CVE-2024-35995 (GCVE-0-2024-35995)

Vulnerability from cvelistv5 – Published: 2024-05-20 09:47 – Updated: 2026-05-11 20:15
VLAI
Title
ACPI: CPPC: Use access_width over bit_width for system memory accesses
Summary
In the Linux kernel, the following vulnerability has been resolved: ACPI: CPPC: Use access_width over bit_width for system memory accesses To align with ACPI 6.3+, since bit_width can be any 8-bit value, it cannot be depended on to be always on a clean 8b boundary. This was uncovered on the Cobalt 100 platform. SError Interrupt on CPU26, code 0xbe000011 -- SError CPU: 26 PID: 1510 Comm: systemd-udevd Not tainted 5.15.2.1-13 #1 Hardware name: MICROSOFT CORPORATION, BIOS MICROSOFT CORPORATION pstate: 62400009 (nZCv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=--) pc : cppc_get_perf_caps+0xec/0x410 lr : cppc_get_perf_caps+0xe8/0x410 sp : ffff8000155ab730 x29: ffff8000155ab730 x28: ffff0080139d0038 x27: ffff0080139d0078 x26: 0000000000000000 x25: ffff0080139d0058 x24: 00000000ffffffff x23: ffff0080139d0298 x22: ffff0080139d0278 x21: 0000000000000000 x20: ffff00802b251910 x19: ffff0080139d0000 x18: ffffffffffffffff x17: 0000000000000000 x16: ffffdc7e111bad04 x15: ffff00802b251008 x14: ffffffffffffffff x13: ffff013f1fd63300 x12: 0000000000000006 x11: ffffdc7e128f4420 x10: 0000000000000000 x9 : ffffdc7e111badec x8 : ffff00802b251980 x7 : 0000000000000000 x6 : ffff0080139d0028 x5 : 0000000000000000 x4 : ffff0080139d0018 x3 : 00000000ffffffff x2 : 0000000000000008 x1 : ffff8000155ab7a0 x0 : 0000000000000000 Kernel panic - not syncing: Asynchronous SError Interrupt CPU: 26 PID: 1510 Comm: systemd-udevd Not tainted 5.15.2.1-13 #1 Hardware name: MICROSOFT CORPORATION, BIOS MICROSOFT CORPORATION Call trace: dump_backtrace+0x0/0x1e0 show_stack+0x24/0x30 dump_stack_lvl+0x8c/0xb8 dump_stack+0x18/0x34 panic+0x16c/0x384 add_taint+0x0/0xc0 arm64_serror_panic+0x7c/0x90 arm64_is_fatal_ras_serror+0x34/0xa4 do_serror+0x50/0x6c el1h_64_error_handler+0x40/0x74 el1h_64_error+0x7c/0x80 cppc_get_perf_caps+0xec/0x410 cppc_cpufreq_cpu_init+0x74/0x400 [cppc_cpufreq] cpufreq_online+0x2dc/0xa30 cpufreq_add_dev+0xc0/0xd4 subsys_interface_register+0x134/0x14c cpufreq_register_driver+0x1b0/0x354 cppc_cpufreq_init+0x1a8/0x1000 [cppc_cpufreq] do_one_initcall+0x50/0x250 do_init_module+0x60/0x27c load_module+0x2300/0x2570 __do_sys_finit_module+0xa8/0x114 __arm64_sys_finit_module+0x2c/0x3c invoke_syscall+0x78/0x100 el0_svc_common.constprop.0+0x180/0x1a0 do_el0_svc+0x84/0xa0 el0_svc+0x2c/0xc0 el0t_64_sync_handler+0xa4/0x12c el0t_64_sync+0x1a4/0x1a8 Instead, use access_width to determine the size and use the offset and width to shift and mask the bits to read/write out. Make sure to add a check for system memory since pcc redefines the access_width to subspace id. If access_width is not set, then fall back to using bit_width. [ rjw: Subject and changelog edits, comment adjustments ]
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-05-21 15:11 UTC
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7033 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 5bbb86aa4b8d84395e42cd05448820651d79f349 , < 01fc53be672acae37e611c80cc0b4f3939584de3 (git)
Affected: 5bbb86aa4b8d84395e42cd05448820651d79f349 , < 1b890ae474d19800a6be1696df7fb4d9a41676e4 (git)
Affected: 5bbb86aa4b8d84395e42cd05448820651d79f349 , < 6cb6b12b78dcd8867a3fdbb1b6d0ed1df2b208d1 (git)
Affected: 5bbb86aa4b8d84395e42cd05448820651d79f349 , < 2f4a4d63a193be6fd530d180bb13c3592052904c (git)
guessed Create a notification for this product.
Linux Linux Affected: 4.9
Unaffected: 0 , < 4.9 (semver)
Unaffected: 6.1.90 , ≤ 6.1.* (semver)
Unaffected: 6.6.30 , ≤ 6.6.* (semver)
Unaffected: 6.8.9 , ≤ 6.8.* (semver)
Unaffected: 6.9 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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            "value": "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 ]"
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ACPI: CPPC: use access_width sobre bit_width para accesos a la memoria del sistema. Para alinearse con ACPI 6.3+, dado que bit_width puede ser cualquier valor de 8 bits, no se puede depender de que est\u00e9 siempre encendido. un l\u00edmite limpio de 8b. Esto fue descubierto en la plataforma Cobalt 100. Interrupci\u00f3n de error en CPU26, c\u00f3digo 0xbe000011 - CPU de SError: 26 PID: 1510 Comm: systemd-udevd Not tainted 5.15.2.1-13 #1 Nombre de hardware: MICROSOFT CORPORATION, BIOS MICROSOFT CORPORATION pstate: 62400009 (nZCv daif +PAN -UAO + TCO -DIT -SSBS BTYPE=--) pc: cppc_get_perf_caps+0xec/0x410 lr: cppc_get_perf_caps+0xe8/0x410 sp: ffff8000155ab730 x29: ffff8000155ab730 x28: ffff0080139d0038 x27: 0080139d0078 x26: 0000000000000000 x25: ffff0080139d0058 x24: 00000000ffffffff x23: ffff0080139d0298 x22: ffff0080139d0278 x21: 0000000000000000 x20: ffff00802b251910 x19: ffff0080139d0000 x18: ffffffffffffffff x17: 0000000000000000 x16: d04 x15: ffff00802b251008 x14: ffffffffffffffff x13: ffff013f1fd63300 x12: 0000000000000006 x11: ffffdc7e128f4420 x10: 0000000000000000 x9: ffffdc7 e111badec x8: ffff00802b251980 x7: 0000000000000000 x6: ffff0080139d0028 x5 : 0000000000000000 x4 : ffff0080139d0018 x3 : 00000000ffffffff x2 : 0000000000000008 x1 : ffff8000155ab7a0 x0 : 0000000000000000 P\u00e1nico del kernel - no se sincroniza: SError as\u00edncrono Interrupci\u00f3n CPU: 26 PID: 1510 Comunicaci\u00f3n: systemd-udevd No contaminado 5.15.2.1-13 #1 Nombre de hardware: MICROSOFT CORPORATION, BIOS MICROSOFT CORPORATION Rastreo de llamadas: dump_backtrace+0x0/0x1e0 show_stack+0x24/0x30 dump_stack_lvl+0x8c/0xb8 dump_stack+0x18/0x34 panic+0x16c/0x384 add_taint+0x0/0xc0 arm64_serror_panic+0x7c/0x9 0 arm64_is_fatal_ras_serror+0x34/0xa4 do_serror+ 0x50/0x6c el1h_64_error_handler+0x40/0x74 el1h_64_error+0x7c/0x80 cppc_get_perf_caps+0xec/0x410 cppc_cpufreq_cpu_init+0x74/0x400 [cppc_cpufreq] cpufreq_add_dev+0xc0/0xd4 subsys_interface_register+0x134/0x14c cpufreq_register_driver+0x1b0/0x354 cppc_cpufreq_init+0x1a8/ 0x1000 [cppc_cpufreq] do_one_initcall+0x50/0x250 do_init_module+0x60/0x27c load_module+0x2300/0x2570 __do_sys_finit_module+0xa8/0x114 __arm64_sys_finit_module+0x2c/0x3c invoke_ llamada al sistema+0x78/0x100 el0_svc_common.constprop.0+0x180/0x1a0 do_el0_svc+0x84/0xa0 el0_svc+ 0x2c/0xc0 el0t_64_sync_handler+0xa4/0x12c el0t_64_sync+0x1a4/0x1a8 En su lugar, use access_width para determinar el tama\u00f1o y use el desplazamiento y el ancho para desplazar y enmascarar los bits para leer/escribir. Aseg\u00farese de agregar una verificaci\u00f3n de la memoria del sistema, ya que pcc redefine el ancho de acceso al ID del subespacio. Si access_width no est\u00e1 configurado, vuelva a utilizar bit_width. [rjw: ediciones de asunto y registro de cambios, ajustes de comentarios]"
          }
        ],
        "id": "CVE-2024-35995",
        "lastModified": "2026-06-17T07:35:54.393",
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                "privilegesRequired": "LOW",
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Analyzed",
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      "product_status:fixed": "280",
      "product_status:known_affected": "98",
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    },
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            "title": "CVE Program Container"
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            "metrics": [
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            "title": "CISA ADP Vulnrichment"
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        "cna": {
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              "defaultStatus": "unaffected",
              "product": "Linux",
              "programFiles": [
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                  "versionType": "semver"
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                  "lessThanOrEqual": "6.8.*",
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                  "version": "6.8.9",
                  "versionType": "semver"
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                {
                  "lessThanOrEqual": "*",
                  "status": "unaffected",
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                  "versionType": "original_commit_for_fix"
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            }
          ],
          "cpeApplicability": [
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              "nodes": [
                {
                  "cpeMatch": [
                    {
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                      "versionEndExcluding": "6.1.90",
                      "versionStartIncluding": "4.9",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.6.30",
                      "versionStartIncluding": "4.9",
                      "vulnerable": true
                    },
                    {
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                      "vulnerable": true
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                    {
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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\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 ]"
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-05-11T20:15:16.281Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/01fc53be672acae37e611c80cc0b4f3939584de3"
            },
            {
              "url": "https://git.kernel.org/stable/c/1b890ae474d19800a6be1696df7fb4d9a41676e4"
            },
            {
              "url": "https://git.kernel.org/stable/c/6cb6b12b78dcd8867a3fdbb1b6d0ed1df2b208d1"
            },
            {
              "url": "https://git.kernel.org/stable/c/2f4a4d63a193be6fd530d180bb13c3592052904c"
            }
          ],
          "title": "ACPI: CPPC: Use access_width over bit_width for system memory accesses",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2024-35995",
        "datePublished": "2024-05-20T09:47:59.057Z",
        "dateReserved": "2024-05-17T13:50:33.148Z",
        "dateUpdated": "2026-05-11T20:15:16.281Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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