Improper input validation in Linux kernel - CVE-2026-90323
Published: September 18, 2026
Vulnerability identifier: #VU151158
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-2026-90323
CWE-ID: CWE-20
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to improper input validation in the UBLK io_uring command handling when processing automatic buffer registration data from a submission queue entry. A local user can submit an io_uring command with invalid automatic buffer registration data to cause a teardown hang.
Affected software
Linux kernel
How to mitigate CVE-2026-90323
Install security update from vendor's repository.