CVE-2025-0684
published 2025-03-03CVE-2025-0684: A flaw was found in grub2. When performing a symlink lookup from a reiserfs filesystem, grub's reiserfs fs module uses user-controlled parameters from the…
PriorityP335medium6.4CVSS 3.1
AVLACHPRHUINSUCHIHAH
EPSS
0.26%
17.7th percentile
A flaw was found in grub2. When performing a symlink lookup from a reiserfs filesystem, grub's reiserfs fs module uses user-controlled parameters from the filesystem geometry to determine the internal buffer size, however, it improperly checks for integer overflows. A maliciouly crafted filesystem may lead some of those buffer size calculations to overflow, causing it to perform a grub_malloc() operation with a smaller size than expected. As a result, the grub_reiserfs_read_symlink() will call grub_reiserfs_read_real() with a overflown length parameter, leading to a heap based out-of-bounds write during data reading. This flaw may be leveraged to corrupt grub's internal critical data and can result in arbitrary code execution, by-passing secure boot protections.
Affected
12 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | grub2 | < grub2 2.12-6 (forky) | grub2 2.12-6 (forky) |
| gnu | grub2 | <= 2.12 | — |
| gnu | grub2 | >= 0 < 2.12-6 | 2.12-6 |
| gnu | grub2 | >= 0 < 2.12-6 | 2.12-6 |
| msrc | azl3_coreutils_9.4-5_on_azure_linux_3.0 | — | — |
| msrc | azl3_coreutils_9.4-6_on_azure_linux_3.0 | — | — |
| msrc | azl3_grub2_2.06-24_on_azure_linux_3.0 | — | — |
| msrc | azl3_grub2_2.06-25_on_azure_linux_3.0 | — | — |
| msrc | azure_linux_3.0_arm | — | — |
| msrc | azure_linux_3.0_x64 | — | — |
| msrc | cbl2_grub2_2.06-14_on_cbl_mariner_2.0 | — | — |
| msrc | cbl2_grub2_2.06-15_on_cbl_mariner_2.0 | — | — |
CVSS provenance
nvdv3.16.4MEDIUMCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
osv6.4MEDIUM
vendor_debian6.4MEDIUM
vendor_msrc6.4MEDIUM
vendor_redhat6.4MEDIUM
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Microsoft
Grub2: reiserfs: integer overflow when handling symlinks may lead to heap based out-of-bounds write when reading data
vendor_msrc·2025-03-11·CVSS 6.4
CVE-2025-0684 [MEDIUM] CWE-787 Grub2: reiserfs: integer overflow when handling symlinks may lead to heap based out-of-bounds write when reading data
Grub2: reiserfs: integer overflow when handling symlinks may lead to heap based out-of-bounds write when reading data
FAQ: Is Azure Linux the only Microsoft product that includes this open-source library and is therefore potentially affected by this vulnerability?
One of the main benefits to our customers who choose to use the Azure Linux distro is the commitment to keep it up to date with the most recent and most secure versions of the open source libraries with which the distro is composed. Microsoft is committed to transparency in this work which is why we began publishing CSAF/VEX in October 2025. See this blog post for more information. If impact to additional products is identified, we will update the CVE to reflect this.
Mariner: Mariner
redhat: redhat
Customer Action Required:
Red Hat
grub2: reiserfs: Integer overflow when handling symlinks may lead to heap based out-of-bounds write when reading data
vendor_redhat·2025-02-18·CVSS 6.4
CVE-2025-0684 [MEDIUM] CWE-787 grub2: reiserfs: Integer overflow when handling symlinks may lead to heap based out-of-bounds write when reading data
grub2: reiserfs: Integer overflow when handling symlinks may lead to heap based out-of-bounds write when reading data
A flaw was found in grub2. When performing a symlink lookup from a reiserfs filesystem, grub's reiserfs fs module uses user-controlled parameters from the filesystem geometry to determine the internal buffer size, however, it improperly checks for integer overflows. A maliciouly crafted filesystem may lead some of those buffer size calculations to overflow, causing it to perform a grub_malloc() operation with a smaller size than expected. As a result, the grub_reiserfs_read_symlink() will call grub_reiserfs_read_real() with a overflown length parameter, leading to a heap based out-of-bounds write during data reading. This flaw may be leveraged to corrupt grub's internal cr
Debian
CVE-2025-0684: grub2 - A flaw was found in grub2. When performing a symlink lookup from a reiserfs file...
vendor_debian·2025·CVSS 6.4
CVE-2025-0684 [MEDIUM] CVE-2025-0684: grub2 - A flaw was found in grub2. When performing a symlink lookup from a reiserfs file...
A flaw was found in grub2. When performing a symlink lookup from a reiserfs filesystem, grub's reiserfs fs module uses user-controlled parameters from the filesystem geometry to determine the internal buffer size, however, it improperly checks for integer overflows. A maliciouly crafted filesystem may lead some of those buffer size calculations to overflow, causing it to perform a grub_malloc() operation with a smaller size than expected. As a result, the grub_reiserfs_read_symlink() will call grub_reiserfs_read_real() with a overflown length parameter, leading to a heap based out-of-bounds write during data reading. This flaw may be leveraged to corrupt grub's internal critical data and can result in arbitrary code execution, by-passing secure boot protections.
Scope: local
bookworm: open
Microsoft
Coreutils: heap overflow in split --line-bytes with very long lines
vendor_msrc·2024-02-13·CVSS 5.5
CVE-2024-0684 [MEDIUM] CWE-787 Coreutils: heap overflow in split --line-bytes with very long lines
Coreutils: heap overflow in split --line-bytes with very long lines
FAQ: Is Azure Linux the only Microsoft product that includes this open-source library and is therefore potentially affected by this vulnerability?
One of the main benefits to our customers who choose to use the Azure Linux distro is the commitment to keep it up to date with the most recent and most secure versions of the open source libraries with which the distro is composed. Microsoft is committed to transparency in this work which is why we began publishing CSAF/VEX in October 2025. See this blog post for more information. If impact to additional products is identified, we will update the CVE to reflect this.
Mariner: Mariner
fedora: fedora
Customer Action Required: Yes
Remediation: CBL-Mariner Releases
Reference:
GHSA
GHSA-mf4f-2vjv-3rq6: A flaw was found in grub2
ghsa_unreviewed·2025-03-03
CVE-2025-0684 [MEDIUM] CWE-787 GHSA-mf4f-2vjv-3rq6: A flaw was found in grub2
A flaw was found in grub2. When performing a symlink lookup from a reiserfs filesystem, grub's reiserfs fs module uses user-controlled parameters from the filesystem geometry to determine the internal buffer size, however, it improperly checks for integer overflows. A maliciouly crafted filesystem may lead some of those buffer size calculations to overflow, causing it to perform a grub_malloc() operation with a smaller size than expected. As a result, the grub_reiserfs_read_symlink() will call grub_reiserfs_read_real() with a overflown length parameter, leading to a heap based out-of-bounds write during data reading. This flaw may be leveraged to corrupt grub's internal critical data and can result in arbitrary code execution, by-passing secure boot protections.
OSV
CVE-2025-0684: A flaw was found in grub2
osv·2025-03-03·CVSS 6.4
CVE-2025-0684 [MEDIUM] CVE-2025-0684: A flaw was found in grub2
A flaw was found in grub2. When performing a symlink lookup from a reiserfs filesystem, grub's reiserfs fs module uses user-controlled parameters from the filesystem geometry to determine the internal buffer size, however, it improperly checks for integer overflows. A maliciouly crafted filesystem may lead some of those buffer size calculations to overflow, causing it to perform a grub_malloc() operation with a smaller size than expected. As a result, the grub_reiserfs_read_symlink() will call grub_reiserfs_read_real() with a overflown length parameter, leading to a heap based out-of-bounds write during data reading. This flaw may be leveraged to corrupt grub's internal critical data and can result in arbitrary code execution, by-passing secure boot protections.
No detection rules found.
No public exploits indexed.
2025-03-03
Published