CVE-2023-53474 (GCVE-0-2023-53474)
Vulnerability from cvelistv5
Published
2025-10-01 11:42
Modified
2025-10-01 11:42
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: x86/MCE/AMD: Use an u64 for bank_map Thee maximum number of MCA banks is 64 (MAX_NR_BANKS), see a0bc32b3cacf ("x86/mce: Increase maximum number of banks to 64"). However, the bank_map which contains a bitfield of which banks to initialize is of type unsigned int and that overflows when those bit numbers are >= 32, leading to UBSAN complaining correctly: UBSAN: shift-out-of-bounds in arch/x86/kernel/cpu/mce/amd.c:1365:38 shift exponent 32 is too large for 32-bit type 'int' Change the bank_map to a u64 and use the proper BIT_ULL() macro when modifying bits in there. [ bp: Rewrite commit message. ]
References
Impacted products
Vendor Product Version
Linux Linux Version: a0bc32b3cacf194dc479b342f006203fd1e1941a
Version: a0bc32b3cacf194dc479b342f006203fd1e1941a
Version: a0bc32b3cacf194dc479b342f006203fd1e1941a
Version: a0bc32b3cacf194dc479b342f006203fd1e1941a
Version: a0bc32b3cacf194dc479b342f006203fd1e1941a
Version: a0bc32b3cacf194dc479b342f006203fd1e1941a
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{
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      ],
      "cpeApplicability": [
        {
          "nodes": [
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nx86/MCE/AMD: Use an u64 for bank_map\n\nThee maximum number of MCA banks is 64 (MAX_NR_BANKS), see\n\n  a0bc32b3cacf (\"x86/mce: Increase maximum number of banks to 64\").\n\nHowever, the bank_map which contains a bitfield of which banks to\ninitialize is of type unsigned int and that overflows when those bit\nnumbers are \u003e= 32, leading to UBSAN complaining correctly:\n\n  UBSAN: shift-out-of-bounds in arch/x86/kernel/cpu/mce/amd.c:1365:38\n  shift exponent 32 is too large for 32-bit type \u0027int\u0027\n\nChange the bank_map to a u64 and use the proper BIT_ULL() macro when\nmodifying bits in there.\n\n  [ bp: Rewrite commit message. ]"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-10-01T11:42:43.798Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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          "url": "https://git.kernel.org/stable/c/a9b9ea0e63a0ec5e97bf1219ab6dcbd55e362f83"
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        },
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          "url": "https://git.kernel.org/stable/c/67bb7521b6420d81dab7538c0686f18f7d6d09f4"
        },
        {
          "url": "https://git.kernel.org/stable/c/4c1cdec319b9aadb65737c3eb1f5cb74bd6aa156"
        }
      ],
      "title": "x86/MCE/AMD: Use an u64 for bank_map",
      "x_generator": {
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2023-53474",
    "datePublished": "2025-10-01T11:42:43.798Z",
    "dateReserved": "2025-10-01T11:39:39.401Z",
    "dateUpdated": "2025-10-01T11:42:43.798Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2023-53474\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-10-01T12:15:49.687\",\"lastModified\":\"2025-10-02T19:12:17.160\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nx86/MCE/AMD: Use an u64 for bank_map\\n\\nThee maximum number of MCA banks is 64 (MAX_NR_BANKS), see\\n\\n  a0bc32b3cacf (\\\"x86/mce: Increase maximum number of banks to 64\\\").\\n\\nHowever, the bank_map which contains a bitfield of which banks to\\ninitialize is of type unsigned int and that overflows when those bit\\nnumbers are \u003e= 32, leading to UBSAN complaining correctly:\\n\\n  UBSAN: shift-out-of-bounds in arch/x86/kernel/cpu/mce/amd.c:1365:38\\n  shift exponent 32 is too large for 32-bit type \u0027int\u0027\\n\\nChange the bank_map to a u64 and use the proper BIT_ULL() macro when\\nmodifying bits in there.\\n\\n  [ bp: Rewrite commit message. ]\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/11c58a0c1937c157dbdf82d5ab634d68c99f3098\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/4c1cdec319b9aadb65737c3eb1f5cb74bd6aa156\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/67bb7521b6420d81dab7538c0686f18f7d6d09f4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9669fa17287c3af2bbd4868d4c8fdd9e57f8332e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a9b9ea0e63a0ec5e97bf1219ab6dcbd55e362f83\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ba8ffb1251eb629c2ec35220e3896cf4f7b888a7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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