{
  "cveId": "CVE-2026-89791",
  "url": "https://patchblox.com/security/cve/CVE-2026-89791",
  "summary": "CVE-2026-89791 is fixed in 106 products on 1 platform, first by DEBIAN-CVE-2026-89791, released September 23, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  perf: Fix use-after-free when perf mmap() reviva...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  perf: Fix use-after-free when perf mmap() revival races with the last munmap()  perf_mmap_close() drops rb-\u003Emmap_count *without* holding event-\u003Emmap_mutex (the refcount_dec_and_test() right before the refcount_dec_and_mutex_lock() of event-\u003Emmap_count). A concurrent perf_mmap_rb() can slot its entire \u0022revival\u0022 path into that window (perf_mmap holds event-\u003Emmap_mutex for its whole duration, including rb_alloc):    munmap side (perf_mmap_close)          mmap side (perf_mmap_rb)   -----------------------------------    --------------------------------   rb-\u003Emmap_count 1 -\u003E 0   (no lock)      (holds event-\u003Emmap_mutex)                                          inc_not_zero(rb-\u003Emmap_count) fails                                          ring_buffer_attach(event, NULL)                                          rb_alloc() \u002B attach new rb                                          refcount_set(\u0026event-\u003Emmap_count, 1)   lock; event-\u003Emmap_count 1 -\u003E 0   ring_buffer_attach(event, NULL)   ring_buffer_put() -\u003E frees the *new* rb  The revival\u0027s refcount_set(\u0026event-\u003Emmap_count, 1) is an invisible 1 -\u003E 1 write: the close frees the just-revived buffer although the other process still has it mapped -- a page-level use-after-free allowing local privilege escalation to root by any unprivileged user (default kernel.perf_event_paranoid=2).  Swap the order of the two counter updates: event-\u003Emmap_count is dropped first via refcount_dec_and_mutex_lock(), so its 1 -\u003E 0 transition and the ring_buffer_attach() stay serialized with perf_mmap(). rb-\u003Emmap_count == 0 then implies every event using the buffer is detached already, so the result of the rb-\u003Emmap_count drop can gate the remaining teardown directly and detach_rest is no longer needed.  An earlier fix for this race from Kyle Zeng and David Lee takes event-\u003Emmap_mutex around both counter updates [0]; here the not-last close stays lockless.",
  "published": "2026-09-16T00:00:00Z",
  "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": 0.00184,
  "epssPercentile": 0.08044,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
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