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CVE-2021-45486 is an information-disclosure vulnerability in the Linux kernel IPv4 implementation. IPv4 ID generation initialized by ip_rt_init used an insufficiently large hash table, allowing collisions in shared IP ID counter state. A patient remote attacker can observe and influence IP ID allocation behavior to infer sensitive information from resulting counter changes. The issue affects Linux kernels before 5.12.4 and was addressed upstream beginning with Linux 5.13-rc1, with fixes backported to maintained distributions.
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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.
11 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An information-disclosure vulnerability in the Linux kernel IPv4 implementation.
An information-disclosure vulnerability in the Linux kernel IPv4 implementation.
Linux kernel information-disclosure vulnerability in the IPv4 implementation.
Linux kernel information-disclosure vulnerability in IPv4 handling.
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.