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CVE-2021-4197 is a vulnerability in the Linux kernel's control groups (cgroups) and namespaces subsystem, affecting both cgroup1 and cgroup2. The flaw allows an unprivileged user to write to a file handler in such a way that, due to improper access controls, they can affect processes with higher privileges that are managed by cgroups. This can be exploited by a local attacker to crash the system or escalate privileges.
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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.
10 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Linux kernel cgroup permission-check flaw involving credentials and namespaces during migration.
Linux kernel cgroup permissions flaw concerning credentials and namespaces used for migration checks.
Linux kernel cgroup permissions flaw involving migration checks and credentials/namespaces.
Linux kernel cgroup permission-check flaw involving credentials and namespaces used for migration.
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.