CVE-2026-89840 Linux kernel f2fs - Broken Access Control

Linux kernel contains a broken access control vulnerability in f2fs where F2FS_IOC_MOVE_RANGE does not validate destination size properly, letting attackers cause destination inode overflow, exploit requires ability to invoke MOVE_RANGE ioctl.

CVSS base score 7.1 /10
High
CISA KEV
Not listed
Public exploit
None known
EPSS
0.17% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Broken Access Control
Impact
Broken Access Control
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
Published
16 September 2026
Updated
15 October 2026

Vendor fix

Update to the latest Linux kernel version with the fix for F2FS_IOC_MOVE_RANGE validation.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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