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CVE-2023-53276

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: ubifs: Free memory for tmpfile name When opening a ubifs tmpfile on an encrypted directory, function fscrypt_setup_filename all…

Published Sep 16, 2025CWE-401EPSS 0.16%

Overview

CVE-2023-53276 is a medium-severity vulnerability. It was published on September 16, 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: Free memory for tmpfile name

When opening a ubifs tmpfile on an encrypted directory, function

fscrypt_setup_filename allocates memory for the name that is to be

stored in the directory entry, but after the name has been copied to the

directory entry inode, the memory 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 'tmpfile' just opening a

tmpfile:

unreferenced object 0xffff88810178f380 (size 32):

comm "tmpfile", pid 509, jiffies 4294934744 (age 1524.742s)

backtrace:

__kmem_cache_alloc_node

__kmalloc

fscrypt_setup_filename

ubifs_tmpfile

vfs_tmpfile

path_openat

Free this memory after it has been copied to the inode.

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/107d481642c356a5668058066360fc473911e628Refgit.kernel.org/stable/c/1e43d4284bdc3bd34bd770fea13910ac37ab0618Refgit.kernel.org/stable/c/1fb815b38bb31d6af9bd0540b8652a0d6fe6cfd3Refgit.kernel.org/stable/c/29738e1bcc799dd754711d4e4aab967f0c018175Refgit.kernel.org/stable/c/823f554747f8aafaa965fb2f3ae794110ed429efRefgit.kernel.org/stable/c/8ad8c67a897e68426e85990ebfe0a7d1f71fc79fRefgit.kernel.org/stable/c/b8f444a4fadfb5070ed7e298e0a5ceb4a18014f3Refgit.kernel.org/stable/c/ce840284929b75dbbf062e0ce7fcb78a63b08b5eRefgit.kernel.org/stable/c/fd197308c0e4f738c7ea687d5332035c5753881c

How CyberStrike helps

Frequently asked questions

What is CVE-2023-53276?

CVE-2023-53276 is a medium-severity vulnerability. It was published on September 16, 2025 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2023-53276?

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-2023-53276?

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-2023-53276?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2023-53276 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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