Numeric Truncation Error in Linux kernel - CVE-2026-89450

Vulnerability identifier: #VU149361

CSH Severity: Low

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

CVE-ID: CVE-2026-89450

CWE-ID: CWE-197

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local privileged user to cause stream ID aliasing.

The vulnerability exists due to improper validation of virtual stream ID width in the tegra241-cmdqv virtual interface SID_MATCH register programming when configuring a guest-provided virtual stream ID. A local privileged user can supply a virtual stream ID exceeding the SID_MATCH field width to cause stream ID aliasing.

The hardware matches only a 20-bit stream ID.

Linux kernel
Ubuntu
linux (Ubuntu package)
linux-aws (Ubuntu package)
linux-gcp (Ubuntu package)
linux-oracle (Ubuntu package)
linux-ibm (Ubuntu package)
linux-hwe-7.0 (Ubuntu package)
linux-oem-7.0 (Ubuntu package)

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
linux (Ubuntu package) - update to 7.0.0-42.42
linux-aws (Ubuntu package) - update to 7.0.0-1016.17
linux-gcp (Ubuntu package) - update to 7.0.0-1016.18
linux-oracle (Ubuntu package) - update to 7.0.0-1015.16
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

• https://git.kernel.org/stable/c/4379610c79bd88ddbea10e7f6c21e16d4b338c6b
• https://git.kernel.org/stable/c/445204550f894ca325ac80a21e3df177ad073798
• https://git.kernel.org/stable/c/d903d99ffd22b0180bd745a43f221c21bcdd8d7c

• Numeric Truncation Error in Linux kernel arm arm-smmu-v3 driver
• Ubuntu update for linux-oem-7.0
• Ubuntu update for linux, linux-aws, linux-gcp and more