SB2026091930 - NULL pointer dereference in Linux kernel mailbox driver
Published: September 19, 2026
Security Bulletin ID
SB2026091930
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) NULL pointer dereference (CVE-ID: CVE-2026-90192)
CWE-ID: CWE-476 - NULL Pointer Dereference
CVSSv4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to a null pointer dereference in the qcom_cpucp_mbox_send_data callback when handling a channel-clear notification with null data. A local user can trigger a channel-clear notification to cause a denial of service.
The issue occurs under PREEMPT_RT.
Remediation
Install update from vendor's website.