SB20260919115 - Improper Enforcement of Behavioral Workflow in Linux kernel fuse
Published: September 19, 2026
Security Bulletin ID
SB20260919115
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Partial DoS
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Improper Enforcement of Behavioral Workflow (CVE-ID: CVE-2026-90095)
CWE-ID: CWE-841 - Improper Enforcement of Behavioral Workflow
CVSSv4: 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]
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.
Remediation
Install update from vendor's website.