Improper Check or Handling of Exceptional Conditions in Linux kernel - CVE-2026-89456
Published: September 12, 2026
Vulnerability identifier: #VU149352
CSH Severity: Low
CVSS v4: 0 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-89456
CWE-ID: CWE-703
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to receive zeroed data for unread portions of a request.
The vulnerability exists due to improper handling of partial-completion length in dasd_default_erp_postaction() when recovering a partially completed ESE read through the ERP chain. A local user can issue a read request that is partially completed and recovered through the ERP chain to receive zeroed data for unread portions of a request.
Affected software
Linux kernel
How to mitigate CVE-2026-89456
Install security update from vendor's repository.