Improper access control in Linux kernel - CVE-2026-46148

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Main Vulnerability Database Vulnerabilities #VU133045

Improper access control in Linux kernel - CVE-2026-46148

Published: May 29, 2026


Vulnerability identifier: #VU133045
CSH Severity: Low
CVSS v4: 4.8 [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]
CVE-ID: CVE-2026-46148
CWE-ID: CWE-284
Exploitation vector: Local access
Exploit availability: No public exploit available

Vulnerability details

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.


Affected software

Linux kernel
Debian Linux
Ubuntu
linux (Ubuntu package)
linux-realtime (Ubuntu package)
linux-aws (Ubuntu package)
linux-gcp (Ubuntu package)
linux-oracle (Ubuntu package)
linux-raspi (Ubuntu package)
linux-azure (Ubuntu package)
linux-nvidia (Ubuntu package)
linux-ibm (Ubuntu package)
linux-nvidia-bos (Ubuntu package)
linux-azure-7.0 (Ubuntu package)
linux-gcp-7.0 (Ubuntu package)
linux-oracle-7.0 (Ubuntu package)
linux-oem-7.0 (Ubuntu package)
linux-gke (Ubuntu package)
linux-azure-fde (Ubuntu package)
linux-nvidia-7.0 (Ubuntu package)
linux (Debian package)

How to mitigate CVE-2026-46148

Install security update from vendor's repository.

linux (Ubuntu package) - update to 7.0.0-28.28
linux-realtime (Ubuntu package) - update to 7.0.0-28.28.1
linux-aws (Ubuntu package) - update to 7.0.0-1009.9
linux-gcp (Ubuntu package) - update to 7.0.0-1008.8
linux-oracle (Ubuntu package) - update to 7.0.0-1008.8
linux-raspi (Ubuntu package) - update to 7.0.0-1015.15
linux-azure (Ubuntu package) - update to 7.0.0-1010.10
linux-nvidia (Ubuntu package) - update to 7.0.0-1016.16
linux-ibm (Ubuntu package) - update to 7.0.0-1010.10
linux-nvidia-bos (Ubuntu package) - update to 7.0.0-2016.16
linux-azure-7.0 (Ubuntu package) - update to 7.0.0-1014.14~24.04.1
linux-gcp-7.0 (Ubuntu package) - update to 7.0.0-1011.11~24.04.1
linux-oracle-7.0 (Ubuntu package) - update to 7.0.0-1011.11~24.04.1
linux-oem-7.0 (Ubuntu package) - update to 7.0.0-1009.9
linux-gke (Ubuntu package) - update to 7.0.0-1003.4
linux-azure-fde (Ubuntu package) - update to 7.0.0-1009.9
linux-nvidia-7.0 (Ubuntu package) - update to 7.0.0-1016.16~24.04.1
linux (Debian package) - update to 6.12.115-2

External References

Related Security Bulletins