BaseFortify

Publication date: 2025-11-12

Last updated on: 2025-11-14

Assigner: kernel.org

Description

In the Linux kernel, the following vulnerability has been resolved: Squashfs: reject negative file sizes in squashfs_read_inode() Syskaller reports a "WARNING in ovl_copy_up_file" in overlayfs. This warning is ultimately caused because the underlying Squashfs file system returns a file with a negative file size. This commit checks for a negative file size and returns EINVAL. [[email protected]: only need to check 64 bit quantity]

CVSS Scores

EPSS Scores

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Meta Information

Published

2025-11-12

Last Modified

2025-11-14

Generated

2026-07-06

AI Q&A

2025-11-13

EPSS Evaluated

2026-07-05

NVD

CVE-2025-40200

Affected Vendors & Products

Vendor	Product	Version / Range
linux	linux_kernel	*

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-UNKNOWN

Attack-Flow Graph

Executive Summary

This vulnerability occurs in the Linux kernel's Squashfs file system where negative file sizes were not properly rejected in the function squashfs_read_inode(). This could cause a warning in overlayfs when it encounters a file with a negative size returned by Squashfs. The issue was fixed by adding a check for negative file sizes and returning an error (EINVAL) if detected.

Impact Analysis

If exploited, this vulnerability could cause unexpected behavior or warnings in the overlayfs file system due to negative file sizes being processed. This might lead to system instability or errors when accessing files on Squashfs file systems.

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