ghsa-64pc-rqj8-96w6
Vulnerability from github
Published
2025-09-16 15:32
Modified
2025-09-16 15:32
Details

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

efi: stmm: Fix incorrect buffer allocation method

The communication buffer allocated by setup_mm_hdr() is later on passed to tee_shm_register_kernel_buf(). The latter expects those buffers to be contiguous pages, but setup_mm_hdr() just uses kmalloc(). That can cause various corruptions or BUGs, specifically since commit 9aec2fb0fd5e ("slab: allocate frozen pages"), though it was broken before as well.

Fix this by using alloc_pages_exact() instead of kmalloc().

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{
  "affected": [],
  "aliases": [
    "CVE-2025-39836"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-09-16T14:15:51Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nefi: stmm: Fix incorrect buffer allocation method\n\nThe communication buffer allocated by setup_mm_hdr() is later on passed\nto tee_shm_register_kernel_buf(). The latter expects those buffers to be\ncontiguous pages, but setup_mm_hdr() just uses kmalloc(). That can cause\nvarious corruptions or BUGs, specifically since commit 9aec2fb0fd5e\n(\"slab: allocate frozen pages\"), though it was broken before as well.\n\nFix this by using alloc_pages_exact() instead of kmalloc().",
  "id": "GHSA-64pc-rqj8-96w6",
  "modified": "2025-09-16T15:32:36Z",
  "published": "2025-09-16T15:32:36Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-39836"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/630c0e6064daf84f17aad1a7d9ca76b562e3fe47"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/77ff27ff0e4529a003c8a1c2492c111968c378d3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c5e81e672699e0c5557b2b755cc8f7a69aa92bff"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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