# CVE-2026-99214: Linux kernel drm/vc4 HDMI information frame crash

Source: https://junglewise.ai/threats/cve-2026-99214-in-the-linux-kernel-the-following-vulnerability-has-been-resolved  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-28. Updated: 2026-10-28  
License: CC BY 4.0 with a link back

CVE-2026-99214 · Severity: info · Published 2026-10-28

A race condition in the Linux kernel's video driver for Raspberry Pi HDMI audio can cause the system to issue a warning and fail to process audio information frames. When audio starts before the video display is fully restored, the hardware memory needed to store audio metadata is disabled, preventing the audio from being configured properly.

Technologies: [Linux Kernel](https://junglewise.ai/threats/technologies/kernel). Vendors: [Linux](https://junglewise.ai/threats/vendors/linux).

## Quick answers

**Is CVE-2026-99214 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-99214 being exploited in the wild.

**How severe is CVE-2026-99214?** Informational severity, published 28 October 2026.

**Which products and versions are affected?** Linux Kernel prior to fix.

**Is there a fix for CVE-2026-99214?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-99214 attacked?** It is attacked with local access, in an operating system.

**Am I affected by CVE-2026-99214?** Check whether you run Linux Kernel at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The vulnerability is a race condition in vc4_hdmi_write_infoframe() where audio triggered by HPD handler execution can occur before vc4_hdmi_encoder_post_crtc_enable() has been called, leaving Packet RAM disabled when audio infoframe writes are attempted. An attacker with local access triggering display hot-plug events during audio playback could trigger a kernel warning and denial of service. The fix moves Packet RAM enable/disable to PM runtime hooks to ensure it remains available during audio operations.

## Affected products

- Linux Linux kernel prior to fix

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