Improper Check or Handling of Exceptional Conditions in Linux kernel - CVE-2026-89830

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

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.

Linux kernel
Debian Linux
Ubuntu
linux (Ubuntu package)
linux-aws (Ubuntu package)
linux-gcp (Ubuntu package)
linux-oracle (Ubuntu package)
linux-ibm (Ubuntu package)
linux-hwe-7.0 (Ubuntu package)
linux-oem-7.0 (Ubuntu package)
linux (Debian package)

Install security update from vendor's repository.

linux (Ubuntu package) - update to 7.0.0-42.42
linux-aws (Ubuntu package) - update to 7.0.0-1016.17
linux-gcp (Ubuntu package) - update to 7.0.0-1016.18
linux-oracle (Ubuntu package) - update to 7.0.0-1015.16
linux-ibm (Ubuntu package) - update to 7.0.0-1017.17
linux-hwe-7.0 (Ubuntu package) - update to 7.0.0-42.42~24.04.1
linux-oem-7.0 (Ubuntu package) - update to 7.0.0-1017.17
linux (Debian package) - update to 6.12.111-1

• 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

• Improper Check or Handling of Exceptional Conditions in Linux kernel f2fs
• Debian update for linux
• Ubuntu update for linux-oem-7.0
• Ubuntu update for linux, linux-aws, linux-gcp and more