CVE-2022-50097
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-06-18

Last updated on: 2025-11-19

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: video: fbdev: s3fb: Check the size of screen before memset_io() In the function s3fb_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: [ 54.083733] BUG: unable to handle page fault for address: ffffc90003000000 [ 54.083742] #PF: supervisor write access in kernel mode [ 54.083744] #PF: error_code(0x0002) - not-present page [ 54.083760] RIP: 0010:memset_orig+0x33/0xb0 [ 54.083782] Call Trace: [ 54.083788] s3fb_set_par+0x1ec6/0x4040 [ 54.083806] fb_set_var+0x604/0xeb0 [ 54.083836] do_fb_ioctl+0x234/0x670 Fix the this by checking the value of 'screen_size' before memset_io().
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Meta Information
Published
2025-06-18
Last Modified
2025-11-19
Generated
2026-05-07
AI Q&A
2025-06-18
EPSS Evaluated
2026-05-05
NVD
CVE-2022-50097
Affected Vendors & Products
Showing 7 associated CPEs
Vendor Product Version / Range
linux linux_kernel From 5.15.160 (inc) to 5.16 (inc)
linux linux_kernel From 5.15.160 (inc) to 5.16 (inc)
linux linux_kernel From 5.15.160 (inc) to 5.16 (inc)
linux linux_kernel From 5.15.160 (inc) to 5.16 (inc)
linux linux_kernel From 5.15.160 (inc) to 5.16 (inc)
linux linux_kernel From 5.15.160 (inc) to 5.16 (inc)
linux linux_kernel From 5.15.160 (inc) to 5.16 (inc)
Helpful Resources
Exploitability
CWE
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CWE ID Description
CWE-NVD-CWE-noinfo
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AI Powered Q&A
Can you explain this vulnerability to me?

This vulnerability exists in the Linux kernel's video subsystem, specifically in the fbdev s3fb driver. The function s3fb_set_par() calculates a 'screen_size' value based on user input. If a user provides an improper (too large) value for 'screen_size', it can exceed the actual allocated screen size ('info->screen_size'). This improper value can lead to a kernel bug, such as a page fault caused by writing outside the valid memory area during a memset_io() operation. The vulnerability is fixed by adding a check to ensure 'screen_size' does not exceed the valid limit before calling memset_io().


How can this vulnerability impact me? :

If exploited, this vulnerability can cause the Linux kernel to crash due to a page fault when handling video framebuffer operations. This can lead to system instability or denial of service. Since the issue arises from improper memory handling, it might also be leveraged to cause unexpected behavior in the kernel, potentially affecting system reliability.


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