{
  "cveId": "CVE-2026-93216",
  "url": "https://patchblox.com/security/cve/CVE-2026-93216",
  "summary": "CVE-2026-93216 is fixed in linux on 1 platform, first by DEBIAN-CVE-2026-93216, released September 24, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "mm/page_owner: use memcg_data snapshot to avoid TOCTOU in print_page_owner_memcg()",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  mm/page_owner: use memcg_data snapshot to avoid TOCTOU in print_page_owner_memcg()  print_page_owner_memcg() reads page-\u003Ememcg_data via READ_ONCE() at the start to guard against tail pages and NULL data.  However, it later re-reads page-\u003Ememcg_data locklessly in two places:  1: page_memcg_check(page)  2: PageMemcgKmem(page) (via folio_memcg_kmem(), which includes    VM_BUG_ON assertions for tail pages and MEMCG_DATA_OBJEXTS)  If the page is concurrently freed and reallocated as a THP tail page or slab page between these calls, the VM_BUG_ON assertions can trigger on CONFIG_DEBUG_VM=y builds, crashing the kernel.  Fix both TOCTOU issues by using the memcg_data snapshot throughout.",
  "published": "2026-09-24T16:17:16Z",
  "severity": "Moderate",
  "cvss": 4.1,
  "epss": 0.00168,
  "epssPercentile": 0.06222,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-93216",
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "6.12.115-2",
      "fix": "DEBIAN-CVE-2026-93216",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-93216",
      "released": "2026-09-24T19:30:44Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "7.2.6-1",
      "fix": "DEBIAN-CVE-2026-93216",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-93216",
      "released": "2026-09-24T19:30:44Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-09T07:25:28Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}