ghsa-hv7j-2x22-hrmc
Vulnerability from github
Published
2025-10-01 12:30
Modified
2025-10-01 12:30
Details

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. ]

Show details on source website

To clipboard 

{
  "affected": [],
  "aliases": [
    "CVE-2023-53474"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-10-01T12:15:49Z",
    "severity": null
  },
  "details": "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. ]",
  "id": "GHSA-hv7j-2x22-hrmc",
  "modified": "2025-10-01T12:30:29Z",
  "published": "2025-10-01T12:30:29Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-53474"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/11c58a0c1937c157dbdf82d5ab634d68c99f3098"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4c1cdec319b9aadb65737c3eb1f5cb74bd6aa156"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/67bb7521b6420d81dab7538c0686f18f7d6d09f4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9669fa17287c3af2bbd4868d4c8fdd9e57f8332e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a9b9ea0e63a0ec5e97bf1219ab6dcbd55e362f83"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ba8ffb1251eb629c2ec35220e3896cf4f7b888a7"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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