Linux Kernel up to 6.3.2 ext4_mb_release_group_pa denial of service

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CTI Interest Score
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5.5$0-$5k0.00

Summaryinfo

A vulnerability identified as critical has been detected in Linux Kernel up to 6.3.2. This affects the function ext4_mb_release_group_pa. This manipulation causes denial of service. This vulnerability is tracked as CVE-2023-53450. No exploit exists. You should upgrade the affected component.

Detailsinfo

A vulnerability has been found in Linux Kernel up to 6.3.2 and classified as critical. Affected by this vulnerability is the function ext4_mb_release_group_pa. The manipulation with an unknown input leads to a denial of service vulnerability. The CWE definition for the vulnerability is CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. As an impact it is known to affect availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: ext4: remove a BUG_ON in ext4_mb_release_group_pa() If a malicious fuzzer overwrites the ext4 superblock while it is mounted such that the s_first_data_block is set to a very large number, the calculation of the block group can underflow, and trigger a BUG_ON check. Change this to be an ext4_warning so that we don't crash the kernel.

It is possible to read the advisory at git.kernel.org. This vulnerability is known as CVE-2023-53450 since 09/17/2025. Technical details of the vulnerability are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 278484 (EulerOS 2.0 SP13 : kernel (EulerOS-SA-2025-2501)), 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, 5.15.112, 6.1.29, 6.2.16 or 6.3.3 eliminates this vulnerability. Applying the patch d5bf8f7fb3ee3d99d1303ceb54599ea0599a4a5b/ef16d8a1798db1a1604ac44ca1bd73ec6bebf483/185062a21976fbc38f2efd296951b02c4500cf65/b0fc279de4bf17e1710bb7e83906538ff8f11111/978e5e9111af18741449b81fefd531a622dd969a/d87a4e4094c9879fc8acdff8ce59fdffa979c8e0/bf2a16eb4e6d06124bd8436d4546f61539a65f29/53c14e7cc2257191ba15425c15638fc4f8abb92b/463808f237cf73e98a1a45ff7460c2406a150a0b 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 (278484) and CERT Bund (WID-SEC-2025-2187). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Affected

  • Amazon Linux 2
  • Red Hat Enterprise Linux
  • SUSE Linux
  • Oracle Linux
  • Open Source Linux Kernel
  • Dell Secure Connect Gateway

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.6
VulDB Meta Temp Score: 5.5

VulDB Base Score: 5.7
VulDB Temp Score: 5.5
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔒

CVSSv2info

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

Exploitinginfo

Class: Denial of service
CWE: 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: 278484
Nessus Name: EulerOS 2.0 SP13 : kernel (EulerOS-SA-2025-2501)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 4.14.315/4.19.283/5.4.243/5.10.180/5.15.112/6.1.29/6.2.16/6.3.3
Patch: d5bf8f7fb3ee3d99d1303ceb54599ea0599a4a5b/ef16d8a1798db1a1604ac44ca1bd73ec6bebf483/185062a21976fbc38f2efd296951b02c4500cf65/b0fc279de4bf17e1710bb7e83906538ff8f11111/978e5e9111af18741449b81fefd531a622dd969a/d87a4e4094c9879fc8acdff8ce59fdffa979c8e0/bf2a16eb4e6d06124bd8436d4546f61539a65f29/53c14e7cc2257191ba15425c15638fc4f8abb92b/463808f237cf73e98a1a45ff7460c2406a150a0b

Timelineinfo

09/17/2025 CVE reserved
10/01/2025 +14 days Advisory disclosed
10/01/2025 +0 days VulDB entry created
01/23/2026 +114 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2023-53450 (🔒)
GCVE (CVE): GCVE-0-2023-53450
GCVE (VulDB): GCVE-100-326587
CERT Bund: WID-SEC-2025-2187 - Linux Kernel: Mehrere Schwachstellen ermöglichen Denial of Service

Entryinfo

Created: 10/01/2025 15:01
Updated: 01/23/2026 05:40
Changes: 10/01/2025 15:01 (58), 11/24/2025 03:51 (7), 12/14/2025 06:33 (2), 01/23/2026 05:40 (10)
Complete: 🔍
Cache ID: 216::103

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