{
  "cveId": "CVE-2026-99233",
  "url": "https://patchblox.com/security/cve/CVE-2026-99233",
  "summary": "CVE-2026-99233 is fixed in linux on 1 platform by DEBIAN-CVE-2026-99233 (version 6.12.115-1), released November 3, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "tracing/histograms: Verify event_call identity when updating synth_event refcount",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  tracing/histograms: Verify event_call identity when updating synth_event refcount  In event_hist_trigger_parse() and hist_unreg_all(), the histogram registration and unregistration paths look up find_synth_event() using trace_event_name(file-\u003Eevent_call) and adjust se-\u003Eref if a match is found.  Because find_synth_event() only compares the event basename, registering or removing a histogram on a non-synthetic trace event whose basename matches a synthetic event erroneously modifies the synthetic event\u0027s reference count.  If a histogram is registered on the non-synthetic event before the synthetic event is created and removed afterwards, se-\u003Eref is decremented without a matching increment, allowing the synthetic event to be freed while an active histogram action still holds a pointer to it.  Introduce find_synth_event_call() to verify that \u0026se-\u003Ecall matches file-\u003Eevent_call before adjusting se-\u003Eref.",
  "published": "2026-11-02T16:17:48Z",
  "severity": "Moderate",
  "cvss": 7.8,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
  "epss": 0.00121,
  "epssPercentile": 0.01889,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-99233",
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "6.12.115-1",
      "fix": "DEBIAN-CVE-2026-99233",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-99233",
      "released": "2026-11-03T18:58:21Z"
    }
  ],
  "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"
  }
}