Bug 2108691 (CVE-2021-33655) - CVE-2021-33655 kernel: sending malicous data to kernel by ioctl FBIOPUT_VSCREENINFO may cause out of bounds write memory
Summary: CVE-2021-33655 kernel: sending malicous data to kernel by ioctl FBIOPUT_VSCRE...
Keywords:
Status: NEW
Alias: CVE-2021-33655
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 2109116 2109117 2109118 2109119 2109115
Blocks: 2108340
TreeView+ depends on / blocked
 
Reported: 2022-07-19 17:29 UTC by Alex
Modified: 2022-08-23 18:31 UTC (History)
50 users (show)

Fixed In Version: kernel 5.18 rc11
Doc Type: If docs needed, set a value
Doc Text:
An out-of-bounds write flaw was found in the Linux kernel’s framebuffer-based console driver functionality in the way a user triggers ioctl FBIOPUT_VSCREENINFO with malicious data. This flaw allows a local user to crash or potentially escalate their privileges on the system.
Clone Of:
Environment:
Last Closed:


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Description Alex 2022-07-19 17:29:10 UTC
A flaw in the Linux Kernel framebuffer-based console driver found. When sending malicious data to kernel by ioctl FBIOPUT_VSCREENINFO, kernel will write memory out of bounds. To trigger the vulnerability user need to have access to console driver like /dev/fb0.

Reference:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=086ff84617185393a0bbf25830c4f36412a7d3f4

Comment 2 Alex 2022-07-20 12:49:27 UTC
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 2109115]

Comment 7 Justin M. Forbes 2022-07-22 18:33:31 UTC
This was fixed for Fedora with the 5.18.11 stable kernel updates.


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