{
  "cveId": "CVE-2026-90066",
  "url": "https://patchblox.com/security/cve/CVE-2026-90066",
  "summary": "CVE-2026-90066 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2026-90066, released September 23, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "samples/ftrace: Fix kthread_stop() on ERR_PTR in ftrace-direct-multi-modify",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  samples/ftrace: Fix kthread_stop() on ERR_PTR in ftrace-direct-multi-modify  ftrace_direct_multi_init() assigns kthread_run()\u0027s return value to simple_tsk without an IS_ERR() check. When kthread_run() fails it returns ERR_PTR(-ENOMEM), but init still returns 0, so the module loads with simple_tsk holding an error pointer. On unload, ftrace_direct_multi_exit() then passes that ERR_PTR to kthread_stop(), leading to a null-pointer-dereference.  Check the return value of kthread_run() with IS_ERR(); on failure, unregister the ftrace direct call and propagate the error code.",
  "published": "2026-09-17T17:16:55Z",
  "severity": "Moderate",
  "cvss": 5.5,
  "epss": 0.00206,
  "epssPercentile": 0.10667,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-90066",
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "6.12.111-1",
      "fix": "DEBIAN-CVE-2026-90066",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-90066",
      "released": "2026-09-23T19:19:02Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "7.2.6-1",
      "fix": "DEBIAN-CVE-2026-90066",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-90066",
      "released": "2026-09-23T19:19:02Z"
    },
    {
      "platform": "linux",
      "product": "linux-6.12",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "6.12.111-1~deb12u1",
      "fix": "DEBIAN-CVE-2026-90066",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-90066",
      "released": "2026-09-23T19:19:02Z"
    }
  ],
  "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"
  }
}