fkie_cve-2022-50080
Vulnerability from fkie_nvd
Published
2025-06-18 11:15
Modified
2025-11-18 02:39
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: tee: add overflow check in register_shm_helper() With special lengths supplied by user space, register_shm_helper() has an integer overflow when calculating the number of pages covered by a supplied user space memory region. This causes internal_get_user_pages_fast() a helper function of pin_user_pages_fast() to do a NULL pointer dereference: Unable to handle kernel NULL pointer dereference at virtual address 0000000000000010 Modules linked in: CPU: 1 PID: 173 Comm: optee_example_a Not tainted 5.19.0 #11 Hardware name: QEMU QEMU Virtual Machine, BIOS 0.0.0 02/06/2015 pc : internal_get_user_pages_fast+0x474/0xa80 Call trace: internal_get_user_pages_fast+0x474/0xa80 pin_user_pages_fast+0x24/0x4c register_shm_helper+0x194/0x330 tee_shm_register_user_buf+0x78/0x120 tee_ioctl+0xd0/0x11a0 __arm64_sys_ioctl+0xa8/0xec invoke_syscall+0x48/0x114 Fix this by adding an an explicit call to access_ok() in tee_shm_register_user_buf() to catch an invalid user space address early.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2f8e79a1a6128214cb9b205a9869341af5dfb16bPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/573ae4f13f630d6660008f1974c0a8a29c30e18aPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/578c349570d2a912401963783b36e0ec7a25c053Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/58c008d4d398f792ca67f35650610864725518fdPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/965333345fe952cc7eebc8e3a565ffc709441af2Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b37e0f17653c00b586cdbcdf0dbca475358ecffdPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c12f0e6126ad223806a365084e86370511654bf1Patch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 6.0


To clipboard 

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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntee: add overflow check in register_shm_helper()\n\nWith special lengths supplied by user space, register_shm_helper() has\nan integer overflow when calculating the number of pages covered by a\nsupplied user space memory region.\n\nThis causes internal_get_user_pages_fast() a helper function of\npin_user_pages_fast() to do a NULL pointer dereference:\n\n  Unable to handle kernel NULL pointer dereference at virtual address 0000000000000010\n  Modules linked in:\n  CPU: 1 PID: 173 Comm: optee_example_a Not tainted 5.19.0 #11\n  Hardware name: QEMU QEMU Virtual Machine, BIOS 0.0.0 02/06/2015\n  pc : internal_get_user_pages_fast+0x474/0xa80\n  Call trace:\n   internal_get_user_pages_fast+0x474/0xa80\n   pin_user_pages_fast+0x24/0x4c\n   register_shm_helper+0x194/0x330\n   tee_shm_register_user_buf+0x78/0x120\n   tee_ioctl+0xd0/0x11a0\n   __arm64_sys_ioctl+0xa8/0xec\n   invoke_syscall+0x48/0x114\n\nFix this by adding an an explicit call to access_ok() in\ntee_shm_register_user_buf() to catch an invalid user space address\nearly."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: tee: agregar verificaci\u00f3n de desbordamiento en register_shm_helper(). Con longitudes especiales suministradas por el espacio de usuario, register_shm_helper() tiene un desbordamiento de entero al calcular la cantidad de p\u00e1ginas cubiertas por una regi\u00f3n de memoria del espacio de usuario suministrada. Esto hace que internal_get_user_pages_fast(), una funci\u00f3n auxiliar de pin_user_pages_fast(), realice una desreferencia de puntero NULL: No se puede manejar la desreferencia de puntero NULL del n\u00facleo en la direcci\u00f3n virtual 0000000000000010 M\u00f3dulos vinculados: CPU: 1 PID: 173 Comm: optee_example_a No contaminado 5.19.0 #11 Nombre del hardware: QEMU QEMU Virtual Machine, BIOS 0.0.0 02/06/2015 pc : internal_get_user_pages_fast+0x474/0xa80 Rastreo de llamadas: internal_get_user_pages_fast+0x474/0xa80 pin_user_pages_fast+0x24/0x4c register_shm_helper+0x194/0x330 tee_shm_register_user_buf+0x78/0x120 tee_ioctl+0xd0/0x11a0 __arm64_sys_ioctl+0xa8/0xec invoke_syscall+0x48/0x114 Solucione esto agregando una llamada expl\u00edcita a access_ok() en tee_shm_register_user_buf() para detectar de manera temprana una direcci\u00f3n de espacio de usuario no v\u00e1lida."
    }
  ],
  "id": "CVE-2022-50080",
  "lastModified": "2025-11-18T02:39:52.973",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
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  "published": "2025-06-18T11:15:36.980",
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  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-476"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}


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