{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "fcf8935832b86d3437f00e732c6d0d4d2819d6a9"
            },
            {
              "fixed": "46761406e14381dc35f498c247a87565b87ea2ef"
            },
            {
              "fixed": "90f095b816e25c6a9e4446d299bac5007fdcb3df"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.18.0"
            },
            {
              "fixed": "7.2.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93216.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/page_owner: use memcg_data snapshot to avoid TOCTOU in print_page_owner_memcg()\n\nprint_page_owner_memcg() reads page-\u003ememcg_data via READ_ONCE() at the\nstart to guard against tail pages and NULL data.  However, it later\nre-reads page-\u003ememcg_data locklessly in two places:\n\n1: page_memcg_check(page)\n\n2: PageMemcgKmem(page) (via folio_memcg_kmem(), which includes\n   VM_BUG_ON assertions for tail pages and MEMCG_DATA_OBJEXTS)\n\nIf the page is concurrently freed and reallocated as a THP tail page or\nslab page between these calls, the VM_BUG_ON assertions can trigger on\nCONFIG_DEBUG_VM=y builds, crashing the kernel.\n\nFix both TOCTOU issues by using the memcg_data snapshot throughout.",
  "id": "CVE-2026-93216",
  "modified": "2026-09-26T03:30:53.107451601Z",
  "published": "2026-09-24T15:10:38.702Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/46761406e14381dc35f498c247a87565b87ea2ef"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/90f095b816e25c6a9e4446d299bac5007fdcb3df"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93216.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-93216"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "mm/page_owner: use memcg_data snapshot to avoid TOCTOU in print_page_owner_memcg()"
}