CVE-2025-0678
published 2025-03-03CVE-2025-0678: A flaw was found in grub2. When reading data from a squash4 filesystem, grub's squash4 fs module uses user-controlled parameters from the filesystem geometry…
PriorityP345high7.8CVSS 3.1
AVLACLPRLUINSUCHIHAH
EPSS
0.27%
19.5th percentile
A flaw was found in grub2. When reading data from a squash4 filesystem, grub's squash4 fs module uses user-controlled parameters from the filesystem geometry to determine the internal buffer size, however, it improperly checks for integer overflows. A maliciously 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 direct_read() will perform a heap based out-of-bounds write during data reading. This flaw may be leveraged to corrupt grub's internal critical data and may 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_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 | — | — |
| redhat | enterprise_linux | — | — |
| redhat | enterprise_linux | — | — |
| redhat | enterprise_linux | — | — |
| redhat | openshift_container_platform | — | — |
CVSS provenance
nvdv3.17.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
osv7.8HIGH
vendor_debian7.8HIGH
vendor_redhat7.8HIGH
vendor_msrc6.4MEDIUM
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Microsoft
Grub2: squash4: integer overflow may lead to heap based out-of-bounds write when reading data
vendor_msrc·2025-03-11·CVSS 6.4
CVE-2025-0678 [HIGH] CWE-190 Grub2: squash4: integer overflow may lead to heap based out-of-bounds write when reading data
Grub2: squash4: integer overflow 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
Remediation: CBL-Ma
Red Hat
grub2: squash4: Integer overflow may lead to heap based out-of-bounds write when reading data
vendor_redhat·2025-02-18·CVSS 7.8
CVE-2025-0678 [HIGH] CWE-190 grub2: squash4: Integer overflow may lead to heap based out-of-bounds write when reading data
grub2: squash4: Integer overflow may lead to heap based out-of-bounds write when reading data
A flaw was found in grub2. When reading data from a squash4 filesystem, grub's squash4 fs module uses user-controlled parameters from the filesystem geometry to determine the internal buffer size, however, it improperly checks for integer overflows. A maliciously 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 direct_read() will perform a heap based out-of-bounds write during data reading. This flaw may be leveraged to corrupt grub's internal critical data and may result in arbitrary code execution, by-passing secure boot protections.
A flaw was found in grub2. When
Debian
CVE-2025-0678: grub2 - A flaw was found in grub2. When reading data from a squash4 filesystem, grub's s...
vendor_debian·2025·CVSS 7.8
CVE-2025-0678 [HIGH] CVE-2025-0678: grub2 - A flaw was found in grub2. When reading data from a squash4 filesystem, grub's s...
A flaw was found in grub2. When reading data from a squash4 filesystem, grub's squash4 fs module uses user-controlled parameters from the filesystem geometry to determine the internal buffer size, however, it improperly checks for integer overflows. A maliciously 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 direct_read() will perform a heap based out-of-bounds write during data reading. This flaw may 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 2.12-6)
trixie: resolved (
GHSA
GHSA-q67r-p3hc-x2w9: A flaw was found in grub2
ghsa_unreviewed·2025-03-03
CVE-2025-0678 [MEDIUM] CWE-190 GHSA-q67r-p3hc-x2w9: A flaw was found in grub2
A flaw was found in grub2. When reading data from a squash4 filesystem, grub's squash4 fs module uses user-controlled parameters from the filesystem geometry to determine the internal buffer size, however, it improperly checks for integer overflows. A maliciously 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 direct_read() will perform a heap based out-of-bounds write during data reading. This flaw may be leveraged to corrupt grub's internal critical data and may result in arbitrary code execution, by-passing secure boot protections.
OSV
CVE-2025-0678: A flaw was found in grub2
osv·2025-03-03·CVSS 7.8
CVE-2025-0678 [HIGH] CVE-2025-0678: A flaw was found in grub2
A flaw was found in grub2. When reading data from a squash4 filesystem, grub's squash4 fs module uses user-controlled parameters from the filesystem geometry to determine the internal buffer size, however, it improperly checks for integer overflows. A maliciously 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 direct_read() will perform a heap based out-of-bounds write during data reading. This flaw may be leveraged to corrupt grub's internal critical data and may result in arbitrary code execution, by-passing secure boot protections.
No detection rules found.
No public exploits indexed.
2025-03-03
Published