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CVE-2026-63807 is an out-of-bounds read in the Linux kernel KVM x86 shadow-MMU hugepage-recovery path. When recovering a direct shadow page as a hugepage, KVM queried the target memslot's maximum mapping level using the shadow page base guest frame number before verifying that the base GFN belonged to that memslot. A guest hugepage mapping that extends below a memslot boundary can therefore leave the parent shadow page with an out-of-range GFN. Accessing hugepage metadata for that GFN indexes the memslot lpage_info array out of bounds. The fix validates that the base GFN is in the target memslot before determining the maximum mapping level.
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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.
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.