{
  "cveId": "CVE-2026-99235",
  "url": "https://patchblox.com/security/cve/CVE-2026-99235",
  "summary": "CVE-2026-99235 is fixed in linux on 1 platform, first by DEBIAN-CVE-2026-99235, released November 3, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "tracing: Save the event file instead of the compatible histogram",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  tracing: Save the event file instead of the compatible histogram  create_field_var_hist() creates a histogram on the matched event to supply a field variable, and records it on the target so it can be torn down later:  \thist_data = find_compatible_hist(target_hist_data, file); \t... \t/* Save the compatible histogram information */ \tvar_hist-\u003Ehist_data = hist_data;  hist_data is not the histogram it creates. It is one that was already there, whose keys the new one copies. The saved pointer has a single user, unregister_field_var_hists(), which runs when the target is removed:  \tfile = hist_data-\u003Efield_var_hists[i]-\u003Ehist_data-\u003Eevent_file;  find_compatible_hist() matches on keys alone, so it can pick one with no variables of its own. check_var_refs() then returns false and the user can remove it while the target still points at it:   BUG: KASAN: slab-use-after-free in event_hist_trigger_free\u002B0x2b2/0x320  Read of size 8 at addr ffff8880093b90e0 by task init/1   Freed by task 1:   kfree\u002B0x154/0x420   event_hist_trigger_free\u002B0x1d5/0x320   event_hist_trigger_parse\u002B0x35f3/0x69e0   trigger_process_regex\u002B0x1a6/0x250  Save the event file instead. It is all the dereference ever wanted, and it does not go away when the user removes a trigger.",
  "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": 0.00122,
  "epssPercentile": 0.02016,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-99235",
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "6.12.115-1",
      "fix": "DEBIAN-CVE-2026-99235",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-99235",
      "released": "2026-11-03T18:58:21Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "7.2.14-1",
      "fix": "DEBIAN-CVE-2026-99235",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-99235",
      "released": "2026-11-03T18:58:21Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-09T01:18:40Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}