CVE-2022-50080
Full vulnerability record from the local CVENow database.
Description
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.
Severity
MEDIUM
CVSS score
5.5
(v3.1)
Vulnerability status
Analyzed
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2025-06-18 11:15:36.980000
Last modified
2026-11-05 20:17:22.740000
View original CVE JSON
{
"id": "CVE-2022-50080",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2025-06-18T11:15:36.980",
"lastModified": "2026-11-05T20:17:22.740",
"vulnStatus": "Analyzed",
"cveTags": [],
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{
"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 verificación 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 páginas cubiertas por una región de memoria del espacio de usuario suministrada. Esto hace que internal_get_user_pages_fast(), una función auxiliar de pin_user_pages_fast(), realice una desreferencia de puntero NULL: No se puede manejar la desreferencia de puntero NULL del núcleo en la dirección virtual 0000000000000010 Módulos 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 explícita a access_ok() en tee_shm_register_user_buf() para detectar de manera temprana una dirección de espacio de usuario no válida."
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"attackComplexity": "LOW",
"privilegesRequired": "LOW",
"userInteraction": "NONE",
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