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National Vulnerability Database

National Vulnerability Database

NVD

National Vulnerability Database
  1. Vulnerabilities

CVE-2021-47383 Detail

Description

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 of y, and that value, eventually, causes the imageblit to access an out-of-bound address value. To solve this issue I made the resize_screen() be called even if the screen does not need any resizing, so it will "fix and fill" the fb_var_screeninfo independently.


Metrics

 
NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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URL Source(s) Tag(s)
https://git.kernel.org/stable/c/067c694d06040db6f0c65281bb358452ca6d85b9 CVE, kernel.org
https://git.kernel.org/stable/c/3b0c406124719b625b1aba431659f5cdc24a982c CVE, kernel.org
https://git.kernel.org/stable/c/699d926585daa6ec44be556cdc1ab89e5d54557b CVE, kernel.org
https://git.kernel.org/stable/c/70aed03b1d5a5df974f456cdc8eedb213c94bb8b CVE, kernel.org
https://git.kernel.org/stable/c/7e71fcedfda6f7de18f850a6b36e78d78b04476f CVE, kernel.org
https://git.kernel.org/stable/c/883f7897a25e3ce14a7f274ca4c73f49ac84002a CVE, kernel.org
https://git.kernel.org/stable/c/8a6a240f52e14356386030d8958ae8b1761d2325 CVE, kernel.org
https://git.kernel.org/stable/c/d570c48dd37dbe8fc6875d4461d01a9554ae2560 CVE, kernel.org

Weakness Enumeration

CWE-ID CWE Name Source

Change History

3 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2021-47383
NVD Published Date:
05/21/2024
NVD Last Modified:
11/21/2024
Source:
kernel.org