by Kastro
Paper/Archive/CVE-2026-89612

CVE-2026-89612

Linux Linux — ntfs: reject invalid MFT LCNs from boot sector

EPSS 0.6%CVSS 9.8
critical.is priorityof 100
39
CVSS 9.8 (CNA)9.8 / 10 × 3029.4Not in CISA KEV+300.0EPSS percentile 46.1.461 × 209.2No public exploit+100.0SSVC exploitation: unknown+100.0
Description · from the CVE record

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 parse_ntfs_boot_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 lcn_empty_bits_per_page.

Affected

ProductAffectedFixed inSource
Linux11ccc9107dc460de28af90fac1f42404d9802735 – < 8f8420b68a6f05ca2b03779d8208814ec539b9e58f8420b68a6f05ca2b03779d8208814ec539b9e5CNA
Linux11ccc9107dc460de28af90fac1f42404d9802735 – < cc9d09fef78410bcd37ac05168cbd5f6dd75d3d2cc9d09fef78410bcd37ac05168cbd5f6dd75d3d2CNA
Linux7.17.2.4CNA

Scores by source

Linux (CNA)9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

refgit.kernel.org/stable/c/8f8420b68a6f05ca2b03779d8208814ec539b9e5refgit.kernel.org/stable/c/cc9d09fef78410bcd37ac05168cbd5f6dd75d3d2