---
id: CVE-2022-50222
title: 'tty: vt: initialize unicode screen buffer'
summary: |-
  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 buffe…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= d8ae7242718738ee1bf9bfdd632d2a4b150fdd26 <
    e02fa87e572bb7d90dcdbce9c0f519f1eb992e96
  - >-
    Linux >= d8ae7242718738ee1bf9bfdd632d2a4b150fdd26 <
    cc9e874dace0c89ae535230c7da19b764746811e
  - >-
    Linux >= d8ae7242718738ee1bf9bfdd632d2a4b150fdd26 <
    5c6c65681f39bf71bc72ed589dec3b8b20e75cac
  - >-
    Linux >= d8ae7242718738ee1bf9bfdd632d2a4b150fdd26 <
    446f123aa6021e5f75a20789f05ff3f7ae51a42f
  - >-
    Linux >= d8ae7242718738ee1bf9bfdd632d2a4b150fdd26 <
    777a462e1ae50a01fc4a871efa8e34d596a1e17d
  - >-
    Linux >= d8ae7242718738ee1bf9bfdd632d2a4b150fdd26 <
    e0ef23e9b0ad18b9fd3741b0f1ad2282e4a18def
  - >-
    Linux >= d8ae7242718738ee1bf9bfdd632d2a4b150fdd26 <
    af77c56aa35325daa2bc2bed5c2ebf169be61b86
  - Linux 4.19
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-05T20:07:09.649669Z'
published: '2025-06-18'
updated: '2026-11-05'
sourceUpdated: '2026-11-05T20:10:29.522Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2022-50222'
references:
  - url: 'https://git.kernel.org/stable/c/e02fa87e572bb7d90dcdbce9c0f519f1eb992e96'
  - url: 'https://git.kernel.org/stable/c/cc9e874dace0c89ae535230c7da19b764746811e'
  - url: 'https://git.kernel.org/stable/c/5c6c65681f39bf71bc72ed589dec3b8b20e75cac'
  - url: 'https://git.kernel.org/stable/c/446f123aa6021e5f75a20789f05ff3f7ae51a42f'
  - url: 'https://git.kernel.org/stable/c/777a462e1ae50a01fc4a871efa8e34d596a1e17d'
  - url: 'https://git.kernel.org/stable/c/e0ef23e9b0ad18b9fd3741b0f1ad2282e4a18def'
  - url: 'https://git.kernel.org/stable/c/af77c56aa35325daa2bc2bed5c2ebf169be61b86'
tags:
  - cve.org
epss: 0.00236
epssPercentile: 0.14652
ingestedAt: '2026-11-05T22:38:31.705Z'
---

## Overview

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;
  }
  ----------

## Affected

- `Linux >= d8ae7242718738ee1bf9bfdd632d2a4b150fdd26 < e02fa87e572bb7d90dcdbce9c0f519f1eb992e96`
- `Linux >= d8ae7242718738ee1bf9bfdd632d2a4b150fdd26 < cc9e874dace0c89ae535230c7da19b764746811e`
- `Linux >= d8ae7242718738ee1bf9bfdd632d2a4b150fdd26 < 5c6c65681f39bf71bc72ed589dec3b8b20e75cac`
- `Linux >= d8ae7242718738ee1bf9bfdd632d2a4b150fdd26 < 446f123aa6021e5f75a20789f05ff3f7ae51a42f`
- `Linux >= d8ae7242718738ee1bf9bfdd632d2a4b150fdd26 < 777a462e1ae50a01fc4a871efa8e34d596a1e17d`
- `Linux >= d8ae7242718738ee1bf9bfdd632d2a4b150fdd26 < e0ef23e9b0ad18b9fd3741b0f1ad2282e4a18def`
- `Linux >= d8ae7242718738ee1bf9bfdd632d2a4b150fdd26 < af77c56aa35325daa2bc2bed5c2ebf169be61b86`
- `Linux 4.19`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.