Unchecked Return Value in Linux kernel - CVE-2026-89458
Published: September 12, 2026
Vulnerability identifier: #VU149354
CSH Severity: Low
CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-89458
CWE-ID: CWE-252
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to disclose sensitive information.
The vulnerability exists due to an unchecked return value in dasd_int_handler when handling an NRF read of an unallocated ESE track. A local user can trigger a failed ESE read that is completed successfully to disclose sensitive information.
A failed sense-data parse or a current track outside the requested range can leave destination pages untouched.
Affected software
Linux kernel
How to mitigate CVE-2026-89458
Install security update from vendor's repository.