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CVE-2026-49424 is an information-disclosure vulnerability in FreeBSD's Linux binary compatibility layer (Linuxulator). The Linux waitid() implementation translates a native FreeBSD siginfo_t structure into a stack-allocated Linux siginfo_t structure without first initializing the destination structure. Fields not populated during translation can retain kernel-stack contents and be exposed to an unprivileged caller.
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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.
If you can’t patch tonight, do this now.
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.
8 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An information-disclosure vulnerability in Linux waitid() in which an uninitialized stack-declared Linux siginfo_t structure can expose up to 104 bytes of kernel stack memory to an unprivileged user.
An information disclosure vulnerability in FreeBSD Linuxulator waitid() that leaks uninitialized kernel stack memory.
An information disclosure vulnerability in FreeBSD's Linuxulator where waitid() can leak 104 bytes of uninitialized kernel stack memory.
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.