CVE-2025-1125: Out-of-bounds Write
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.
AI Analysis
Technical Summary
The vulnerability occurs in GRUB's hfs filesystem module when reading data from an HFS filesystem. The module uses parameters from filesystem metadata to calculate internal buffer sizes but fails to properly check for integer overflows. This can cause grub_malloc() to allocate a smaller buffer than intended, leading the hfsplus_open_compressed_real() function to write beyond the allocated buffer boundary. Exploiting this flaw may corrupt critical internal data and enable arbitrary code execution, bypassing secure boot mechanisms.
Potential Impact
Successful exploitation can result in memory corruption within GRUB, potentially allowing an attacker to execute arbitrary code during the boot process. This compromises system integrity and can bypass secure boot protections, posing a significant security risk.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. The Red Hat advisory URL is provided for updates: https://access.redhat.com/security/cve/CVE-2025-1125. Until a patch is available, avoid using untrusted HFS filesystems with affected GRUB versions.
CVE-2025-1125: Out-of-bounds Write
Description
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.
CVSS v3.1
Score 7.8high
Affected software
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability occurs in GRUB's hfs filesystem module when reading data from an HFS filesystem. The module uses parameters from filesystem metadata to calculate internal buffer sizes but fails to properly check for integer overflows. This can cause grub_malloc() to allocate a smaller buffer than intended, leading the hfsplus_open_compressed_real() function to write beyond the allocated buffer boundary. Exploiting this flaw may corrupt critical internal data and enable arbitrary code execution, bypassing secure boot mechanisms.
Potential Impact
Successful exploitation can result in memory corruption within GRUB, potentially allowing an attacker to execute arbitrary code during the boot process. This compromises system integrity and can bypass secure boot protections, posing a significant security risk.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. The Red Hat advisory URL is provided for updates: https://access.redhat.com/security/cve/CVE-2025-1125. Until a patch is available, avoid using untrusted HFS filesystems with affected GRUB versions.
Technical Details
- Data Version
- 5.1
- Assigner Short Name
- redhat
- Date Reserved
- 2025-02-07T20:34:30.777Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Vendor Advisory Urls
- [{"url":"https://access.redhat.com/security/cve/CVE-2025-1125","vendor":"Red Hat"}]
Threat ID: 6868be146f40f0eb72a6ac95
Added to database: 07/05/2025, 05:54:28 UTC
Last enriched: 07/02/2026, 22:16:39 UTC
Last updated: 09/10/2026, 19:36:49 UTC
Views: 306
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