CVE - CVE-2021-47383

CVE-ID
CVE-2021-47383	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
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.
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MISC:https://git.kernel.org/stable/c/067c694d06040db6f0c65281bb358452ca6d85b9 URL:https://git.kernel.org/stable/c/067c694d06040db6f0c65281bb358452ca6d85b9 MISC:https://git.kernel.org/stable/c/3b0c406124719b625b1aba431659f5cdc24a982c URL:https://git.kernel.org/stable/c/3b0c406124719b625b1aba431659f5cdc24a982c MISC:https://git.kernel.org/stable/c/699d926585daa6ec44be556cdc1ab89e5d54557b URL:https://git.kernel.org/stable/c/699d926585daa6ec44be556cdc1ab89e5d54557b MISC:https://git.kernel.org/stable/c/70aed03b1d5a5df974f456cdc8eedb213c94bb8b URL:https://git.kernel.org/stable/c/70aed03b1d5a5df974f456cdc8eedb213c94bb8b MISC:https://git.kernel.org/stable/c/7e71fcedfda6f7de18f850a6b36e78d78b04476f URL:https://git.kernel.org/stable/c/7e71fcedfda6f7de18f850a6b36e78d78b04476f MISC:https://git.kernel.org/stable/c/883f7897a25e3ce14a7f274ca4c73f49ac84002a URL:https://git.kernel.org/stable/c/883f7897a25e3ce14a7f274ca4c73f49ac84002a MISC:https://git.kernel.org/stable/c/8a6a240f52e14356386030d8958ae8b1761d2325 URL:https://git.kernel.org/stable/c/8a6a240f52e14356386030d8958ae8b1761d2325 MISC:https://git.kernel.org/stable/c/d570c48dd37dbe8fc6875d4461d01a9554ae2560 URL:https://git.kernel.org/stable/c/d570c48dd37dbe8fc6875d4461d01a9554ae2560
Assigning CNA
kernel.org
Date Record Created
20240521	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20240521)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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