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CVE PROGRAM SOURCE RECORDUnscored

CVE-2022-50222

tty: vt: initialize unicode screen buffer

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Status
Published
Published
Updated
Assigning organization
Linux

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

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • d8ae7242718738ee1bf9bfdd632d2a4b150fdd26 to < e02fa87e572bb7d90dcdbce9c0f519f1eb992e96affected
  • d8ae7242718738ee1bf9bfdd632d2a4b150fdd26 to < cc9e874dace0c89ae535230c7da19b764746811eaffected
  • d8ae7242718738ee1bf9bfdd632d2a4b150fdd26 to < 5c6c65681f39bf71bc72ed589dec3b8b20e75cacaffected
  • d8ae7242718738ee1bf9bfdd632d2a4b150fdd26 to < 446f123aa6021e5f75a20789f05ff3f7ae51a42faffected
  • d8ae7242718738ee1bf9bfdd632d2a4b150fdd26 to < 777a462e1ae50a01fc4a871efa8e34d596a1e17daffected
  • d8ae7242718738ee1bf9bfdd632d2a4b150fdd26 to < e0ef23e9b0ad18b9fd3741b0f1ad2282e4a18defaffected
  • d8ae7242718738ee1bf9bfdd632d2a4b150fdd26 to < af77c56aa35325daa2bc2bed5c2ebf169be61b86affected

Linux Linux

Default version status: affected

  • 4.19affected
  • 0 to < 4.19unaffected
  • 4.19.256 to ≤ 4.19.*unaffected
  • 5.4.211 to ≤ 5.4.*unaffected
  • 5.10.137 to ≤ 5.10.*unaffected
  • 5.15.61 to ≤ 5.15.*unaffected
  • 5.18.18 to ≤ 5.18.*unaffected
  • 5.19.2 to ≤ 5.19.*unaffected
  • 6.0 to ≤ *unaffected

References