{
  "cveId": "CVE-2026-23380",
  "url": "https://patchblox.com/security/cve/CVE-2026-23380",
  "summary": "CVE-2026-23380 is fixed in 90 products on 1 platform, first by DEBIAN-CVE-2026-23380, released March 25, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  tracing: Fix WARN_ON in tracing_buffers_mmap_clo...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  tracing: Fix WARN_ON in tracing_buffers_mmap_close  When a process forks, the child process copies the parent\u0027s VMAs but the user_mapped reference count is not incremented. As a result, when both the parent and child processes exit, tracing_buffers_mmap_close() is called twice. On the second call, user_mapped is already 0, causing the function to return -ENODEV and triggering a WARN_ON.  Normally, this isn\u0027t an issue as the memory is mapped with VM_DONTCOPY set. But this is only a hint, and the application can call madvise(MADVISE_DOFORK) which resets the VM_DONTCOPY flag. When the application does that, it can trigger this issue on fork.  Fix it by incrementing the user_mapped reference count without re-mapping the pages in the VMA\u0027s open callback.",
  "published": "2026-03-25T11:16:38Z",
  "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": 0.00118,
  "epssPercentile": 0.01732,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
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