SB2026050206 - Use of Uninitialized Variable in Linux kernel target driver

Description

This security bulletin contains information about 1 vulnerability.

1) Use of Uninitialized Variable (CVE-ID: CVE-2026-43055)

CWE-ID: CWE-457 - Use of Uninitialized Variable

CVSSv4: 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

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.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/01f784fc9d0ab2a6dac45ee443620e517cb2a19b
• https://git.kernel.org/stable/c/4eaff1728d0e69b95933412241bbccf4f797dba8
• https://git.kernel.org/stable/c/ce54802fe6bb78eb0feffc66fed6a45d41ffc3ab