#VU104085 Integer overflow in grub - CVE-2025-0686

Vulnerability identifier: #VU104085

Vulnerability risk: Low

CVSSv4.0: 4 [CVSS:4.0/AV:L/AC:H/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2025-0686

CWE-ID: CWE-190

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
grub
Universal components / Libraries / Libraries used by multiple products

Vendor: GNU

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to integer overflow within the grub_romfs_read_symlink() function when performing a symlink lookup from a romfs filesystem. A local user can trigger an integer overflow and execute arbitrary code with elevated privileges.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

grub: 2.00 - 2.12

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External links
https://lists.gnu.org/archive/html/grub-devel/2025-02/msg00024.html

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Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.