Integer overflow in Linux kernel - CVE-2026-89840
Published: September 17, 2026
Vulnerability identifier: #VU150452
CSH Severity: Low
CVSS v4: 6.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-89840
CWE-ID: CWE-190
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause data corruption and a denial of service.
The vulnerability exists due to an integer overflow in the F2FS F2FS_IOC_MOVE_RANGE operation when moving a range with unchecked destination offsets. A local user can invoke the operation with crafted range offsets to cause data corruption and a denial of service.
A source hole can cause the block-cloning operation to succeed while extending the destination inode using an unchecked destination end position.
Affected software
Linux kernel
How to mitigate CVE-2026-89840
Install security update from vendor's repository.