{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2024-35995",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2024-35995"
  ],
  "published": "2024-05-20T09:48:48Z",
  "summary": "ACPI: CPPC: Use access_width over bit_width for system memory accesses",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nACPI: CPPC: Use access_width over bit_width for system memory accesses\n\nTo align with ACPI 6.3+, since bit_width can be any 8-bit value, it\ncannot be depended on to be always on a clean 8b boundary. This was\nuncovered on the Cobalt 100 platform.\n\nSError Interrupt on CPU26, code 0xbe000011 -- SError\n CPU: 26 PID: 1510 Comm: systemd-udevd Not tainted 5.15.2.1-13 #1\n Hardware name: MICROSOFT CORPORATION, BIOS MICROSOFT CORPORATION\n pstate: 62400009 (nZCv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=--)\n pc : cppc_get_perf_caps+0xec/0x410\n lr : cppc_get_perf_caps+0xe8/0x410\n sp : ffff8000155ab730\n x29: ffff8000155ab730 x28: ffff0080139d0038 x27: ffff0080139d0078\n x26: 0000000000000000 x25: ffff0080139d0058 x24: 00000000ffffffff\n x23: ffff0080139d0298 x22: ffff0080139d0278 x21: 0000000000000000\n x20: ffff00802b251910 x19: ffff0080139d0000 x18: ffffffffffffffff\n x17: 0000000000000000 x16: ffffdc7e111bad04 x15: ffff00802b251008\n x14: ffffffffffffffff x13: ffff013f1fd63300 x12: 0000000000000006\n x11: ffffdc7e128f4420 x10: 0000000000000000 x9 : ffffdc7e111badec\n x8 : ffff00802b251980 x7 : 0000000000000000 x6 : ffff0080139d0028\n x5 : 0000000000000000 x4 : ffff0080139d0018 x3 : 00000000ffffffff\n x2 : 0000000000000008 x1 : ffff8000155ab7a0 x0 : 0000000000000000\n Kernel panic - not syncing: Asynchronous SError Interrupt\n CPU: 26 PID: 1510 Comm: systemd-udevd Not tainted\n5.15.2.1-13 #1\n Hardware name: MICROSOFT CORPORATION, BIOS MICROSOFT CORPORATION\n Call trace:\n  dump_backtrace+0x0/0x1e0\n  show_stack+0x24/0x30\n  dump_stack_lvl+0x8c/0xb8\n  dump_stack+0x18/0x34\n  panic+0x16c/0x384\n  add_taint+0x0/0xc0\n  arm64_serror_panic+0x7c/0x90\n  arm64_is_fatal_ras_serror+0x34/0xa4\n  do_serror+0x50/0x6c\n  el1h_64_error_handler+0x40/0x74\n  el1h_64_error+0x7c/0x80\n  cppc_get_perf_caps+0xec/0x410\n  cppc_cpufreq_cpu_init+0x74/0x400 [cppc_cpufreq]\n  cpufreq_online+0x2dc/0xa30\n  cpufreq_add_dev+0xc0/0xd4\n  subsys_interface_register+0x134/0x14c\n  cpufreq_register_driver+0x1b0/0x354\n  cppc_cpufreq_init+0x1a8/0x1000 [cppc_cpufreq]\n  do_one_initcall+0x50/0x250\n  do_init_module+0x60/0x27c\n  load_module+0x2300/0x2570\n  __do_sys_finit_module+0xa8/0x114\n  __arm64_sys_finit_module+0x2c/0x3c\n  invoke_syscall+0x78/0x100\n  el0_svc_common.constprop.0+0x180/0x1a0\n  do_el0_svc+0x84/0xa0\n  el0_svc+0x2c/0xc0\n  el0t_64_sync_handler+0xa4/0x12c\n  el0t_64_sync+0x1a4/0x1a8\n\nInstead, use access_width to determine the size and use the offset and\nwidth to shift and mask the bits to read/write out. Make sure to add a\ncheck for system memory since pcc redefines the access_width to\nsubspace id.\n\nIf access_width is not set, then fall back to using bit_width.\n\n[ rjw: Subject and changelog edits, comment adjustments ]",
  "affected": [
    {
      "package": {
        "ecosystem": "Raspberry Pi OS:12",
        "name": "linux"
      },
      "versions": [
        "1:6.1.47-1+rpt4"
      ],
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-2712",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v6",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7l",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v8",
            "binary_version": "1:6.1.47-1+rpt4"
          }
        ]
      },
      "database_specific": {
        "per_version": {
          "1:6.1.47-1+rpt4": {
            "linux_commit": "655fc658a15ae7a6f37103754adb39ba52a9a14e",
            "upstream_version": "6.1.47",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.1.90",
            "compiled_filter": false
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2024-35995"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/01fc53be672acae37e611c80cc0b4f3939584de3"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/1b890ae474d19800a6be1696df7fb4d9a41676e4"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/6cb6b12b78dcd8867a3fdbb1b6d0ed1df2b208d1"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/2f4a4d63a193be6fd530d180bb13c3592052904c"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-05-12T04:54:46Z"
  }
}