CVE-2022-50222
Full vulnerability record from the local CVENow database.
Description
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(). ---------- #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; } ----------
Severity
MEDIUM
CVSS score
5.5
(v3.1)
Vulnerability status
Analyzed
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2025-06-18 11:15:53.193000
Last modified
2026-11-05 20:17:27.950000
View original CVE JSON
{
"id": "CVE-2022-50222",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2025-06-18T11:15:53.193",
"lastModified": "2026-11-05T20:17:27.950",
"vulnStatus": "Analyzed",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"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; } ---------- "
}
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"source": "[email protected]",
"type": "Primary",
"cvssData": {
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"baseScore": 5.5,
"baseSeverity": "MEDIUM",
"attackVector": "LOCAL",
"attackComplexity": "LOW",
"privilegesRequired": "LOW",
"userInteraction": "NONE",
"scope": "UNCHANGED",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"availabilityImpact": "HIGH"
},
"exploitabilityScore": 1.8,
"impactScore": 3.6
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],
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"ssvcData": {
"timestamp": "2026-11-05T20:07:09.649669Z",
"id": "CVE-2022-50222",
"options": [
{
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},
{
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],
"role": "CISA Coordinator",
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"weaknesses": [
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"source": "[email protected]",
"type": "Primary",
"description": [
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