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CVE-2023-53396

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: ubifs: Fix memory leak in do_rename If renaming a file in an encrypted directory, function fscrypt_setup_filename allocates mem…

Published Sep 18, 2025CWE-401EPSS 0.15%

Overview

CVE-2023-53396 is a medium-severity vulnerability. It was published on September 18, 2025 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

ubifs: Fix memory leak in do_rename

If renaming a file in an encrypted directory, function

fscrypt_setup_filename allocates memory for a file name. This name is

never used, and before returning to the caller the memory for it is not

freed.

When running kmemleak on it we see that it is registered as a leak. The

report below is triggered by a simple program 'rename' that renames a

file in an encrypted directory:

unreferenced object 0xffff888101502840 (size 32):

comm "rename", pid 9404, jiffies 4302582475 (age 435.735s)

backtrace:

__kmem_cache_alloc_node

__kmalloc

fscrypt_setup_filename

do_rename

ubifs_rename

vfs_rename

do_renameat2

To fix this we can remove the call to fscrypt_setup_filename as it's not

needed.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/3a36d20e012903f45714df2731261fdefac900cbRefgit.kernel.org/stable/c/43b2f7d690697182beed6f71aa57b7249d3cfc9cRefgit.kernel.org/stable/c/517ddc0259d7a7231486bdafde8035c478bc4088Refgit.kernel.org/stable/c/7e264f67b7d6580eff5c2696961039fd05c69258Refgit.kernel.org/stable/c/9f565752b328fe53c9e42b7d4e4d89a1da63d738

How CyberStrike helps

Frequently asked questions

What is CVE-2023-53396?

CVE-2023-53396 is a medium-severity vulnerability. It was published on September 18, 2025 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2023-53396?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2023-53396?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2023-53396?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2023-53396 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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