CVE-2025-68266
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Publication date: 2025-12-16

Last updated on: 2026-01-19

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: bfs: Reconstruct file type when loading from disk syzbot is reporting that S_IFMT bits of inode->i_mode can become bogus when the S_IFMT bits of the 32bits "mode" field loaded from disk are corrupted or when the 32bits "attributes" field loaded from disk are corrupted. A documentation says that BFS uses only lower 9 bits of the "mode" field. But I can't find an explicit explanation that the unused upper 23 bits (especially, the S_IFMT bits) are initialized with 0. Therefore, ignore the S_IFMT bits of the "mode" field loaded from disk. Also, verify that the value of the "attributes" field loaded from disk is either BFS_VREG or BFS_VDIR (because BFS supports only regular files and the root directory).
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Meta Information
Published
2025-12-16
Last Modified
2026-01-19
Generated
2026-06-16
AI Q&A
2025-12-16
EPSS Evaluated
2026-06-14
NVD
CVE-2025-68266
Affected Vendors & Products
Currently, no data is known.
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-UNKNOWN
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Executive Summary

This vulnerability involves the BFS filesystem in the Linux kernel where the file type bits (S_IFMT) of the inode's mode can become incorrect if the mode or attributes fields loaded from disk are corrupted. BFS uses only the lower 9 bits of the mode field, but the upper 23 bits, including S_IFMT bits, may not be properly initialized, leading to bogus file type information. The fix involves ignoring the S_IFMT bits from the mode field loaded from disk and verifying that the attributes field is either BFS_VREG (regular file) or BFS_VDIR (directory), as BFS supports only these two types.

Impact Analysis

This vulnerability can cause the file type information of files in the BFS filesystem to be incorrect due to corrupted mode or attributes fields. This may lead to improper handling of files by the system or applications, potentially causing errors or unexpected behavior when accessing or managing files.

Mitigation Strategies

To mitigate this vulnerability, ensure that your Linux kernel is updated to a version where the BFS filesystem properly reconstructs the file type when loading from disk. Specifically, the fix involves ignoring the S_IFMT bits of the mode field loaded from disk and verifying that the attributes field is either BFS_VREG or BFS_VDIR. Applying the latest kernel patches or updates that address this issue is recommended.

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