NULL pointer dereference in Linux kernel - CVE-2026-90192

Vulnerability identifier: #VU151298

CSH Severity: Low

CVSS v4: 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]

CVE-ID: CVE-2026-90192

CWE-ID: CWE-476

Exploitation vector: Local access

Exploit availability: No public exploit available

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.

Linux kernel
Debian Linux
Ubuntu
linux (Ubuntu package)
linux-aws (Ubuntu package)
linux-gcp (Ubuntu package)
linux-oracle (Ubuntu package)
linux-ibm (Ubuntu package)
linux-hwe-7.0 (Ubuntu package)
linux-oem-7.0 (Ubuntu package)
linux (Debian package)

Install security update from vendor's repository.

linux (Ubuntu package) - update to 7.0.0-42.42
linux-aws (Ubuntu package) - update to 7.0.0-1016.17
linux-gcp (Ubuntu package) - update to 7.0.0-1016.18
linux-oracle (Ubuntu package) - update to 7.0.0-1015.16
linux-ibm (Ubuntu package) - update to 7.0.0-1017.17
linux-hwe-7.0 (Ubuntu package) - update to 7.0.0-42.42~24.04.1
linux-oem-7.0 (Ubuntu package) - update to 7.0.0-1017.17
linux (Debian package) - update to 6.12.111-1

• https://git.kernel.org/stable/c/3d11d2a6c9a10de287e0f1b53a5e65d16afe2760
• https://git.kernel.org/stable/c/413b0b94d6d06b8d49735280e86a01dac90cf177
• https://git.kernel.org/stable/c/b3d73e7440e0c40644285be1bda349cdf90122d8
• https://git.kernel.org/stable/c/fc4f2f99530298a1739226947aa76525142d421d

• NULL pointer dereference in Linux kernel mailbox driver
• Debian update for linux
• Ubuntu update for linux-oem-7.0
• Ubuntu update for linux, linux-aws, linux-gcp and more