Memory leak in Linux kernel - CVE-2026-89975

Vulnerability identifier: #VU150309

CSH Severity: Low

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

CVE-ID: CVE-2026-89975

CWE-ID: CWE-401

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to improper memory release in nvmf_parse_options() when parsing malformed DH-CHAP secret options written to /dev/nvme-fabrics. A local user can repeatedly submit malformed dhchap_secret or dhchap_ctrl_secret values to cause a denial of service.

Only systems with CONFIG_NVME_HOST_AUTH enabled are affected. No NVMe-oF target or working transport connection is required.

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/15d7a35a489287109b5a7c157d53d9b8214f0318
• https://git.kernel.org/stable/c/702c1ae0d31b44828ec3c87079def490c1ee1fb3
• https://git.kernel.org/stable/c/afdee49a1b88ed9bb44e2b30e855297c169bcc53
• https://git.kernel.org/stable/c/d21da6cc91ba1c4f1ae5ba007f3cb89e1c0c7549

• Memory leak in Linux kernel nvme host driver
• Debian update for linux
• Ubuntu update for linux-oem-7.0
• Ubuntu update for linux, linux-aws, linux-gcp and more