CVE-2025-0685
published 2025-03-03CVE-2025-0685: A flaw was found in grub2. When reading data from a jfs filesystem, grub's jfs filesystem module uses user-controlled parameters from the filesystem geometry…
PriorityP433medium6.4CVSS 3.1
AVLACHPRHUINSUCHIHAH
EPSS
0.27%
18.8th percentile
A flaw was found in grub2. When reading data from a jfs filesystem, grub's jfs filesystem 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_jfs_lookup_symlink() function will write past the internal buffer length during grub_jfs_read_file(). This issue can be leveraged to corrupt grub's internal critical data and may result in arbitrary code execution, by-passing secure boot protections.
Affected
9 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_grub2_2.06-24_on_azure_linux_3.0 | — | — |
| msrc | azl3_grub2_2.06-25_on_azure_linux_3.0 | — | — |
| msrc | cbl2_grub2_2.06-14_on_cbl_mariner_2.0 | — | — |
| msrc | cbl2_grub2_2.06-15_on_cbl_mariner_2.0 | — | — |
| msrc | cbl2_vim_8.2.4743-1_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_msrc7.8HIGH
vendor_debian6.4MEDIUM
vendor_redhat6.4MEDIUM
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OSV
CVE-2025-0685: A flaw was found in grub2
osv·2025-03-03·CVSS 6.4
CVE-2025-0685 [MEDIUM] CVE-2025-0685: A flaw was found in grub2
A flaw was found in grub2. When reading data from a jfs filesystem, grub's jfs filesystem 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_jfs_lookup_symlink() function will write past the internal buffer length during grub_jfs_read_file(). This issue can be leveraged to corrupt grub's internal critical data and may result in arbitrary code execution, by-passing secure boot protections.
GHSA
GHSA-37r5-v3hg-cg4r: A flaw was found in grub2
ghsa_unreviewed·2025-03-03
CVE-2025-0685 [MEDIUM] CWE-787 GHSA-37r5-v3hg-cg4r: A flaw was found in grub2
A flaw was found in grub2. When reading data from a jfs filesystem, grub's jfs filesystem 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_jfs_lookup_symlink() function will write past the internal buffer length during grub_jfs_read_file(). This issue can be leveraged to corrupt grub's internal critical data and may result in arbitrary code execution, by-passing secure boot protections.
Microsoft
Grub2: jfs: 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-2025-0685 [MEDIUM] CWE-787 Grub2: jfs: integer overflow when handling symlinks may lead to heap based out-of-bounds write when reading data
Grub2: jfs: 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: Yes
Red Hat
grub2: jfs: 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-2025-0685 [MEDIUM] CWE-787 grub2: jfs: Integer overflow when handling symlinks may lead to heap based out-of-bounds write when reading data
grub2: jfs: Integer overflow when handling symlinks may lead to heap based out-of-bounds write when reading data
A flaw was found in grub2. When reading data from a jfs filesystem, grub's jfs filesystem 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_jfs_lookup_symlink() function will write past the internal buffer length during grub_jfs_read_file(). This issue can be leveraged to corrupt grub's internal critical data and may result in arbitrary code execution, by-passing secure boot
Debian
CVE-2025-0685: grub2 - A flaw was found in grub2. When reading data from a jfs filesystem, grub's jfs f...
vendor_debian·2025·CVSS 6.4
CVE-2025-0685 [MEDIUM] CVE-2025-0685: grub2 - A flaw was found in grub2. When reading data from a jfs filesystem, grub's jfs f...
A flaw was found in grub2. When reading data from a jfs filesystem, grub's jfs filesystem 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_jfs_lookup_symlink() function will write past the internal buffer length during grub_jfs_read_file(). This issue can be leveraged to corrupt grub's internal critical data and may result in arbitrary code execution, by-passing secure boot protections.
Scope: local
bookworm: open
bullseye: open
forky: resolved (fixed in 2.12-6)
sid: resolved (fixed in
Microsoft
Use of Out-of-range Pointer Offset in vim/vim
vendor_msrc·2022-02-08·CVSS 7.8
CVE-2022-0685 [HIGH] CWE-823 Use of Out-of-range Pointer Offset in vim/vim
Use of Out-of-range Pointer Offset in vim/vim
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
@huntrdev: @huntrdev
Customer Action Required: Yes
Remediation: CBL-Mariner Releases
Reference: https://learn.m
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2025-03-03
Published