GHSA-837V-FG39-RFWW

Vulnerability from github – Published: 2026-07-24 18:31 – Updated: 2026-07-24 18:31
VLAI
Details

In the Linux kernel, the following vulnerability has been resolved:

drivers/base/memory: set mem->altmap after successful device registration

If __add_memory_block() fails at xa_store() (under memory pressure for example), device_unregister() is called, which eventually triggers memory_block_release() with mem->altmap still set, causing a WARN_ON(mem->altmap). This was triggered by modifying virtio-mem driver.

Fix this by delaying the assignment of mem->altmap until after __add_memory_block() has succeeded.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-64244"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-24T16:16:53Z",
    "severity": null
  },
  "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": "GHSA-837v-fg39-rfww",
  "modified": "2026-07-24T18:31:28Z",
  "published": "2026-07-24T18:31:28Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64244"
    },
    {
      "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"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}



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