{
  "cveId": "CVE-2026-23012",
  "url": "https://patchblox.com/security/cve/CVE-2026-23012",
  "summary": "CVE-2026-23012 is fixed in linux on 1 platform by DEBIAN-CVE-2026-23012 (version 6.18.8-1), released January 25, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  mm/damon/core: remove call_control in inactive c...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  mm/damon/core: remove call_control in inactive contexts  If damon_call() is executed against a DAMON context that is not running, the function returns error while keeping the damon_call_control object linked to the context\u0027s call_controls list.  Let\u0027s suppose the object is deallocated after the damon_call(), and yet another damon_call() is executed against the same context.  The function tries to add the new damon_call_control object to the call_controls list, which still has the pointer to the previous damon_call_control object, which is deallocated.  As a result, use-after-free happens.  This can actually be triggered using the DAMON sysfs interface.  It is not easily exploitable since it requires the sysfs write permission and making a definitely weird file writes, though.  Please refer to the report for more details about the issue reproduction steps.  Fix the issue by making two changes.  Firstly, move the final kdamond_call() for cancelling all existing damon_call() requests from terminating DAMON context to be done before the ctx-\u003Ekdamond reset.  This makes any code that sees NULL ctx-\u003Ekdamond can safely assume the context may not access damon_call() requests anymore.  Secondly, let damon_call() to cleanup the damon_call_control objects that were added to the already-terminated DAMON context, before returning the error.",
  "published": "2026-01-25T15:15:56Z",
  "severity": "high",
  "cvss": 7.8,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
  "epss": 0.00177,
  "epssPercentile": 0.07315,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "6.18.8-1",
      "fix": "DEBIAN-CVE-2026-23012",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-23012",
      "released": "2026-01-25T15:15:56Z"
    }
  ],
  "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"
  }
}