ghsa-v8pp-m355-r6cw
Vulnerability from github
Published
2025-05-29 15:31
Modified
2025-05-29 15:31
Details

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

KVM: arm64: Fix uninitialized memcache pointer in user_mem_abort()

Commit fce886a60207 ("KVM: arm64: Plumb the pKVM MMU in KVM") made the initialization of the local memcache variable in user_mem_abort() conditional, leaving a codepath where it is used uninitialized via kvm_pgtable_stage2_map().

This can fail on any path that requires a stage-2 allocation without transition via a permission fault or dirty logging.

Fix this by making sure that memcache is always valid.

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{
  "affected": [],
  "aliases": [
    "CVE-2025-37996"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-05-29T14:15:36Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: arm64: Fix uninitialized memcache pointer in user_mem_abort()\n\nCommit fce886a60207 (\"KVM: arm64: Plumb the pKVM MMU in KVM\") made the\ninitialization of the local memcache variable in user_mem_abort()\nconditional, leaving a codepath where it is used uninitialized via\nkvm_pgtable_stage2_map().\n\nThis can fail on any path that requires a stage-2 allocation\nwithout transition via a permission fault or dirty logging.\n\nFix this by making sure that memcache is always valid.",
  "id": "GHSA-v8pp-m355-r6cw",
  "modified": "2025-05-29T15:31:09Z",
  "published": "2025-05-29T15:31:09Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-37996"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/157dbc4a321f5bb6f8b6c724d12ba720a90f1a7c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a26d50f8a4a5049e956984797b5d0dedea4bbb18"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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