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CVE-2025-0685 is an integer-overflow vulnerability in GRUB2's JFS filesystem module. While processing JFS filesystem geometry during file reads, GRUB derives internal buffer sizes from filesystem-controlled values without correctly detecting arithmetic overflow. This can cause GRUB to allocate a buffer smaller than required. During symlink lookup, grub_jfs_lookup_symlink() can subsequently write beyond that allocation while grub_jfs_read_file() processes the crafted filesystem data, producing a heap-based out-of-bounds write.
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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-2026-3420 security update affecting listed GRUB2 packages.
A vulnerability addressed by the EulerOS SA-2026-3507 GRUB2 package update.
A GRUB2 JFS filesystem integer overflow in symlink/data handling that can lead to heap out-of-bounds write and possible arbitrary code execution.
A GRUB JFS filesystem integer overflow in symlink/data handling that can lead to heap-based out-of-bounds writes and possible arbitrary code execution.
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Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.