Incorrect Bitwise Shift of Integer in Linux kernel - CVE-2026-90386

Vulnerability identifier: #VU151109

CSH Severity: Low

CVSS v4: 0 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-90386

CWE-ID: CWE-1335

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to trigger a shift-out-of-bounds condition.

The vulnerability exists due to an incorrect bitwise shift calculation in the DesignWare I3C master DAA handler when ENTDAA assigns no devices on an empty I3C bus. A local user can initiate dynamic address assignment on an empty I3C bus to trigger a shift-out-of-bounds condition.

Linux kernel
Debian Linux
Ubuntu
linux-nvidia-tegra-igx (Ubuntu package)
linux-nvidia-tegra (Ubuntu package)
linux-nvidia-tegra-5.15 (Ubuntu package)
linux-azure-fde (Ubuntu package)
linux (Ubuntu package)
linux-oracle (Ubuntu package)
linux-gcp (Ubuntu package)
linux-aws (Ubuntu package)
linux-ibm (Ubuntu package)
linux-hwe-7.0 (Ubuntu package)
linux-oem-7.0 (Ubuntu package)
linux (Debian package)
linux-nvidia-bos (Ubuntu package)

Install security update from vendor's repository.

linux-nvidia-tegra-igx (Ubuntu package) - update to 5.15.0-1059.59
linux-nvidia-tegra (Ubuntu package) - update to 5.15.0-1070.72
linux-nvidia-tegra-5.15 (Ubuntu package) - update to 5.15.0-1070.72~20.04.1
linux-azure-fde (Ubuntu package) - update to 5.15.0-1124.133
linux (Ubuntu package) - update to 7.0.0-42.42
linux-oracle (Ubuntu package) - update to 7.0.0-1015.16
linux-gcp (Ubuntu package) - update to 7.0.0-1016.18
linux-aws (Ubuntu package) - update to 7.0.0-1016.17
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
linux-nvidia-bos (Ubuntu package) - update to 7.0.0-2018.18

• https://git.kernel.org/stable/c/038cf48b3170af26a70bf2dee4f8c3ac910f5176
• https://git.kernel.org/stable/c/111f559e5b6461f5f6977275716e6c5d1eb7ea27
• https://git.kernel.org/stable/c/3a1c35739efb69e8ec2a868113a0471a01bb8f29
• https://git.kernel.org/stable/c/5650b013e6bfc14c8b30be727f4a715b01860a08
• https://git.kernel.org/stable/c/618dd640ded6b94bbdb79c798a901ec564797033
• https://git.kernel.org/stable/c/63110ccc434e10d9e9d2c7d82ebfa8a6f9cedd94
• https://git.kernel.org/stable/c/754533e6169d1f10bdef7a6ba9bd7740b524e1d4
• https://git.kernel.org/stable/c/9eaac0cb4ca94e2e32c53c156ae5b813ba7ef90c

• Incorrect Bitwise Shift of Integer in Linux kernel i3c master driver
• Ubuntu update for linux-nvidia-bos
• Debian update for linux
• Ubuntu update for linux-azure-fde
• Ubuntu update for linux-oem-7.0
• Ubuntu update for linux, linux-aws, linux-gcp and more
• Ubuntu update for linux-nvidia-tegra, linux-nvidia-tegra-5.15, linux-nvidia-tegra-igx
• Ubuntu update for linux, linux-aws, linux-aws-5.15 and more