CVE-2025-40179
ext4: verify orphan file size is not too big
Description
In the Linux kernel, the following vulnerability has been resolved: ext4: verify orphan file size is not too big In principle orphan file can be arbitrarily large. However orphan replay needs to traverse it all and we also pin all its buffers in memory. Thus filesystems with absurdly large orphan files can lead to big amounts of memory consumed. Limit orphan file size to a sane value and also use kvmalloc() for allocating array of block descriptor structures to avoid large order allocations for sane but large orphan files.
INFO
Published Date :
Nov. 12, 2025, 10:15 p.m.
Last Modified :
Nov. 12, 2025, 10:15 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Affected Products
The following products are affected by CVE-2025-40179
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
Solution
- Update the Linux kernel to the latest version.
- Apply the patch for ext4 orphan file size.
- Configure a sane limit for orphan file size.
- Ensure proper memory allocation for block descriptors.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2025-40179.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2025-40179 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2025-40179
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2025-40179 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2025-40179 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Nov. 12, 2025
Action Type Old Value New Value Added Description In the Linux kernel, the following vulnerability has been resolved: ext4: verify orphan file size is not too big In principle orphan file can be arbitrarily large. However orphan replay needs to traverse it all and we also pin all its buffers in memory. Thus filesystems with absurdly large orphan files can lead to big amounts of memory consumed. Limit orphan file size to a sane value and also use kvmalloc() for allocating array of block descriptor structures to avoid large order allocations for sane but large orphan files. Added Reference https://git.kernel.org/stable/c/0a6ce20c156442a4ce2a404747bb0fb05d54eeb3 Added Reference https://git.kernel.org/stable/c/2b9da798ff0f4d026c5f0f815047393ebe7d8859 Added Reference https://git.kernel.org/stable/c/304fc34ff6fc8261138fd81f119e024ac3a129e9 Added Reference https://git.kernel.org/stable/c/566a1d6084563bd07433025aa23bcea4427de107 Added Reference https://git.kernel.org/stable/c/95a21611b14ae0a401720645245a8db16f040995 Added Reference https://git.kernel.org/stable/c/a2d803fab8a6c6a874277cb80156dc114db91921