CVE-2022-50222
Estado: AnalizadaMedia (5.5)—
In the Linux kernel, the following vulnerability has been resolved:
tty: vt: initialize unicode screen buffer
syzbot reports kernel infoleak at vcs_read() [1], for buffer can be read immediately after resize operation. Initialize buffer using kzalloc().
Detalles técnicos trazas, registros y código del informe original
----------
#include <fcntl.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <linux/fb.h>
int main(int argc, char *argv[])
{
struct fb_var_screeninfo var = { };
const int fb_fd = open("/dev/fb0", 3);
ioctl(fb_fd, FBIOGET_VSCREENINFO, &var);
var.yres = 0x21;
ioctl(fb_fd, FBIOPUT_VSCREENINFO, &var);
return read(open("/dev/vcsu", O_RDONLY), &var, sizeof(var)) == -1;
}
----------CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Puntuación base: 5.5
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.23%
- Percentil entre todas las CVEs puntuadas: 13
- Fecha de la puntuación: 6/10/2026
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).
Tecnologías afectadas (1)
CWE
- NVD-CWE-noinfo
Referencias
- https://git.kernel.org/stable/c/446f123aa6021e5f75a20789f05ff3f7ae51a42f
- https://git.kernel.org/stable/c/5c6c65681f39bf71bc72ed589dec3b8b20e75cac
- https://git.kernel.org/stable/c/777a462e1ae50a01fc4a871efa8e34d596a1e17d
- https://git.kernel.org/stable/c/af77c56aa35325daa2bc2bed5c2ebf169be61b86
- https://git.kernel.org/stable/c/cc9e874dace0c89ae535230c7da19b764746811e
- https://git.kernel.org/stable/c/e02fa87e572bb7d90dcdbce9c0f519f1eb992e96
- https://git.kernel.org/stable/c/e0ef23e9b0ad18b9fd3741b0f1ad2282e4a18def
JSON original (NVD)
Mostrar
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"integrityImpact": "NONE",
"userInteraction": "NONE",
"attackComplexity": "LOW",
"availabilityImpact": "HIGH",
"privilegesRequired": "LOW",
"confidentialityImpact": "NONE"
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"descriptions": [
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntty: vt: initialize unicode screen buffer\n\nsyzbot reports kernel infoleak at vcs_read() [1], for buffer can be read\nimmediately after resize operation. Initialize buffer using kzalloc().\n\n ----------\n #include <fcntl.h>\n #include <unistd.h>\n #include <sys/ioctl.h>\n #include <linux/fb.h>\n\n int main(int argc, char *argv[])\n {\n struct fb_var_screeninfo var = { };\n const int fb_fd = open(\"/dev/fb0\", 3);\n ioctl(fb_fd, FBIOGET_VSCREENINFO, &var);\n var.yres = 0x21;\n ioctl(fb_fd, FBIOPUT_VSCREENINFO, &var);\n return read(open(\"/dev/vcsu\", O_RDONLY), &var, sizeof(var)) == -1;\n }\n ----------"
},
{
"lang": "es",
"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: tty: vt: al inicializar el búfer de pantalla Unicode, syzbot reporta una fuga de información del kernel en vcs_read() [1], ya que el búfer se puede leer inmediatamente después de la operación de cambio de tamaño. Inicialice el búfer con kzalloc(). ---------- #include #include #include #include int main(int argc, char *argv[]) { struct fb_var_screeninfo var = { }; const int fb_fd = open(\"/dev/fb0\", 3); ioctl(fb_fd, FBIOGET_VSCREENINFO, &var); var.yres = 0x21; ioctl(fb_fd, FBIOPUT_VSCREENINFO, &var); return read(open(\"/dev/vcsu\", O_RDONLY), &var, sizeof(var)) == -1; } ---------- "
}
],
"lastModified": "2026-06-17T05:23:00.653",
"configurations": [
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