CVE-2022-50101

video: fbdev: vt8623fb: Check the size of screen before memset_io()

State: Published
Severity: 7.8 High
Published: Jun 18, 2025
Updated: Aug 5, 2026
Reserved: Jun 18, 2025

Description

In the Linux kernel, the following vulnerability has been resolved:

video: fbdev: vt8623fb: Check the size of screen before memset_io()

In the function vt8623fb_set_par(), the value of 'screen_size' is calculated by the user input. If the user provides the improper value, the value of 'screen_size' may larger than 'info->screen_size', which may cause the following bug:

[ 583.339036] BUG: unable to handle page fault for address: ffffc90005000000 [ 583.339049] #PF: supervisor write access in kernel mode [ 583.339052] #PF: error_code(0x0002) - not-present page [ 583.339074] RIP: 0010:memset_orig+0x33/0xb0 [ 583.339110] Call Trace: [ 583.339118] vt8623fb_set_par+0x11cd/0x21e0 [ 583.339146] fb_set_var+0x604/0xeb0 [ 583.339181] do_fb_ioctl+0x234/0x670 [ 583.339209] fb_ioctl+0xdd/0x130

Fix the this by checking the value of 'screen_size' before memset_io().

Scores

CVSS	Score	Vector	Source
3.1	7.8 High	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	Linux

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	558b7bd86c32978648cda5deb5c758d77ef0c165 to before 73280a184aa2e1a625ce54ce761042955cc79cd0Affected 558b7bd86c32978648cda5deb5c758d77ef0c165 to before 52ad9bfeb8a0e62de30de6d39e8a49a72dd78150Affected 558b7bd86c32978648cda5deb5c758d77ef0c165 to before d71528ccdc7ae8d7500d414091d27805c51407a2Affected 558b7bd86c32978648cda5deb5c758d77ef0c165 to before bd8269e57621e5b38cc0b4bd2fa02e85c9f2a441Affected 558b7bd86c32978648cda5deb5c758d77ef0c165 to before 4a3cef1eaced13ba9b55381d46bfad937a3dac2cAffected 558b7bd86c32978648cda5deb5c758d77ef0c165 to before b17caec5127bba6f90af92bcc85871df54548ac0Affected 558b7bd86c32978648cda5deb5c758d77ef0c165 to before c7a3f41e4b133d4dd25bc996b69039b19a34d69dAffected 558b7bd86c32978648cda5deb5c758d77ef0c165 to before ec0754c60217248fa77cc9005d66b2b55200ac06Affected
LinuxLinux	2.6.22Affected before 2.6.22Not affected 4.14.291 through 4.14.Not affected 4.19.256 through 4.19.Not affected 5.4.211 through 5.4.Not affected 5.10.137 through 5.10.Not affected 5.15.61 through 5.15.Not affected 5.18.18 through 5.18.Not affected 5.19.2 through 5.19.*Not affected 6.0 and laterNot affected

Product

Versions

LinuxLinux

558b7bd86c32978648cda5deb5c758d77ef0c165 to before 73280a184aa2e1a625ce54ce761042955cc79cd0Affected
558b7bd86c32978648cda5deb5c758d77ef0c165 to before 52ad9bfeb8a0e62de30de6d39e8a49a72dd78150Affected
558b7bd86c32978648cda5deb5c758d77ef0c165 to before d71528ccdc7ae8d7500d414091d27805c51407a2Affected
558b7bd86c32978648cda5deb5c758d77ef0c165 to before bd8269e57621e5b38cc0b4bd2fa02e85c9f2a441Affected
558b7bd86c32978648cda5deb5c758d77ef0c165 to before 4a3cef1eaced13ba9b55381d46bfad937a3dac2cAffected
558b7bd86c32978648cda5deb5c758d77ef0c165 to before b17caec5127bba6f90af92bcc85871df54548ac0Affected
558b7bd86c32978648cda5deb5c758d77ef0c165 to before c7a3f41e4b133d4dd25bc996b69039b19a34d69dAffected
558b7bd86c32978648cda5deb5c758d77ef0c165 to before ec0754c60217248fa77cc9005d66b2b55200ac06Affected

LinuxLinux

2.6.22Affected
before 2.6.22Not affected
4.14.291 through 4.14.*Not affected
4.19.256 through 4.19.*Not affected
5.4.211 through 5.4.*Not affected
5.10.137 through 5.10.*Not affected
5.15.61 through 5.15.*Not affected
5.18.18 through 5.18.*Not affected
5.19.2 through 5.19.*Not affected
6.0 and laterNot affected

References

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