Improper Check or Handling of Exceptional Conditions in Linux kernel - CVE-2026-89830
Published: September 17, 2026
Vulnerability identifier: #VU150459
CSH Severity: Low
CVSS v4: 2 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-89830
CWE-ID: CWE-703
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause a permanent leak of valid block counts.
The vulnerability exists due to improper error handling in __allocate_data_block() when a new data block allocation fails. A local user can trigger a data block allocation failure to cause a permanent leak of valid block counts.
The leaked accounting affects total_valid_block_count and i_blocks.
Affected software
Linux kernel
How to mitigate CVE-2026-89830
Install security update from vendor's repository.