CVE-2022-50101

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

HIGH

7.8

CVSS Score

Published: June 18, 2025 at 11:02 AM UTC

Updated: August 5, 2026 at 09:24 AM UTC

1 product affected across 1 vendorLinux Kernel

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Severity

HIGH7.8

Exploit prediction

EPSS 0.3%

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().

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel · Linux

95%

2.6.22 ≤ v < 4.14.2912.6.22 ≤ v < 4.19.2562.6.22 ≤ v < 5.10.1372.6.22 ≤ v < 5.15.612.6.22 ≤ v < 5.18.182.6.22 ≤ v < 5.19.22.6.22 ≤ v < 5.4.2112.6.22 ≤ v < 6.04.15 ≤ v < 4.19.2564.20 ≤ v < 5.4.2115.11 ≤ v < 5.15.615.16 ≤ v < 5.18.185.19 ≤ v < 5.19.25.5 ≤ v < 5.10.1372.6.22558b7bd86c32978648cda5deb5c758d77ef0c165

Vendor states this is fixed in 4a3cef1eaced13ba9b55381d46bfad937a3dac2c (fixed)

Vendor states this is fixed in 52ad9bfeb8a0e62de30de6d39e8a49a72dd78150 (fixed)

Vendor states this is fixed in 73280a184aa2e1a625ce54ce761042955cc79cd0 (fixed)

Vendor states this is fixed in b17caec5127bba6f90af92bcc85871df54548ac0 (fixed)

Vendor states this is fixed in bd8269e57621e5b38cc0b4bd2fa02e85c9f2a441 (fixed)

Vendor states this is fixed in c7a3f41e4b133d4dd25bc996b69039b19a34d69d (fixed)

Vendor states this is fixed in d71528ccdc7ae8d7500d414091d27805c51407a2 (fixed)

Vendor states this is fixed in ec0754c60217248fa77cc9005d66b2b55200ac06 (fixed)

Vendor states this is fixed in 2.6.22 (unaffected)

Vendor states this is fixed in 4.14.291 (unaffected)

Vendor states this is fixed in 4.19.256 (unaffected)

Vendor states this is fixed in 5.10.137 (unaffected)