CVE-2025-0686 — Out-of-bounds Write in Grub2
Severity
6.4MEDIUMNVD
EPSS
0.1%
top 81.93%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
Timeline
PublishedMar 3
Latest updateMar 11
Description
A flaw was found in grub2. When performing a symlink lookup from a romfs filesystem, grub's romfs filesystem 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 grub_romfs_read_symlink() may cause o…
CVSS vector
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:HExploitability: 0.5 | Impact: 5.9
🔴Vulnerability Details
3📋Vendor Advisories
3Microsoft▶
Grub2: romfs: integer overflow when handling symlinks may lead to heap based out-of-bounds write when reading dat↗2025-03-11
Red Hat▶
grub2: romfs: Integer overflow when handling symlinks may lead to heap based out-of-bounds write when reading dat↗2025-02-18
Debian▶
CVE-2025-0686: grub2 - A flaw was found in grub2. When performing a symlink lookup from a romfs filesys...↗2025