High [CVE-2025-1125] Grub2: fs/hfs: integer overflow may lead to heap based out-of-bounds write
This high-severity Red Hat Linux advisory covers CVE-2025-1125.
Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.
VulniPulse record published
Summary
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. To exploit this flaw, an attacker needs to trick a user into running grub2 with a specially crafted HFS file system image, limiting the exposure of this flaw.
For this reason, this vulnerability has been rated with a Moderate severity. The grub2 package as shipped in Red Hat Enterprise Linux 7, 8, 9 and in Red Hat OpenShift Container Platform 4 is not affected by this vulnerability because the HFS module is not built, so this issue is not applicable.
Red Hat severity: Moderate — CVSS 7.8 (CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H). Weakness: CWE-787.
Is CVE-2025-1125 exploited?
No exploitation is reported in the sources VulniPulse tracks: CVE-2025-1125 is not in the CISA KEV catalog (checked ) and this advisory does not report exploitation. That is not proof the vulnerability cannot be exploited.
How do I fix CVE-2025-1125?
The advisory VulniPulse tracks names no fixed release. Follow Red Hat's guidance for workarounds and updates.
Confirm against the vendor advisory before you patch.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative. Check it before change work.
Official advisory · high-confidence parse· fetched 20 days ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists. Confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 20 days ago·verify at source
Mitigation checklist
- Do not run grub2 in an untrusted environment, specifically with a HFS file system image.
Official advisory · high-confidence parse· fetched 20 days ago·verify at source
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