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CVE-2021-47495 is a divide-by-zero vulnerability in the Linux kernel usbnet subsystem. usbnet processing could accept a maximum USB packet-size value of zero and subsequently divide by that value, causing a kernel oops. The upstream fix adds validation that rejects a zero maxpacket value.
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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.
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.
9 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An input-validation issue in the Linux kernel USB networking subsystem's maxpacket handling.
Linux kernel usbnet vulnerability addressed by validating the maximum packet size.
Linux kernel USB network driver maximum-packet-size validation vulnerability.
Linux kernel USB network-driver maximum-packet validation flaw.
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.