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CVE-2026-49427 is a FreeBSD kernel memory-safety vulnerability in POSIX largepage shared memory object handling. According to the provided advisory context, pages belonging to largepage shared memory objects were not explicitly wired. When sendfile(2) transmitted such an object with the SF_NOCACHE flag, the kernel could free the underlying pages after transmission even though existing mappings still still referenced them. This creates a use-after-free condition in kernel memory management involving largepage-backed shared memory objects and the sendfile path.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
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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.
7 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A FreeBSD largepage handling vulnerability that can cause use-after-free conditions and may enable local privilege escalation.
A FreeBSD kernel memory-management vulnerability involving largepage handling that can lead to use-after-free conditions.
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.