Critical severity · published Sep 11, 2026
CVE-2026-89612
ntfs: reject invalid MFT LCNs from boot sector
9.8
CVSS
0.6%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.6% · higher than 46% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
LI
Linux · Linux
11ccc9107dc460de28af90fac1f42404d9802735 before 8f8420b68a6f05ca2b03779d8208814ec539b9e5; 11ccc9107dc460de28af90fac1f42404d9802735 before cc9d09fef78410bcd37ac05168cbd5f6dd75d3d2; 7.1 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-89612
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-89612
git.kernel.org
https://git.kernel.org/stable/c/8f8420b68a6f05ca2b03779d8208814ec539b9e5
git.kernel.org
https://git.kernel.org/stable/c/cc9d09fef78410bcd37ac05168cbd5f6dd75d3d2
More from Linux
9.8
CVE-2025-39682
tls: fix handling of zero-length records on the rx_list
8.8
CVE-2026-53266
netfilter: bridge: make ebt_snat ARP rewrite writable
7.8
CVE-2026-53362
ipv6: account for fraggap on the paged allocation path
7.8
CVE-2026-31431
crypto: algif_aead - Revert to operating out-of-place
7.8
CVE-2025-38352
posix-cpu-timers: fix race between handle_posix_cpu_timers() and posix_cpu_timer_del()