---
id: "CVE-2026-98880"
kind: "vulnerability"
aliases: ["CVE-2026-98880"]
title: "Linux kernel ntfs3: unhandled set_blocksize failure crashes NTFS mounts"
severity: "unknown"
cvss: null
epss: 0.00209
exploited: false
status: "open"
category: "infrastructure"
products: []
ecosystems: []
tags: ["infrastructure", "kernel", "linux", "ntfs3", "self-hosted"]
not_affected_if: ["no-ntfs3-mounts", "ntfs-3g-only"]
published_at: "2026-10-23T12:18:21+00:00"
first_seen_at: "2026-10-23T21:57:33+00:00"
updated_at: "2026-10-25T12:38:51+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98880", "first_seen_at": "2026-10-23T21:57:33+00:00"}, {"source": "epss", "url": "https://api.first.org/data/v1/epss?cve=CVE-2026-98880", "first_seen_at": "2026-10-25T12:38:51+00:00"}]
---

# Linux kernel ntfs3: unhandled set_blocksize failure crashes NTFS mounts

In the Linux kernel's ntfs3 driver, a failed set_blocksize call is not handled, so mounting an NTFS volume with a block size larger than the page size hits a kernel BUG_ON. The sources describe a kernel crash on mount rather than any data access or code execution.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- `uname -r` to see the running kernel version and compare it with the fixed release in the NVD entry
- `lsmod | grep ntfs3` to check whether the ntfs3 driver is loaded
- unknown whether any other check is needed; the sources do not say

## Fix

- Update the Linux kernel to a release that includes the upstream ntfs3 set_blocksize fix; the exact fixed version is unknown from the sources
- Until patched, avoid mounting NTFS volumes with the ntfs3 driver if practical

## Timeline

- 2026-10-23T21:57:33+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-98880
- 2026-10-25T12:38:51+00:00 epss https://api.first.org/data/v1/epss?cve=CVE-2026-98880

## From the sources

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

ntfs3: handle set_blocksize failures

ntfs3 uses buffer_heads, which don't handle block size > PAGE_SIZE well.
Without this, mounting we will hit the

        BUG_ON(offset >= folio_size(folio));

in folio_set_bh on the first __bread_gfp call.

---

_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_