL now likewise resolves to the op\u0027s rq. This changes   behavior also without core scheduling, e.g. for ops.enqueue() running a   remote wakeup on the waking CPU, and is intended: which CPU happens to   execute an operation is incidental, the op\u0027s rq is what it is operating   on, and the resolution now matches the insert side where SCX_DSQ_LOCAL   dispatches land on the task\u0027s rq.  Use the rq tracked by scx_locked_rq(), which is set to the dispatched rq around ops invocations and NULL in unlocked contexts.",
  "published": "2026-09-11T20:19:34Z",
  "severity": "",
  "epss": 0.00198,
  "epssPercentile": 0.09577,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "7.2.6-1",
      "fix": "DEBIAN-CVE-2026-89518",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-89518",
      "released": "2026-09-23T19:19:02Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-09T13:31:49Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}