Linux Kernel up to 6.3.1 ubifs fscrypt_setup_filename allocation of resources

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4.9$0-$5k0.00

Summaryinfo

A vulnerability described as critical has been identified in Linux Kernel up to 6.3.1. Affected is the function fscrypt_setup_filename of the component ubifs. The manipulation results in allocation of resources. This vulnerability was named CVE-2023-53276. There is no available exploit. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability classified as critical has been found in Linux Kernel up to 6.3.1. Affected is the function fscrypt_setup_filename of the component ubifs. The manipulation with an unknown input leads to a allocation of resources vulnerability. CWE is classifying the issue as CWE-770. The product allocates a reusable resource or group of resources on behalf of an actor without imposing any restrictions on the size or number of resources that can be allocated, in violation of the intended security policy for that actor. The impact remains unknown. CVE summarizes:

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.

The advisory is available at git.kernel.org. This vulnerability is traded as CVE-2023-53276 since 09/16/2025. The exploitability is told to be difficult. Technical details are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 265674 (Linux Distros Unpatched Vulnerability : CVE-2023-53276), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 4.14.315, 4.19.283, 5.4.243, 5.10.180, 5.15.111, 6.1.28, 6.2.15 or 6.3.2 eliminates this vulnerability. Applying the patch 8ad8c67a897e68426e85990ebfe0a7d1f71fc79f/107d481642c356a5668058066360fc473911e628/823f554747f8aafaa965fb2f3ae794110ed429ef/b8f444a4fadfb5070ed7e298e0a5ceb4a18014f3/ce840284929b75dbbf062e0ce7fcb78a63b08b5e/29738e1bcc799dd754711d4e4aab967f0c018175/fd197308c0e4f738c7ea687d5332035c5753881c/1e43d4284bdc3bd34bd770fea13910ac37ab0618/1fb815b38bb31d6af9bd0540b8652a0d6fe6cfd3 is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the databases at Tenable (265674) and CERT Bund (WID-SEC-2025-2053). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Affected

  • Debian Linux
  • Amazon Linux 2
  • Red Hat Enterprise Linux
  • Ubuntu Linux
  • SUSE Linux
  • Oracle Linux
  • IBM QRadar SIEM
  • SUSE openSUSE
  • Open Source Linux Kernel
  • RESF Rocky Linux
  • Dell Secure Connect Gateway
  • F5 F5OS

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.0
VulDB Meta Temp Score: 4.9

VulDB Base Score: 4.6
VulDB Temp Score: 4.4
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔒

CVSSv2info

AVACAuCIA
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💳💳💳💳💳💳
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Allocation of resources
CWE: CWE-770 / CWE-400 / CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: Partially

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 265674
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2023-53276

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 4.14.315/4.19.283/5.4.243/5.10.180/5.15.111/6.1.28/6.2.15/6.3.2
Patch: 8ad8c67a897e68426e85990ebfe0a7d1f71fc79f/107d481642c356a5668058066360fc473911e628/823f554747f8aafaa965fb2f3ae794110ed429ef/b8f444a4fadfb5070ed7e298e0a5ceb4a18014f3/ce840284929b75dbbf062e0ce7fcb78a63b08b5e/29738e1bcc799dd754711d4e4aab967f0c018175/fd197308c0e4f738c7ea687d5332035c5753881c/1e43d4284bdc3bd34bd770fea13910ac37ab0618/1fb815b38bb31d6af9bd0540b8652a0d6fe6cfd3

Timelineinfo

09/16/2025 Advisory disclosed
09/16/2025 +0 days CVE reserved
09/16/2025 +0 days VulDB entry created
01/11/2026 +117 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2023-53276 (🔒)
GCVE (CVE): GCVE-0-2023-53276
GCVE (VulDB): GCVE-100-324378
CERT Bund: WID-SEC-2025-2053 - Linux Kernel: Mehrere Schwachstellen

Entryinfo

Created: 09/16/2025 14:06
Updated: 01/11/2026 09:17
Changes: 09/16/2025 14:06 (59), 09/21/2025 03:21 (2), 12/03/2025 20:19 (11), 12/29/2025 09:03 (7), 01/11/2026 09:17 (1)
Complete: 🔍
Cache ID: 216::103

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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