Out-of-bounds read in Linux kernel - CVE-2026-53371

Vulnerability identifier: #VU138896

CSH Severity: Low

CVSS v4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-53371

CWE-ID: CWE-125

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to disclose sensitive information.

The vulnerability exists due to an out-of-bounds read in the ionic hca_type_show() sysfs handler when reading the node_desc sysfs attribute after a 64-byte value has been written without NUL termination. A local user can write an exactly 64-byte value and then read the sysfs file to disclose sensitive information.

The issue is triggerable from userspace because ionic supports IB_DEVICE_MODIFY_NODE_DESC.

Linux kernel
Ubuntu
linux-ibm (Ubuntu package)
linux-azure (Ubuntu package)
linux-aws (Ubuntu package)
linux-nvidia (Ubuntu package)
linux-nvidia-bos (Ubuntu package)

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
linux-ibm (Ubuntu package) - addressed in versions 7.0.0-1008.8, 7.0.0-1010.10
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
linux-nvidia (Ubuntu package) - addressed in versions 7.0.0-1016.16, 7.0.0-1016.16~24.04.1
linux-nvidia-bos (Ubuntu package) - update to 7.0.0-2016.16

• https://git.kernel.org/stable/c/61df14f306f153bffa2f3c74a94ff5a85c99fa39
• https://git.kernel.org/stable/c/654a27f25530d052eeedf086e6c3e2d585c203bd
• https://git.kernel.org/stable/c/a3e9372203afde2c62576356bb9a17890bc7fd6c

• Out-of-bounds read in Linux kernel hw ionic driver
• Ubuntu update for linux-ibm
• Ubuntu update for linux-azure
• Ubuntu update for linux-aws
• Ubuntu update for linux-nvidia-bos
• Ubuntu update for linux-nvidia