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CVE-2025-0686 is an integer-overflow vulnerability in GRUB2's ROMFS filesystem module during symbolic-link lookup. GRUB derives internal buffer sizes from filesystem geometry values controlled by a ROMFS image but does not correctly validate arithmetic overflow. An overflow can cause allocation of a buffer smaller than required; subsequent symlink data reads through grub_disk_read() can write beyond that allocation.
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What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
4 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A vulnerability addressed by the EulerOS SA-2026-3507 GRUB2 package update.
A vulnerability addressed by the EulerOS SA-2026-3420 security update affecting listed GRUB2 packages.
A GRUB2 romfs symlink handling integer overflow that can trigger heap out-of-bounds writes and potentially arbitrary code execution.
A GRUB romfs symlink handling integer overflow that can trigger heap-based out-of-bounds writes and potentially arbitrary code execution.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.