{
  "cveId": "CVE-2026-72071",
  "url": "https://patchblox.com/security/cve/CVE-2026-72071",
  "summary": "CVE-2026-72071 is fixed in 38 products on 1 platform, first by DEBIAN-CVE-2026-72071, released August 15, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  tracing/user_events: Fix use-after-free in user_...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  tracing/user_events: Fix use-after-free in user_event_mm_dup()  user_event_mm_dup() walks the parent mm\u0027s enabler list locklessly under rcu_read_lock() during fork() (from copy_process()); it does not take event_mutex:  \trcu_read_lock(); \tlist_for_each_entry_rcu(enabler, \u0026old_mm-\u003Eenablers, mm_enablers_link) \t\tenabler-\u003Eevent = user_event_get(orig-\u003Eevent);  user_event_enabler_destroy() removes an enabler from that list with list_del_rcu() and then, without waiting for a grace period, drops the enabler\u0027s user_event reference with user_event_put() and frees the enabler with kfree(). A reader that loaded the enabler before the list_del_rcu() can still be walking it, which leads to two use-after-frees:   - kfree(enabler) frees the enabler while that reader dereferences    enabler-\u003Eevent.   - user_event_put() may drop the last reference to the user_event, which    is then freed (via delayed_destroy_user_event() on a work queue), while    the same reader does user_event_get(orig-\u003Eevent) on it.  Both are reachable by an unprivileged task that can open user_events_data: one multithreaded process that registers an enabler and then concurrently unregisters it and calls fork() triggers the race. KASAN reports a slab-use-after-free in user_event_mm_dup() during clone(), with a \u0022refcount_t: addition on 0\u0022 warning when the user_event is freed.  The enabler use-after-free was found first; the user_event one was reported by XIAO WU, and the earlier enabler-only fix did not address it.  Defer both the user_event_put() and the kfree(enabler) to a work item queued with queue_rcu_work(), so they run only after an RCU grace period, once all readers walking the enabler list have finished. The put must run in process context because user_event_put() takes event_mutex on the last reference, so a work queue is used rather than call_rcu(). The now-unlocked put lets the locked argument of user_event_enabler_destroy() be removed; all callers are updated.",
  "published": "2026-08-15T06:21:16Z",
  "severity": "high",
  "cvss": 7.8,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
  "epss": 0.0017,
  "epssPercentile": 0.06432,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
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  "noFixYet": [],
  "dataAsOf": "2026-11-08T00:53:09Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
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}