CVE-2026-89612 Linux kernel - Out of Bounds Read

Linux kernel contains an out-of-bounds read caused by improper handling of NTFS boot sector MFT LCNs, letting attackers trigger memory corruption via crafted high-bit values, exploit requires crafted NTFS boot sector.

CVSS base score 9.8 /10
Critical
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.55% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Out of Bounds Read
Impact
Denial Of Service
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/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 the fix for NTFS boot sector LCN handling.

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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