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CVE-2021-46915 is a denial-of-service vulnerability in the Linux kernel Netfilter nft_limit expression initialization routine. The routine used div_u64(), which performs 64-bit-by-32-bit division, for an operation requiring a 64-bit divisor. Truncation of a supplied 64-bit divisor can yield zero and trigger a CPU divide-error exception while nftables expressions are processed through Netlink. The correction replaces div_u64() with div64_u64().
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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.
5 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A divide-error vulnerability in the Linux kernel Netfilter nft_limit_init() function.
A divide-error vulnerability in the Linux kernel Netfilter nft_limit_init function, fixed by the kernel-rt update.
A divide-error vulnerability in the Linux kernel Netfilter nft_limit_init function.
A divide-error flaw in the Linux kernel Netfilter nft_limit_init function, addressed in Red Hat kernel-rt packages.
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.