{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "1a8c64e110435e44e71bcd50a75663174b575f22"
            },
            {
              "fixed": "802e113cf120df7208e4c7e604950a85e87120a8"
            },
            {
              "fixed": "22dc0d042f02ce82aa61422ea5f232628bfd9e9c"
            },
            {
              "fixed": "6c25bf4e44a2b6a14332f952bba0974521f5b72d"
            },
            {
              "fixed": "bc3dd82a0ffd488bb902f4c69c3d28fd4088d973"
            },
            {
              "fixed": "059ac6252a63edf1cea79bf30bd860a8c264b62c"
            },
            {
              "fixed": "a2b8d7827f48ee54a686cb80e4a1d0ff954ec42a"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.6.0"
            },
            {
              "fixed": "6.6.144"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.95"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.37"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.0.14"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "7.1.0"
            },
            {
              "fixed": "7.1.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64244.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrivers/base/memory: set mem-\u003ealtmap after successful device registration\n\nIf __add_memory_block() fails at xa_store() (under memory pressure for\nexample), device_unregister() is called, which eventually triggers\nmemory_block_release() with mem-\u003ealtmap still set, causing a\nWARN_ON(mem-\u003ealtmap).  This was triggered by modifying virtio-mem driver.\n\nFix this by delaying the assignment of mem-\u003ealtmap until after\n__add_memory_block() has succeeded.",
  "id": "CVE-2026-64244",
  "modified": "2026-08-19T03:31:22.501847572Z",
  "published": "2026-07-24T15:29:59.891Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/059ac6252a63edf1cea79bf30bd860a8c264b62c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/22dc0d042f02ce82aa61422ea5f232628bfd9e9c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6c25bf4e44a2b6a14332f952bba0974521f5b72d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/802e113cf120df7208e4c7e604950a85e87120a8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a2b8d7827f48ee54a686cb80e4a1d0ff954ec42a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bc3dd82a0ffd488bb902f4c69c3d28fd4088d973"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64244.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64244"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "drivers/base/memory: set mem-\u003ealtmap after successful device registration"
}