Improper Initialization in Linux kernel - CVE-2026-74617

Vulnerability identifier: #VU144946

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-2026-74617

CWE-ID: CWE-665

Exploitation vector: Local access

Exploit availability: No public exploit available

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

The vulnerability exists due to improper initialization in the dibs interrupt handling path when handling GID event interrupts before device registration is fully completed. A local attacker can trigger an interrupt on a device with an uninitialized lock to cause a denial of service.

The issue occurs because the interrupt handler may access dibs->lock before dibs_dev_add() is called.

Linux kernel
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)

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
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

• https://git.kernel.org/stable/c/2926031acba100d0c18fcfaa7a2ed29609318848
• https://git.kernel.org/stable/c/c27e360545373b7aee9862a5beef3b9fb3df0c25
• https://git.kernel.org/stable/c/fe79571f40434b257d68cbfb7b3ae93a794d8a11

• Improper Initialization in Linux kernel dibs interrupt handling path
• Ubuntu update for linux-oem-7.0
• Ubuntu update for linux, linux-aws, linux-gcp and more