Unchecked Return Value in Linux kernel - CVE-2026-90324
Published: September 18, 2026
Vulnerability identifier: #VU151159
CSH Severity: Low
CVSS v4: 0 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-90324
CWE-ID: CWE-252
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to trigger I/O processing with an uninitialized iov_iter.
The vulnerability exists due to an unchecked return value in the ublk_map_io and ublk_unmap_io functions when processing an I/O buffer address supplied by a userspace ublk server. A local user can operate a userspace ublk server and provide an address range outside the allowed user address space to trigger I/O processing with an uninitialized iov_iter.
Affected software
Linux kernel
How to mitigate CVE-2026-90324
Install security update from vendor's repository.