CVE-2025-37996 (GCVE-0-2025-37996)
Vulnerability from cvelistv5
Published
2025-05-29 13:15
Modified
2025-05-29 13:15
Severity ?
Summary
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: fce886a6020734d6253c2c5a3bc285e385cc5496
Version: fce886a6020734d6253c2c5a3bc285e385cc5496
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{
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/arm64/kvm/mmu.c"
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      "cpeApplicability": [
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                  "versionStartIncluding": "6.14",
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          "lang": "en",
          "value": "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-05-29T13:15:54.956Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/a26d50f8a4a5049e956984797b5d0dedea4bbb18"
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        {
          "url": "https://git.kernel.org/stable/c/157dbc4a321f5bb6f8b6c724d12ba720a90f1a7c"
        }
      ],
      "title": "KVM: arm64: Fix uninitialized memcache pointer in user_mem_abort()",
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  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-37996",
    "datePublished": "2025-05-29T13:15:54.956Z",
    "dateReserved": "2025-04-16T04:51:23.976Z",
    "dateUpdated": "2025-05-29T13:15:54.956Z",
    "state": "PUBLISHED"
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  }
}


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