Out-of-bounds write in Linux kernel - CVE-2026-98889

Vulnerability identifier: #VU157623

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-2026-98889

CWE-ID: CWE-787

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to corrupt kernel memory, potentially causing a denial of service.

The vulnerability exists due to an out-of-bounds write in the iwlwifi MVM driver's scheduled scan handling when building probe requests before validating information element lengths. A local user can supply oversized information elements for a scheduled scan to overflow the fixed-size probe request buffer, potentially causing a kernel crash.

Linux kernel
Ubuntu
linux-nvidia-tegra (Ubuntu package)
linux-nvidia-tegra-igx (Ubuntu package)
linux-nvidia-tegra-5.15 (Ubuntu package)
linux (Ubuntu package)
linux-gcp (Ubuntu package)
linux-oracle (Ubuntu package)
linux-aws (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-nvidia-tegra (Ubuntu package) - update to 5.15.0-1070.72
linux-nvidia-tegra-igx (Ubuntu package) - update to 5.15.0-1059.59
linux-nvidia-tegra-5.15 (Ubuntu package) - update to 5.15.0-1070.72~20.04.1
linux (Ubuntu package) - update to 7.0.0-42.42
linux-gcp (Ubuntu package) - update to 7.0.0-1016.18
linux-oracle (Ubuntu package) - update to 7.0.0-1015.16
linux-aws (Ubuntu package) - update to 7.0.0-1016.17
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/05f79cea3b15cfe600b205ddcfd51ebee15d908a
• https://git.kernel.org/stable/c/0a63f98e5163a2ec2822dfb691ee5a6094de08ec
• https://git.kernel.org/stable/c/358eca9a898ad4cce7453e9dcfd005d019a2b01f
• https://git.kernel.org/stable/c/4f155d262b31b9b17e0f9856bdabe0968eb4930f
• https://git.kernel.org/stable/c/a24417478f90e9f1a4ea24cd4b784afccb56fbae
• https://git.kernel.org/stable/c/f2268060e99f94314b9988dfa17393c2694fa9b2

• Out-of-bounds write in Linux kernel iwlwifi mvm driver
• Ubuntu update for linux-oem-7.0
• Ubuntu update for linux, linux-aws, linux-gcp and more
• Ubuntu update for linux-nvidia-tegra, linux-nvidia-tegra-5.15, linux-nvidia-tegra-igx
• Ubuntu update for linux, linux-aws, linux-aws-5.15 and more