GNU grub2 hfs out-of-bounds write

CVSS Meta Temp Score
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CTI Interest Score
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7.4$0-$5k0.00

Summaryinfo

A vulnerability identified as critical has been detected in GNU grub2. This issue affects some unknown processing of the component hfs. This manipulation causes out-of-bounds write. The identification of this vulnerability is CVE-2025-1125. The attack can only be executed locally. There is no exploit available.

Detailsinfo

A vulnerability was found in GNU grub2 (affected version not known). It has been declared as critical. Affected by this vulnerability is some unknown functionality of the component hfs. The manipulation with an unknown input leads to a out-of-bounds write vulnerability. The CWE definition for the vulnerability is CWE-787. The product writes data past the end, or before the beginning, of the intended buffer. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

When reading data from a hfs filesystem, grub's hfs filesystem module uses user-controlled parameters from the filesystem metadata to calculate the internal buffers size, however it misses to properly check for integer overflows. A maliciouly crafted filesystem may lead some of those buffer size calculation to overflow, causing it to perform a grub_malloc() operation with a smaller size than expected. As a result the hfsplus_open_compressed_real() function will write past of the internal buffer length. This flaw may be leveraged to corrupt grub's internal critical data and may result in arbitrary code execution by-passing secure boot protections.

It is possible to read the advisory at bugzilla.redhat.com. This vulnerability is known as CVE-2025-1125 since 02/07/2025. The exploitation appears to be easy. Attacking locally is a requirement. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 01/08/2026).

The vulnerability scanner Nessus provides a plugin with the ID 216508 (SUSE SLES15 Security Update : grub2 (SUSE-SU-2025:0588-1)), which helps to determine the existence of the flaw in a target environment.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the databases at Tenable (216508) and EUVD (EUVD-2025-5597). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.8
VulDB Meta Temp Score: 7.8

VulDB Base Score: 7.8
VulDB Temp Score: 7.8
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.8
NVD Vector: 🔍

CNA Base Score: 7.8
CNA Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Out-of-bounds write
CWE: CWE-787 / CWE-119
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: 216508
Nessus Name: SUSE SLES15 Security Update : grub2 (SUSE-SU-2025:0588-1)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

02/07/2025 🔍
02/18/2025 +11 days 🔍
02/18/2025 +0 days 🔍
01/08/2026 +324 days 🔍

Sourcesinfo

Vendor: gnu.org

Advisory: bugzilla.redhat.com
Status: Not defined

CVE: CVE-2025-1125 (🔍)
GCVE (CVE): GCVE-0-2025-1125
GCVE (VulDB): GCVE-100-296179
EUVD: 🔍

Entryinfo

Created: 02/18/2025 20:53
Updated: 01/08/2026 05:38
Changes: 02/18/2025 20:53 (50), 02/20/2025 12:59 (2), 03/06/2025 09:10 (13), 07/05/2025 09:34 (1), 08/01/2025 00:47 (11), 08/12/2025 17:15 (5), 01/08/2026 05:38 (3)
Complete: 🔍
Cache ID: 216::103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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