{
  "cveId": "CVE-2026-98033",
  "url": "https://patchblox.com/security/cve/CVE-2026-98033",
  "summary": "CVE-2026-98033 is fixed in linux on 1 platform, first by DEBIAN-CVE-2026-98033, released October 2, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "bpf: Preserve inner map identity in callback frames",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  bpf: Preserve inner map identity in callback frames  Callback frame constructors initialize map-typed argument registers with __mark_reg_known_zero() and then restore map_ptr. This clears map_uid, which is the only field distinguishing inner maps that share an inner_map_meta template.  When a timer callback invokes bpf_for_each_map_elem() on a second inner map, both the saved first map and the second map value can reach the nested callback as the same template with map_uid zero. bpf_timer_init() then accepts pairing the timer from the second map with the first map.  The runtime records the first map in the timer without taking a reference. Freeing that map does not find the timer stored in the second map, so a later timer callback dereferences the freed map.  Copy map_uid from the same caller register as map_ptr when constructing for-each, timer/workqueue, and task-work callback arguments. The existing identity check can then reject mismatched inner maps while allowing a callback value to be paired with its actual map.",
  "published": "2026-09-25T11:17:32Z",
  "severity": "Important",
  "cvss": 7.8,
  "epss": 0.002,
  "epssPercentile": 0.09971,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-98033",
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "6.12.115-2",
      "fix": "DEBIAN-CVE-2026-98033",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-98033",
      "released": "2026-10-02T21:04:56Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "7.2.7-1",
      "fix": "DEBIAN-CVE-2026-98033",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-98033",
      "released": "2026-10-02T21:04:56Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T13:06:02Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}