vulnerability
Ubuntu: (CVE-2022-50101): linux vulnerability
| Severity | CVSS | Published | Added | Modified |
|---|---|---|---|---|
| 7 | (AV:L/AC:L/Au:S/C:C/I:C/A:C) | Jun 18, 2025 | Jun 26, 2025 | Nov 20, 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().
Solutions
References
- CVE-2022-50101
- https://attackerkb.com/topics/CVE-2022-50101
- URL-https://git.kernel.org/stable/c/4a3cef1eaced13ba9b55381d46bfad937a3dac2c
- URL-https://git.kernel.org/stable/c/52ad9bfeb8a0e62de30de6d39e8a49a72dd78150
- URL-https://git.kernel.org/stable/c/73280a184aa2e1a625ce54ce761042955cc79cd0
- URL-https://git.kernel.org/stable/c/b17caec5127bba6f90af92bcc85871df54548ac0
- URL-https://git.kernel.org/stable/c/bd8269e57621e5b38cc0b4bd2fa02e85c9f2a441
- URL-https://git.kernel.org/stable/c/c7a3f41e4b133d4dd25bc996b69039b19a34d69d
- URL-https://git.kernel.org/stable/c/d71528ccdc7ae8d7500d414091d27805c51407a2
- URL-https://git.kernel.org/stable/c/ec0754c60217248fa77cc9005d66b2b55200ac06
- URL-https://www.cve.org/CVERecord?id=CVE-2022-50101
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