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CVE

CVE-2026-89612

ntfs: reject invalid MFT LCNs from boot sector
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CVE

CVE-2026-89612

ntfs: reject invalid MFT LCNs from boot sector

In the Linux kernel, the following vulnerability has been resolved:

ntfs: reject invalid MFT LCNs from boot sector

The NTFS boot sector stores the MFT and MFTMirr locations as unsigned

64-bit LCNs, but parsentfsboot_sector() decoded them into an s64.

A crafted high-bit value could therefore become negative and pass

the existing upper-bound check. The invalid value then propagated into

the MFT zone allocator and could result in an out-of-bounds access to

lcnemptybitsperpage.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
9.8
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
C
H
U
0
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
C
H
U
-

Related Resources

No items found.

References

https://git.kernel.org/stable/c/8f8420b68a6f05ca2b03779d8208814ec539b9e5, https://git.kernel.org/stable/c/cc9d09fef78410bcd37ac05168cbd5f6dd75d3d2, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89612.json, https://nvd.nist.gov/vuln/detail/CVE-2026-89612, https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Severity

9.8

CVSS Score
0
10

Basic Information

Base CVSS
9.8
EPSS Probability
0.00553%
EPSS Percentile
0.44468%
Introduced Version
11ccc9107dc460de28af90fac1f42404d9802735,7.1.0,0
Fix Available
cc9d09fef78410bcd37ac05168cbd5f6dd75d3d2,7.2.4

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