Out-of-bounds read in Linux kernel - CVE-2026-98495

Vulnerability identifier: #VU156795

CSH Severity: Low

CVSS v4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-98495

CWE-ID: CWE-125

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to trigger an out-of-bounds read of kernel stack memory, potentially causing a denial of service.

The vulnerability exists due to missing NUL termination of the arp_dev field in the Linux kernel ARP ioctl handler when looking up a user-supplied interface name. A local user can submit a struct arpreq containing IFNAMSIZ bytes without a NUL terminator in arp_dev to cause strcmp() to read beyond the stack object during lookup through dev_get_by_name_rcu() or __dev_get_by_name() when a matching alternative interface name exists.

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/1b08c5c3ac27c9ff91c5309f4a32b4e91ce2263b
• https://git.kernel.org/stable/c/35e716a70733472ede300540082d64c33bf3b4c9
• https://git.kernel.org/stable/c/414bbad9928598904313299ac9e037a73f520be1
• https://git.kernel.org/stable/c/47107491b48ceef0a2faa7a010cfa961f211ef9f
• https://git.kernel.org/stable/c/7389757d88f54237951d7497d9c4dae7cc6d64be
• https://git.kernel.org/stable/c/ae6d704dbf9542b0a0830ec91a2db4f30307e7d8
• https://git.kernel.org/stable/c/ba664d83638640cf454b65167339cbf20dfd6f10
• https://git.kernel.org/stable/c/d8b6529e80bcb4fb8177121404cbb3377acaebd2

• Out-of-bounds read in Linux kernel ipv4
• 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