CVE-2022-50222 (GCVE-0-2022-50222)
Vulnerability from cvelistv5
Published
2025-06-18 11:03
Modified
2025-06-18 11:03
Severity ?
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 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; } ----------
References
Impacted products
Vendor Product Version
Linux Linux Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
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{
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          "programFiles": [
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              "version": "5.19.2",
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              "status": "unaffected",
              "version": "6.0",
              "versionType": "original_commit_for_fix"
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      "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 \u003cfcntl.h\u003e\n  #include \u003cunistd.h\u003e\n  #include \u003csys/ioctl.h\u003e\n  #include \u003clinux/fb.h\u003e\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, \u0026var);\n    var.yres = 0x21;\n    ioctl(fb_fd, FBIOPUT_VSCREENINFO, \u0026var);\n    return read(open(\"/dev/vcsu\", O_RDONLY), \u0026var, sizeof(var)) == -1;\n  }\n  ----------"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-06-18T11:03:56.744Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/e02fa87e572bb7d90dcdbce9c0f519f1eb992e96"
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        {
          "url": "https://git.kernel.org/stable/c/af77c56aa35325daa2bc2bed5c2ebf169be61b86"
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      ],
      "title": "tty: vt: initialize unicode screen buffer",
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    "cveId": "CVE-2022-50222",
    "datePublished": "2025-06-18T11:03:56.744Z",
    "dateReserved": "2025-06-18T10:57:27.430Z",
    "dateUpdated": "2025-06-18T11:03:56.744Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2022-50222\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-06-18T11:15:53.193\",\"lastModified\":\"2025-06-18T13:47:40.833\",\"vulnStatus\":\"Awaiting Analysis\",\"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 \u003cfcntl.h\u003e\\n  #include \u003cunistd.h\u003e\\n  #include \u003csys/ioctl.h\u003e\\n  #include \u003clinux/fb.h\u003e\\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, \u0026var);\\n    var.yres = 0x21;\\n    ioctl(fb_fd, FBIOPUT_VSCREENINFO, \u0026var);\\n    return read(open(\\\"/dev/vcsu\\\", O_RDONLY), \u0026var, sizeof(var)) == -1;\\n  }\\n  ----------\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: tty: vt: al inicializar el b\u00fafer de pantalla Unicode, syzbot reporta una fuga de informaci\u00f3n del kernel en vcs_read() [1], ya que el b\u00fafer se puede leer inmediatamente despu\u00e9s de la operaci\u00f3n de cambio de tama\u00f1o. Inicialice el b\u00fafer 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, \u0026amp;var); var.yres = 0x21; ioctl(fb_fd, FBIOPUT_VSCREENINFO, \u0026amp;var); return read(open(\\\"/dev/vcsu\\\", O_RDONLY), \u0026amp;var, sizeof(var)) == -1; } ---------- \"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/446f123aa6021e5f75a20789f05ff3f7ae51a42f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5c6c65681f39bf71bc72ed589dec3b8b20e75cac\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/777a462e1ae50a01fc4a871efa8e34d596a1e17d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/af77c56aa35325daa2bc2bed5c2ebf169be61b86\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/cc9e874dace0c89ae535230c7da19b764746811e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e02fa87e572bb7d90dcdbce9c0f519f1eb992e96\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e0ef23e9b0ad18b9fd3741b0f1ad2282e4a18def\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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