{
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "aliases": [
        "CVE-2024-26674"
      ],
      "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nx86/lib: Revert to _ASM_EXTABLE_UA() for {get,put}_user() fixups\n\nDuring memory error injection test on kernels \u003e= v6.4, the kernel panics\nlike below. However, this issue couldn\u0027t be reproduced on kernels \u003c= v6.3.\n\n  mce: [Hardware Error]: CPU 296: Machine Check Exception: f Bank 1: bd80000000100134\n  mce: [Hardware Error]: RIP 10:\u003cffffffff821b9776\u003e {__get_user_nocheck_4+0x6/0x20}\n  mce: [Hardware Error]: TSC 411a93533ed ADDR 346a8730040 MISC 86\n  mce: [Hardware Error]: PROCESSOR 0:a06d0 TIME 1706000767 SOCKET 1 APIC 211 microcode 80001490\n  mce: [Hardware Error]: Run the above through \u0027mcelog --ascii\u0027\n  mce: [Hardware Error]: Machine check: Data load in unrecoverable area of kernel\n  Kernel panic - not syncing: Fatal local machine check\n\nThe MCA code can recover from an in-kernel #MC if the fixup type is\nEX_TYPE_UACCESS, explicitly indicating that the kernel is attempting to\naccess userspace memory. However, if the fixup type is EX_TYPE_DEFAULT\nthe only thing that is raised for an in-kernel #MC is a panic.\n\nex_handler_uaccess() would warn if users gave a non-canonical addresses\n(with bit 63 clear) to {get, put}_user(), which was unexpected.\n\nTherefore, commit\n\n  b19b74bc99b1 (\"x86/mm: Rework address range check in get_user() and put_user()\")\n\nreplaced _ASM_EXTABLE_UA() with _ASM_EXTABLE() for {get, put}_user()\nfixups. However, the new fixup type EX_TYPE_DEFAULT results in a panic.\n\nCommit\n\n  6014bc27561f (\"x86-64: make access_ok() independent of LAM\")\n\nadded the check gp_fault_address_ok() right before the WARN_ONCE() in\nex_handler_uaccess() to not warn about non-canonical user addresses due\nto LAM.\n\nWith that in place, revert back to _ASM_EXTABLE_UA() for {get,put}_user()\nexception fixups in order to be able to handle in-kernel MCEs correctly\nagain.\n\n  [ bp: Massage commit message. ]",
      "id": "GSD-2024-26674",
      "modified": "2024-02-20T06:02:29.228128Z",
      "schema_version": "1.4.0"
    }
  },
  "namespaces": {
    "cve.org": {
      "CVE_data_meta": {
        "ASSIGNER": "cve@kernel.org",
        "ID": "CVE-2024-26674",
        "STATE": "PUBLIC"
      },
      "affects": {
        "vendor": {
          "vendor_data": [
            {
              "product": {
                "product_data": [
                  {
                    "product_name": "Linux",
                    "version": {
                      "version_data": [
                        {
                          "version_affected": "\u003c",
                          "version_name": "b19b74bc99b1",
                          "version_value": "2aed1b6c33af"
                        },
                        {
                          "version_value": "not down converted",
                          "x_cve_json_5_version_data": {
                            "defaultStatus": "affected",
                            "versions": [
                              {
                                "status": "affected",
                                "version": "6.4"
                              },
                              {
                                "lessThan": "6.4",
                                "status": "unaffected",
                                "version": "0",
                                "versionType": "custom"
                              },
                              {
                                "lessThanOrEqual": "6.6.*",
                                "status": "unaffected",
                                "version": "6.6.17",
                                "versionType": "custom"
                              },
                              {
                                "lessThanOrEqual": "6.7.*",
                                "status": "unaffected",
                                "version": "6.7.5",
                                "versionType": "custom"
                              },
                              {
                                "lessThanOrEqual": "*",
                                "status": "unaffected",
                                "version": "6.8",
                                "versionType": "original_commit_for_fix"
                              }
                            ]
                          }
                        }
                      ]
                    }
                  }
                ]
              },
              "vendor_name": "Linux"
            }
          ]
        }
      },
      "data_format": "MITRE",
      "data_type": "CVE",
      "data_version": "4.0",
      "description": {
        "description_data": [
          {
            "lang": "eng",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nx86/lib: Revert to _ASM_EXTABLE_UA() for {get,put}_user() fixups\n\nDuring memory error injection test on kernels \u003e= v6.4, the kernel panics\nlike below. However, this issue couldn\u0027t be reproduced on kernels \u003c= v6.3.\n\n  mce: [Hardware Error]: CPU 296: Machine Check Exception: f Bank 1: bd80000000100134\n  mce: [Hardware Error]: RIP 10:\u003cffffffff821b9776\u003e {__get_user_nocheck_4+0x6/0x20}\n  mce: [Hardware Error]: TSC 411a93533ed ADDR 346a8730040 MISC 86\n  mce: [Hardware Error]: PROCESSOR 0:a06d0 TIME 1706000767 SOCKET 1 APIC 211 microcode 80001490\n  mce: [Hardware Error]: Run the above through \u0027mcelog --ascii\u0027\n  mce: [Hardware Error]: Machine check: Data load in unrecoverable area of kernel\n  Kernel panic - not syncing: Fatal local machine check\n\nThe MCA code can recover from an in-kernel #MC if the fixup type is\nEX_TYPE_UACCESS, explicitly indicating that the kernel is attempting to\naccess userspace memory. However, if the fixup type is EX_TYPE_DEFAULT\nthe only thing that is raised for an in-kernel #MC is a panic.\n\nex_handler_uaccess() would warn if users gave a non-canonical addresses\n(with bit 63 clear) to {get, put}_user(), which was unexpected.\n\nTherefore, commit\n\n  b19b74bc99b1 (\"x86/mm: Rework address range check in get_user() and put_user()\")\n\nreplaced _ASM_EXTABLE_UA() with _ASM_EXTABLE() for {get, put}_user()\nfixups. However, the new fixup type EX_TYPE_DEFAULT results in a panic.\n\nCommit\n\n  6014bc27561f (\"x86-64: make access_ok() independent of LAM\")\n\nadded the check gp_fault_address_ok() right before the WARN_ONCE() in\nex_handler_uaccess() to not warn about non-canonical user addresses due\nto LAM.\n\nWith that in place, revert back to _ASM_EXTABLE_UA() for {get,put}_user()\nexception fixups in order to be able to handle in-kernel MCEs correctly\nagain.\n\n  [ bp: Massage commit message. ]"
          }
        ]
      },
      "generator": {
        "engine": "bippy-b4257b672505"
      },
      "problemtype": {
        "problemtype_data": [
          {
            "description": [
              {
                "lang": "eng",
                "value": "n/a"
              }
            ]
          }
        ]
      },
      "references": {
        "reference_data": [
          {
            "name": "https://git.kernel.org/stable/c/2aed1b6c33afd8599d01c6532bbecb829480a674",
            "refsource": "MISC",
            "url": "https://git.kernel.org/stable/c/2aed1b6c33afd8599d01c6532bbecb829480a674"
          },
          {
            "name": "https://git.kernel.org/stable/c/2da241c5ed78d0978228a1150735539fe1a60eca",
            "refsource": "MISC",
            "url": "https://git.kernel.org/stable/c/2da241c5ed78d0978228a1150735539fe1a60eca"
          },
          {
            "name": "https://git.kernel.org/stable/c/8eed4e00a370b37b4e5985ed983dccedd555ea9d",
            "refsource": "MISC",
            "url": "https://git.kernel.org/stable/c/8eed4e00a370b37b4e5985ed983dccedd555ea9d"
          }
        ]
      }
    },
    "nvd.nist.gov": {
      "cve": {
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nx86/lib: Revert to _ASM_EXTABLE_UA() for {get,put}_user() fixups\n\nDuring memory error injection test on kernels \u003e= v6.4, the kernel panics\nlike below. However, this issue couldn\u0027t be reproduced on kernels \u003c= v6.3.\n\n  mce: [Hardware Error]: CPU 296: Machine Check Exception: f Bank 1: bd80000000100134\n  mce: [Hardware Error]: RIP 10:\u003cffffffff821b9776\u003e {__get_user_nocheck_4+0x6/0x20}\n  mce: [Hardware Error]: TSC 411a93533ed ADDR 346a8730040 MISC 86\n  mce: [Hardware Error]: PROCESSOR 0:a06d0 TIME 1706000767 SOCKET 1 APIC 211 microcode 80001490\n  mce: [Hardware Error]: Run the above through \u0027mcelog --ascii\u0027\n  mce: [Hardware Error]: Machine check: Data load in unrecoverable area of kernel\n  Kernel panic - not syncing: Fatal local machine check\n\nThe MCA code can recover from an in-kernel #MC if the fixup type is\nEX_TYPE_UACCESS, explicitly indicating that the kernel is attempting to\naccess userspace memory. However, if the fixup type is EX_TYPE_DEFAULT\nthe only thing that is raised for an in-kernel #MC is a panic.\n\nex_handler_uaccess() would warn if users gave a non-canonical addresses\n(with bit 63 clear) to {get, put}_user(), which was unexpected.\n\nTherefore, commit\n\n  b19b74bc99b1 (\"x86/mm: Rework address range check in get_user() and put_user()\")\n\nreplaced _ASM_EXTABLE_UA() with _ASM_EXTABLE() for {get, put}_user()\nfixups. However, the new fixup type EX_TYPE_DEFAULT results in a panic.\n\nCommit\n\n  6014bc27561f (\"x86-64: make access_ok() independent of LAM\")\n\nadded the check gp_fault_address_ok() right before the WARN_ONCE() in\nex_handler_uaccess() to not warn about non-canonical user addresses due\nto LAM.\n\nWith that in place, revert back to _ASM_EXTABLE_UA() for {get,put}_user()\nexception fixups in order to be able to handle in-kernel MCEs correctly\nagain.\n\n  [ bp: Massage commit message. ]"
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: x86/lib: vuelva a _ASM_EXTABLE_UA() para reparaciones de {get,put}_user() Durante la prueba de inyecci\u00f3n de errores de memoria en kernels \u0026gt;= v6.4, el kernel entra en p\u00e1nico como se muestra a continuaci\u00f3n. Sin embargo, este problema no se pudo reproducir en kernels \u0026lt;= v6.3. mce: [Error de hardware]: CPU 296: Excepci\u00f3n de verificaci\u00f3n de la m\u00e1quina: f Banco 1: bd80000000100134 mce: [Error de hardware]: RIP 10: {__get_user_nocheck_4+0x6/0x20} mce: [Error de hardware]: TSC 411a93533ed ADDR 346a87300 40 MISC 86 mce: [Error de hardware]: PROCESADOR 0:a06d0 HORA 1706000767 SOCKET 1 APIC 211 microc\u00f3digo 80001490 mce: [Error de hardware]: Ejecute lo anterior a trav\u00e9s de \u0027mcelog --ascii\u0027 mce: [Error de hardware]: Verificaci\u00f3n de la m\u00e1quina: Carga de datos en un \u00e1rea irrecuperable del kernel P\u00e1nico del kernel - no se sincroniza: verificaci\u00f3n fatal de la m\u00e1quina local El c\u00f3digo MCA se puede recuperar de un #MC en el kernel si el tipo de reparaci\u00f3n es EX_TYPE_UACCESS, lo que indica expl\u00edcitamente que el kernel est\u00e1 intentando acceder a la memoria del espacio de usuario. Sin embargo, si el tipo de reparaci\u00f3n es EX_TYPE_DEFAULT, lo \u00fanico que se genera para un #MC en el kernel es p\u00e1nico. ex_handler_uaccess() advertir\u00eda si los usuarios proporcionaban direcciones no can\u00f3nicas (con el bit 63 claro) a {get, put}_user(), lo cual era inesperado. Por lo tanto, el commit b19b74bc99b1 (\"x86/mm: Reelaborar la verificaci\u00f3n del rango de direcciones en get_user() y put_user()\") reemplaz\u00f3 _ASM_EXTABLE_UA() con _ASM_EXTABLE() para las correcciones de {get, put}_user(). Sin embargo, el nuevo tipo de reparaci\u00f3n EX_TYPE_DEFAULT provoca p\u00e1nico. El commit 6014bc27561f (\"x86-64: hacer que access_ok() sea independiente de LAM\") agreg\u00f3 la verificaci\u00f3n gp_fault_address_ok() justo antes de WARN_ONCE() en ex_handler_uaccess() para no advertir sobre direcciones de usuarios no can\u00f3nicas debido a LAM. Una vez implementado esto, vuelva a _ASM_EXTABLE_UA() para corregir excepciones de {get,put}_user() para poder manejar correctamente los MCE en el kernel nuevamente. [pb: mensaje de commit. ]"
          }
        ],
        "id": "CVE-2024-26674",
        "lastModified": "2024-04-02T12:50:42.233",
        "metrics": {},
        "published": "2024-04-02T07:15:44.033",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/2aed1b6c33afd8599d01c6532bbecb829480a674"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/2da241c5ed78d0978228a1150735539fe1a60eca"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/8eed4e00a370b37b4e5985ed983dccedd555ea9d"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Awaiting Analysis"
      }
    }
  }
}