Always-Incorrect Control Flow Implementation in Linux kernel - CVE-2026-46192

Vulnerability identifier: #VU133008

CSH Severity: Low

CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-46192

CWE-ID: CWE-670

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 improper state management in microchip-core-qspi when handling emulated read-only dual/quad operations. A local user can trigger a crafted QSPI read operation to cause a denial of service.

The issue can brick the transfer because the driver attempts to transmit garbage data during read handling.

Linux kernel
Ubuntu
linux (Ubuntu package)
linux-ibm (Ubuntu package)
linux-oem-7.0 (Ubuntu package)
linux-azure (Ubuntu package)
linux-aws (Ubuntu package)

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
linux (Ubuntu package) - addressed in versions 7.0.0-28.28, 7.0.0-28.28.1, 7.0.0-1003.4, 7.0.0-1008.8
linux-ibm (Ubuntu package) - addressed in versions 7.0.0-1008.8, 7.0.0-1010.10
linux-oem-7.0 (Ubuntu package) - update to 7.0.0-1009.9
linux-azure (Ubuntu package) - addressed in versions 7.0.0-1009.9, 7.0.0-1010.10
linux-aws (Ubuntu package) - addressed in versions 7.0.0-1009.9, 7.0.0-1015.15

• https://git.kernel.org/stable/c/67184f361ab4d9fac6d2b8d5fed6649d496038a4
• https://git.kernel.org/stable/c/eb56deaabf127e8985fc91fa6c97bf8a3b062844
• https://git.kernel.org/stable/c/ec9d0ddbde6003c303fa5e1d5cd48952852984d8

• Always-Incorrect Control Flow Implementation in Linux kernel spi driver
• Ubuntu update for linux-oem-7.0
• Ubuntu update for linux
• Ubuntu update for linux-ibm
• Ubuntu update for linux-azure
• Ubuntu update for linux-aws