CVE-2026-89612
Critical
Description
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.
SeverityCritical
CVSS9.8
Exploit probability—
Product
Linux
PublishedSep 11, 2026
First seenSep 11, 2026
How to fix
Update
- Linux Linux8f8420b68a6f05ca2b03779d8208814ec539b9e5, cc9d09fef78410bcd37ac05168cbd5f6dd75d3d2 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 11ccc9107dc460de28af90fac1f42404d9802735 ≤ v < 8f8420b68a6f05ca2b03779d8208814ec539b9e5, 11ccc9107dc460de28af90fac1f42404d9802735 ≤ v < cc9d09fef78410bcd37ac05168cbd5f6dd75d3d2, 7.1 | 8f8420b68a6f05ca2b03779d8208814ec539b9e5, cc9d09fef78410bcd37ac05168cbd5f6dd75d3d2 |
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