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CVE-2021-37159 is a use-after-free and double-free vulnerability in the Linux kernel USB HSO network driver. In kernel versions through 5.13.4, hso_free_net_device() calls unregister_netdev() without first verifying that the network device is in the NETREG_REGISTERED state. Invoking unregistration for a device not in the registered state can result in incorrect lifetime management and freeing of already released objects.
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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.
6 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Linux kernel use-after-free in the HSO USB network driver.
Linux kernel use-after-free vulnerability in hso_free_net_device() in the USB HSO network driver.
Linux kernel use-after-free vulnerability in the USB HSO network driver.
Linux kernel use-after-free in hso_free_net_device() in the USB HSO network driver.
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.