Use of Uninitialized Variable in Linux kernel - CVE-2026-43055
Published: May 2, 2026
Vulnerability identifier: #VU128855
CSH Severity: Low
CVSS v4.0: 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/E:U/U:Clear
CVE-ID: CVE-2026-43055
CWE-ID: CWE-457
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to use of uninitialized memory in aio_cmd->iocb in target_core_file when executing asynchronous write commands. A local user can trigger a write operation to cause a denial of service.
The issue can result in unintended write failure status because a bogus ki_write_stream value may be checked against the block device write stream limit.
How to mitigate CVE-2026-43055
Install security update from vendor's repository.