SB20260917137 - Improper Check or Handling of Exceptional Conditions in Linux kernel f2fs

Description

This security bulletin contains information about 1 vulnerability.

1) Improper Check or Handling of Exceptional Conditions (CVE-ID: CVE-2026-89830)

CWE-ID: CWE-703 - Improper Check or Handling of Exceptional Conditions

CVSSv4: 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]

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.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/0f9af07ecc1ab486038373db6ae0436c5d674b19
• https://git.kernel.org/stable/c/2d50b6d47e5671ff6a25834c5906d443356191f0
• https://git.kernel.org/stable/c/931e1aa4d44c52ff8e0feb38420a8827c62e886b
• https://git.kernel.org/stable/c/dde99df5a9d3b0ca6ac0a86f98799685f7399432