CVE-2026-80881
Received Received - Intake

Buffer Head Management Flaw in OCFS2 Kernel Module

Publication date: 2026-09-04

Last updated on: 2026-09-04

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: ocfs2: fix buffer head management in ocfs2_read_blocks() In ocfs2_read_blocks(), caller should't assume that buffer head returned by 'sb_getblk()' is exclusively owned and so 'put_bh()' always drops b_count from 1 to 0. If it is not so, buffer head remains on hold and likely to be returned by the next call to 'sb_getblk()' unchanged - that is, with BH_Uptodate bit set even if it has failed validation previously, thus allowing to insert that buffer head into OCFS2 metadata cache and submit it to upper layers. To avoid such a scenario, BH_Uptodate should be cleared immediately after 'validate()' callback has detected some data inconsistency.

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Meta Information

Published
2026-09-04
Last Modified
2026-09-04
Generated
2026-09-05
AI Q&A
2026-09-04
EPSS Evaluated
N/A
NVD
CVE-2026-80881
EUVD
EUVD-2026-71511

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
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 affects the OCFS2 file system. It involves incorrect buffer head management in the ocfs2_read_blocks() function. The issue occurs when a buffer head returned by sb_getblk() is not exclusively owned, leading to improper handling of the buffer head's state. This can cause the buffer head to remain in use even after validation fails, potentially allowing corrupted data to be cached and used by upper layers.

Detection Guidance

This vulnerability is specific to the Linux kernel's OCFS2 filesystem and requires kernel-level inspection. Detection involves checking kernel logs for OCFS2-related errors or examining filesystem metadata for inconsistencies. Commands like dmesg | grep ocfs2 or journalctl -k | grep ocfs2 may help identify issues. However, no direct detection commands are provided in the context.

Impact Analysis

This vulnerability could lead to data corruption or system crashes if exploited. Attackers might manipulate the buffer head state to insert invalid metadata into the OCFS2 cache, causing the system to read or write incorrect data. This could result in file system errors, application failures, or unauthorized access to sensitive information.

Mitigation Strategies

Update the Linux kernel to the latest patched version to resolve this OCFS2 buffer head management issue. Monitor OCFS2 filesystem operations for errors and ensure proper validation of metadata before use. No specific mitigation commands are provided in the context.

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