CVE-2022-50222
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.
Does this matter?
Lower severity and a low EPSS score (0.21%). Track it; it rarely justifies an emergency change on its own.
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; } ----------
- CVSS 3.1
- 5.5 MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 0.21% probability · 12th percentile
- CISA KEV
- Not listed
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/446f123aa6021e5f75a20789f05ff3f7ae51a42fPatch
- https://git.kernel.org/stable/c/5c6c65681f39bf71bc72ed589dec3b8b20e75cacPatch
- https://git.kernel.org/stable/c/777a462e1ae50a01fc4a871efa8e34d596a1e17dPatch
- https://git.kernel.org/stable/c/af77c56aa35325daa2bc2bed5c2ebf169be61b86Patch
- https://git.kernel.org/stable/c/cc9e874dace0c89ae535230c7da19b764746811ePatch
- https://git.kernel.org/stable/c/e02fa87e572bb7d90dcdbce9c0f519f1eb992e96Patch
- https://git.kernel.org/stable/c/e0ef23e9b0ad18b9fd3741b0f1ad2282e4a18defPatch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.