SB2026102969 - Incorrect behavior order in Linux kernel drm vc4 driver
Published: October 29, 2026
Security Bulletin ID
SB2026102969
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Partial DoS
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Incorrect behavior order (CVE-ID: CVE-2026-99214)
CWE-ID: CWE-696 - Incorrect Behavior Order
CVSSv4: 2 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
The vulnerability allows a local user to trigger a kernel warning during HDMI audio preparation.
The vulnerability exists due to incorrect ordering of Packet RAM initialization in the Linux kernel VC4 HDMI driver when preparing audio before video has been restored. A local user can initiate HDMI audio preparation while Packet RAM is disabled to trigger a kernel warning in vc4_hdmi_write_infoframe().
Remediation
Install update from vendor's website.