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CVE-2021-4197 is an improper privilege-management flaw in Linux kernel cgroup migration permission checks affecting both cgroup v1 and cgroup v2. The kernel evaluated credentials and namespace context at write time rather than preserving the credentials and namespace associated with opening the cgroup control-file descriptor. Consequently, a less-privileged process could create a descriptor and induce a more-privileged process to write through it, causing the operation to be authorized using the latter process's privileges. The upstream correction uses open-time credentials and namespace information for migration permission checks.
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No public exploit code observed for this vulnerability.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
13 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.