CVE-2021-47383

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: tty: Fix out-of-bound vmalloc access in imageblit This issue happens when a userspace program does an ioctl FBIOPUT_VSCREENINFO passing the fb_var_screeninfo struct containing only the fields xres, yres, and bits_per_pixel with values. If this struct is the same as the previous ioctl, the vc_resize() detects it and doesn't call the resize_screen(), leaving the fb_var_screeninfo incomplete. And this leads to the updatescrollmode() calculates a wrong value to fbcon_display->vrows, which makes the real_y() return a wrong value...

Affected product and versions

Product

Linux Linux, linux kernel

Affected versions

>= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 7e71fcedfda6f7de18f850a6b36e78d78b04476f, >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 70aed03b1d5a5df974f456cdc8eedb213c94bb8b, >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 067c694d06040db6f0c65281bb358452ca6d85b9, >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 8a6a240f52e14356386030d8958ae8b1761d2325, >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 883f7897a25e3ce14a7f274ca4c73f49ac84002a, >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < d570c48dd37dbe8fc6875d4461d01a9554ae2560, >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 699d926585daa6ec44be556cdc1ab89e5d54557b, >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 3b0c406124719b625b1aba431659f5cdc24a982c, >= 2.6.12, < 4.4.286, >= 4.5 < 4.9.285, >= 4.10 < 4.14.249, >= 4.15 < 4.19.209, >= 4.20 < 5.4.151, >= 5.5 < 5.10.71, >= 5.11 < 5.14.10

Fixed versions

4.4.286, 4.9.285, 4.14.249, 4.19.209, 5.4.151, 5.10.71, 5.14.10

Technical data

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

CWE

CWE-125