CVE-2026-89601 Linux Kernel ext2 - Broken Access Control

Linux kernel ext2 filesystem contains a broken access control caused by lost inode updates for IS_SYNC inodes due to improper inode metadata synchronization, letting attackers cause data corruption, exploit requires local access.

CVSS base score 8.8 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.51% chance of exploitation in 30 days
View the NVD record ↗

Details

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

Vendor fix

Update to the latest Linux kernel version with ext2 inode update fix.

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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