Memory leak in Linux kernel - CVE-2026-90175

Vulnerability identifier: #VU151306

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-2026-90175

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 the KSMBD authentication and user-configuration handlers when processing KSMBD login requests. A local user can trigger KSMBD login processing to cause a denial of service.

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/1c3ebf832d010c08afe1359215d4121cb1ed2de5
• https://git.kernel.org/stable/c/4d6fe49fa3e7fbd779c761518e6572e340233c9b
• https://git.kernel.org/stable/c/7a98c3b903b10c4d6176948254012b5ca24b071b
• https://git.kernel.org/stable/c/abb5146b2d8197d695ea9eaa0847c73e34f00985
• https://git.kernel.org/stable/c/c9f2872e91b9fe99c1d0ba768906f7aeb48c8517

• Memory leak in Linux kernel server mgmt
• Debian update for linux
• Ubuntu update for linux-oem-7.0
• Ubuntu update for linux, linux-aws, linux-gcp and more