Improper Enforcement of Behavioral Workflow in Linux kernel - CVE-2026-90095

Vulnerability identifier: #VU151383

CSH Severity: Low

CVSS v4: 2 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-90095

CWE-ID: CWE-841

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 state validation in fuse_uring_cmd() when processing IORING_OP_URING_CMD requests on a FUSE connection that did not negotiate FUSE_OVER_IO_URING while I/O is active. A local user can issue an IORING_OP_URING_CMD request to cause a deadlock.

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 (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/1f59015e958174e89be58cc8db16d70a60d17255
• https://git.kernel.org/stable/c/8f9a725d89711ad027f6b7183586ef91528f106d

• Improper Enforcement of Behavioral Workflow in Linux kernel fuse
• Ubuntu update for linux-oem-7.0
• Ubuntu update for linux, linux-aws, linux-gcp and more