SB20260912169 - Out-of-bounds read in Linux kernel ntfs

Description

This security bulletin contains information about 1 vulnerability.

1) Out-of-bounds read (CVE-ID: CVE-2026-89614)

CWE-ID: CWE-125 - Out-of-bounds read

CVSSv4: 2 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]

The vulnerability allows a local user to read out-of-bounds memory.

The vulnerability exists due to an out-of-bounds read in the NTFS cluster allocator when extending a file on an NTFS volume. A local user can extend a file whose last logical cluster number lies outside the volume's cluster range to read out-of-bounds memory.

Exploitation requires a volume whose $Bitmap covers more clusters than the volume.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/19cac7902a8ab748e15f98ddaafcf5f8882be21d
• https://git.kernel.org/stable/c/dc15a9f5307d5372aef3b64bf3ed7802f530c471