Improper input validation in Linux kernel - CVE-2026-46105

Vulnerability identifier: #VU133089

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-2026-46105

CWE-ID: CWE-20

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 input validation in the mpt3sas NVMe I/O handling logic when processing oversized NVMe I/O requests. A local user can trigger oversized I/O operations to cause a denial of service.

The issue can lead to a kernel oops because the driver uses a fixed 4K PRP list buffer that supports at most 512 entries, limiting transfers to 2 MiB.

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/04631f55afc543d5431a2bdee7f6cc0f2c0debe7
• https://git.kernel.org/stable/c/45dcc815fc5539e88154315f36cbcb11d3a52fc2
• https://git.kernel.org/stable/c/e5f9824817c6358b9f9738bdb92dec9e4e794d3c

• Improper input validation in Linux kernel scsi mpt3sas 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