{
  "cveId": "CVE-2026-64112",
  "url": "https://patchblox.com/security/cve/CVE-2026-64112",
  "summary": "CVE-2026-64112 is fixed in 53 products on 1 platform, first by ALAS2023-2026-1894, released June 22, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "rbd: eliminate a race in lock_dwork draining on unmap",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  rbd: eliminate a race in lock_dwork draining on unmap  Given how rbd_lock_add_request() and rbd_img_exclusive_lock() are written, lock_dwork may be (re)queued more than it\u0027s actually needed: for example in case a new I/O request comes in while we are in the middle of rbd_acquire_lock() on behalf of another I/O request.  This is expected and with rbd_release_lock() preemptively canceling lock_dwork is benign under normal operation.  A more problematic example is maybe_kick_acquire():      if (have_requests || delayed_work_pending(\u0026rbd_dev-\u003Elock_dwork)) {             dout(\u0022%s rbd_dev %p kicking lock_dwork\\n\u0022, __func__, rbd_dev);             mod_delayed_work(rbd_dev-\u003Etask_wq, \u0026rbd_dev-\u003Elock_dwork, 0);     }  It\u0027s not unrealistic for lock_dwork to get canceled right after delayed_work_pending() returns true and for mod_delayed_work() to requeue it right there anyway.  This is a classic TOCTOU race.  When it comes to unmapping the image, there is an implicit assumption of no self-initiated exclusive lock activity past the point of return from rbd_dev_image_unlock() which unlocks the lock if it happens to be held.  This unlock is assumed to be final and lock_dwork (as well as all other exclusive lock tasks, really) isn\u0027t expected to get queued again.  However, lock_dwork is canceled only in cancel_tasks_sync() (i.e. later in the unmap sequence) and on top of that the cancellation can get in effect nullified by maybe_kick_acquire().  This may result in rbd_acquire_lock() executing after rbd_dev_device_release() and rbd_dev_image_release() run and free and/or reset a bunch of things. One of the possible failure modes then is a violated      rbd_assert(rbd_image_format_valid(rbd_dev-\u003Eimage_format));  in rbd_dev_header_info() which is called via rbd_dev_refresh() from rbd_post_acquire_action().  Redo exclusive lock task draining to provide saner semantics and try to meet the assumptions around rbd_dev_image_unlock().",
  "published": "2026-06-22T09:00:00Z",
  "severity": "Important",
  "cvss": 7.8,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
  "epss": 0.001,
  "epssPercentile": 0.00836,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-64112",
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      "fix": "ALAS2023-2026-1894",
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      "released": "2026-06-22T09:00:00Z"
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      "fix": "ALAS2023-2026-1881",
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