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CVE-2022-50099

Estado: ModificadaAlta (7.8)—

In the Linux kernel, the following vulnerability has been resolved:

video: fbdev: arkfb: Check the size of screen before memset_io()

In the function arkfb_set_par(), the value of 'screen_size' is calculated by the user input. If the user provides the improper value, the value of 'screen_size' may larger than 'info->screen_size', which may cause the following bug:

Fix the this by checking the value of 'screen_size' before memset_io().

Detalles técnicos trazas, registros y código del informe original
[  659.399066] BUG: unable to handle page fault for address: ffffc90003000000
[  659.399077] #PF: supervisor write access in kernel mode
[  659.399079] #PF: error_code(0x0002) - not-present page
[  659.399094] RIP: 0010:memset_orig+0x33/0xb0
[  659.399116] Call Trace:
[  659.399122]  arkfb_set_par+0x143f/0x24c0
[  659.399130]  fb_set_var+0x604/0xeb0
[  659.399161]  do_fb_ioctl+0x234/0x670
[  659.399189]  fb_ioctl+0xdd/0x130

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

Acceso local (AV:L) sin interacción (UI:N) con privilegios de usuario (PR:L). Fallo de validación en arkfb_set_par() permite escribir fuera de límites de memoria, causando DoS (page fault) o corrupción de datos.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Threat Intelligence ProgramRestrict File and Directory PermissionsRemote Data StorageFilter Network TrafficExecution PreventionEncrypt Sensitive Information

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

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      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nvideo: fbdev: arkfb: Check the size of screen before memset_io()\n\nIn the function arkfb_set_par(), the value of 'screen_size' is\ncalculated by the user input. If the user provides the improper value,\nthe value of 'screen_size' may larger than 'info->screen_size', which\nmay cause the following bug:\n\n[  659.399066] BUG: unable to handle page fault for address: ffffc90003000000\n[  659.399077] #PF: supervisor write access in kernel mode\n[  659.399079] #PF: error_code(0x0002) - not-present page\n[  659.399094] RIP: 0010:memset_orig+0x33/0xb0\n[  659.399116] Call Trace:\n[  659.399122]  arkfb_set_par+0x143f/0x24c0\n[  659.399130]  fb_set_var+0x604/0xeb0\n[  659.399161]  do_fb_ioctl+0x234/0x670\n[  659.399189]  fb_ioctl+0xdd/0x130\n\nFix the this by checking the value of 'screen_size' before memset_io()."
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    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: video: fbdev: arkfb: Verifique el tamaño de la pantalla antes de memset_io() En la función arkfb_set_par(), el valor de 'screen_size' se calcula mediante la entrada del usuario. Si el usuario proporciona un valor incorrecto, el valor de 'screen_size' puede ser mayor que 'info->screen_size', lo que puede causar el siguiente error: [ 659.399066] ERROR: no se puede manejar el error de página para la dirección: ffffc90003000000 [ 659.399077] #PF: acceso de escritura del supervisor en modo kernel [ 659.399079] #PF: error_code(0x0002) - página no presente [ 659.399094] RIP: 0010:memset_orig+0x33/0xb0 [ 659.399116] Rastreo de llamadas: [ 659.399122] arkfb_set_par+0x143f/0x24c0 [ 659.399130] fb_set_var+0x604/0xeb0 [ 659.399161] do_fb_ioctl+0x234/0x670 [ 659.399189] fb_ioctl+0xdd/0x130 Solucione este problema comprobando el valor de 'screen_size' antes de memset_io()."
    }
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  "lastModified": "2026-08-04T10:18:05.217",
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