CVE-2026-97486
Received Received - Intake

HPFS Block Size Handling Failure in Linux Kernel

Publication date: 2026-09-24

Last updated on: 2026-09-24

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: hpfs: handle set_blocksize failures hpfs uses buffer_heads, which don't handle block size > PAGE_SIZE well. Without this, mounting will hit the BUG_ON(offset >= folio_size(folio)); in folio_set_bh on the first __bread_gfp call.

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Meta Information

Published
2026-09-24
Last Modified
2026-09-24
Generated
2026-09-24
AI Q&A
2026-09-24
EPSS Evaluated
N/A
NVD
CVE-2026-97486
EUVD
EUVD-2026-86084

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
linux linux_kernel *

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Exploitability

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KEV
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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This vulnerability in the Linux kernel involves the HPFS (High Performance File System) driver failing to handle set_blocksize operations correctly. HPFS uses buffer_heads which do not support block sizes larger than the system's page size. This can lead to a kernel bug when mounting filesystems, triggering a BUG_ON assertion failure in folio_set_bh during the first __bread_gfp call.

Detection Guidance

This vulnerability is specific to the Linux kernel's HPFS (High Performance File System) handling. Detection involves checking kernel logs for mount failures or BUG_ON errors related to hpfs or blocksize issues. Use commands like dmesg | grep -i hpfs or journalctl -k | grep -i hpfs to review system logs for errors.

Impact Analysis

This vulnerability could cause system crashes or instability when mounting HPFS filesystems, potentially leading to data corruption or denial of service. Users relying on HPFS filesystems may experience filesystem errors or kernel panics.

Mitigation Strategies

Apply the latest Linux kernel update that includes the fix for this vulnerability. Avoid mounting HPFS filesystems if possible until the update is applied. Monitor kernel logs for any related errors after applying updates.

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