Integer overflow in Linux kernel - CVE-2026-89825

Vulnerability identifier: #VU150454

CSH Severity: Low

CVSS v4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-89825

CWE-ID: CWE-190

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to compromise confidentiality, integrity, and availability.

The vulnerability exists due to integer overflow in the Panthor firmware control interface initialization routines when calculating control-interface offsets from firmware-provided strides. A local user can cause offset calculations to wrap and map invalid firmware control interfaces to compromise confidentiality, integrity, and availability.

Linux kernel
Debian Linux
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)
linux (Debian package)

Install security update from vendor's repository.

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
linux (Debian package) - update to 6.12.111-1

• https://git.kernel.org/stable/c/33ae55809aee9b4dca1d00cdee35b527f2bf8626
• https://git.kernel.org/stable/c/3e5c7cddc0073eef6f9bb373189b11a969f1f6f6
• https://git.kernel.org/stable/c/6a47f9fd2d970674ed9dedc52fc7ab76fd015785
• https://git.kernel.org/stable/c/80c9528661c774f899281c9a72011208ff39929e

• Integer overflow in Linux kernel drm panthor driver
• Debian update for linux
• Ubuntu update for linux-oem-7.0
• Ubuntu update for linux, linux-aws, linux-gcp and more