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CVE-2022-50222

tty: vt: initialize unicode screen buffer PUBLISHED

Description (CNA)

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 (CNA)

Vendor / productVersions
Linux / Linuxaffected d8ae7242718738ee1bf9bfdd632d2a4b150fdd26 before e02fa87e572bb7d90dcdbce9c0f519f1eb992e96; affected d8ae7242718738ee1bf9bfdd632d2a4b150fdd26 before cc9e874dace0c89ae535230c7da19b764746811e; affected d8ae7242718738ee1bf9bfdd632d2a4b150fdd26 before 5c6c65681f39bf71bc72ed589dec3b8b20e75cac; affected d8ae7242718738ee1bf9bfdd632d2a4b150fdd26 before 446f123aa6021e5f75a20789f05ff3f7ae51a42f; affected d8ae7242718738ee1bf9bfdd632d2a4b150fdd26 before 777a462e1ae50a01fc4a871efa8e34d596a1e17d; affected d8ae7242718738ee1bf9bfdd632d2a4b150fdd26 before e0ef23e9b0ad18b9fd3741b0f1ad2282e4a18def; affected d8ae7242718738ee1bf9bfdd632d2a4b150fdd26 before af77c56aa35325daa2bc2bed5c2ebf169be61b86
Linux / Linuxaffected 4.19; unaffected 0 before 4.19; unaffected 4.19.256 through 4.19.*; unaffected 5.4.211 through 5.4.*; unaffected 5.10.137 through 5.10.*; unaffected 5.15.61 through 5.15.*; unaffected 5.18.18 through 5.18.*; unaffected 5.19.2 through 5.19.*; unaffected 6.0 through *

CWE

No CWE identifiers supplied.

References