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National Vulnerability Database

National Vulnerability Database

NVD

National Vulnerability Database
  1. Vulnerabilities

CVE-2025-40049 Detail

Description

In the Linux kernel, the following vulnerability has been resolved: Squashfs: fix uninit-value in squashfs_get_parent Syzkaller reports a "KMSAN: uninit-value in squashfs_get_parent" bug. This is caused by open_by_handle_at() being called with a file handle containing an invalid parent inode number. In particular the inode number is that of a symbolic link, rather than a directory. Squashfs_get_parent() gets called with that symbolic link inode, and accesses the parent member field. unsigned int parent_ino = squashfs_i(inode)->parent; Because non-directory inodes in Squashfs do not have a parent value, this is uninitialised, and this causes an uninitialised value access. The fix is to initialise parent with the invalid inode 0, which will cause an EINVAL error to be returned. Regular inodes used to share the parent field with the block_list_start field. This is removed in this commit to enable the parent field to contain the invalid inode number 0.


Metrics

 
NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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URL Source(s) Tag(s)
https://git.kernel.org/stable/c/1b3ccd0019132880c94bb00ca7088c1749308f82 kernel.org
https://git.kernel.org/stable/c/382a47fae449e554ef1e8c198667fd2f3270b945 kernel.org
https://git.kernel.org/stable/c/61d38b5ce2782bff3cacaacbb8164087a73ed1a5 kernel.org
https://git.kernel.org/stable/c/74058c0a9fc8b2b4d5f4a0ef7ee2cfa66a9e49cf kernel.org
https://git.kernel.org/stable/c/81a2bca52d43fc9d9abf07408b91255131c5dc53 kernel.org
https://git.kernel.org/stable/c/91b99db7a92e57ff48a96a1b10fddfd2547e7f53 kernel.org
https://git.kernel.org/stable/c/c28b0ca029edf5d0558abcd76cb8c732706cd339 kernel.org
https://git.kernel.org/stable/c/f81a5bc9e924ee1950e0dd82bd10749048390f6e kernel.org

Weakness Enumeration

CWE-ID CWE Name Source

Change History

2 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2025-40049
NVD Published Date:
10/28/2025
NVD Last Modified:
04/14/2026
Source:
kernel.org