{
  "cveId": "CVE-2026-99247",
  "url": "https://patchblox.com/security/cve/CVE-2026-99247",
  "summary": "CVE-2026-99247 is fixed in linux on 1 platform, first by DEBIAN-CVE-2026-99247, released November 3, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "tracing: Do not initialize tracefs work if tracing is disabled",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  tracing: Do not initialize tracefs work if tracing is disabled  If trace buffer allocation fails during early boot (e.g.  in early_trace_init() -\u003E allocate_trace_buffers()), tracing_disabled is left set to 1 and the global trace array events list remains uninitialized.  Later during boot, tracer_init_tracefs() (invoked via fs_initcall) queues tracerfs_init_work asynchronously without checking if tracing was disabled.  When tracer_init_tracefs_work_func() runs, it calls event_trace_init() and init_tracer_tracefs(\u0026global_trace, NULL) unconditionally.  This leads to __find_event_file() dereferencing an uninitialized tr-\u003Eevents list, causing an early boot NULL pointer dereference Oops:    BUG: Kernel NULL pointer dereference on read at 0x00000010   Faulting instruction address: 0xc000000000485be0   Oops: Kernel access of bad area, sig: 7 [#1]   ...   NIP [c000000000485be0] __find_event_file\u002B0x70/0x3c0   LR  [c000000000448874] init_tracer_tracefs\u002B0x274/0xc80   Call Trace:    init_tracer_tracefs\u002B0x274/0xc80    tracer_init_tracefs_work_func\u002B0x50/0x320    process_one_work\u002B0x1e8/0x5c0    worker_thread\u002B0x1dc/0x3d0    kthread\u002B0x194/0x1b0    start_kernel_thread\u002B0x14/0x18  Check tracing_disabled at the beginning of tracer_init_tracefs_work_func() and return immediately if tracing is disabled or failed to initialize, preventing the crash.",
  "published": "2026-11-03T12:17:31Z",
  "severity": "Moderate",
  "cvss": 4.1,
  "epss": 0.00161,
  "epssPercentile": 0.05339,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-99247",
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "6.12.115-1",
      "fix": "DEBIAN-CVE-2026-99247",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-99247",
      "released": "2026-11-03T18:58:21Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "7.2.13-1",
      "fix": "DEBIAN-CVE-2026-99247",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-99247",
      "released": "2026-11-03T18:58:21Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T06:59:42Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}