Instituto Nacional de ciberseguridad. Sección Incibe
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CVE-2022-50222

Severity CVSS v4.0:
Pending analysis
Type:
Unavailable / Other
Publication date:
18/06/2025
Last modified:
19/11/2025

Description

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> tty: vt: initialize unicode screen buffer<br /> <br /> syzbot reports kernel infoleak at vcs_read() [1], for buffer can be read<br /> immediately after resize operation. Initialize buffer using kzalloc().<br /> <br /> ----------<br /> #include <br /> #include <br /> #include <br /> #include <br /> <br /> int main(int argc, char *argv[])<br /> {<br /> struct fb_var_screeninfo var = { };<br /> const int fb_fd = open("/dev/fb0", 3);<br /> ioctl(fb_fd, FBIOGET_VSCREENINFO, &amp;var);<br /> var.yres = 0x21;<br /> ioctl(fb_fd, FBIOPUT_VSCREENINFO, &amp;var);<br /> return read(open("/dev/vcsu", O_RDONLY), &amp;var, sizeof(var)) == -1;<br /> }<br /> ----------

Impact

Vector 3.x
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CVSS v3.1 Severity and Metrics:

Base Score: 5.50 MEDIUM
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Attack Vector (AV): Local
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): None
Integrity (I): None
Availability (A): High

Base Score 3.x
5.50
Severity 3.x
MEDIUM

Vulnerable products and versions

CPE From Up to
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 4.19 (including) 4.19.256 (excluding)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 4.20 (including) 5.4.211 (excluding)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 5.5 (including) 5.10.137 (excluding)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 5.11 (including) 5.15.61 (excluding)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 5.16 (including) 5.18.18 (excluding)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 5.19 (including) 5.19.2 (excluding)

To consult the complete list of CPE names with products and versions, see this page


References to Advisories, Solutions, and Tools