SB20260529149 - Improper access control in Linux kernel spi driver

Description

This security bulletin contains information about 1 vulnerability.

1) Improper access control (CVE-ID: CVE-2026-46148)

CWE-ID: CWE-284 - Improper Access Control

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear

The vulnerability allows a local user to interfere with SPI communications.

The vulnerability exists due to improper access control in the microchip-core-qspi driver when handling chip select lines for transfers involving multiple SPI devices. A local user can trigger access to a device attached via GPIO chip select while the built-in chip select is incorrectly asserted to interfere with SPI communications.

The issue occurs when multiple devices are attached to the QSPI controller and the built-in chip select is used alongside GPIO-based chip selects.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/7672749e1496215e8683ce57cf323119033954cf
• https://git.kernel.org/stable/c/998f43196d732f20f9b71eb6ebd973736c9fa911
• https://git.kernel.org/stable/c/ee3c99aa102212ad59dc2c19595515c4a6729307