CVE-2023-53996 (GCVE-0-2023-53996)
Vulnerability from cvelistv5
Published
2025-12-24 10:55
Modified
2025-12-24 10:55
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: x86/sev: Make enc_dec_hypercall() accept a size instead of npages enc_dec_hypercall() accepted a page count instead of a size, which forced its callers to round up. As a result, non-page aligned vaddrs caused pages to be spuriously marked as decrypted via the encryption status hypercall, which in turn caused consistent corruption of pages during live migration. Live migration requires accurate encryption status information to avoid migrating pages from the wrong perspective.
References
Impacted products
Vendor Product Version
Linux Linux Version: 064ce6c550a0630789978bfec7a13ab2bd1bdcdf
Version: 064ce6c550a0630789978bfec7a13ab2bd1bdcdf
Version: 064ce6c550a0630789978bfec7a13ab2bd1bdcdf
Version: 064ce6c550a0630789978bfec7a13ab2bd1bdcdf
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{
  "containers": {
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          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/x86/include/asm/mem_encrypt.h",
            "arch/x86/kernel/kvm.c",
            "arch/x86/mm/mem_encrypt_amd.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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            "arch/x86/kernel/kvm.c",
            "arch/x86/mm/mem_encrypt_amd.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.16"
            },
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              "status": "unaffected",
              "version": "0",
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      "cpeApplicability": [
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          "nodes": [
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              ],
              "negate": false,
              "operator": "OR"
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          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nx86/sev: Make enc_dec_hypercall() accept a size instead of npages\n\nenc_dec_hypercall() accepted a page count instead of a size, which\nforced its callers to round up. As a result, non-page aligned\nvaddrs caused pages to be spuriously marked as decrypted via the\nencryption status hypercall, which in turn caused consistent\ncorruption of pages during live migration. Live migration requires\naccurate encryption status information to avoid migrating pages\nfrom the wrong perspective."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-12-24T10:55:33.402Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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        {
          "url": "https://git.kernel.org/stable/c/ac3f9c9f1b37edaa7d1a9b908bc79d843955a1a2"
        }
      ],
      "title": "x86/sev: Make enc_dec_hypercall() accept a size instead of npages",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2023-53996",
    "datePublished": "2025-12-24T10:55:33.402Z",
    "dateReserved": "2025-12-24T10:53:46.176Z",
    "dateUpdated": "2025-12-24T10:55:33.402Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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