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CVE-2021-3759 is an uncontrolled resource-consumption vulnerability in the Linux kernel memory control group (memcg) subsystem. System V IPC semaphore objects created through repeated semget calls are not properly accounted to the applicable memory cgroup. A local user can therefore create unaccounted IPC objects that evade configured memcg memory limits, consuming host memory until an out-of-memory condition occurs.
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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 flaw in IPC-object accounting that permits bypass of memory-control-group limits and denial of service.
Linux kernel IPC accounting flaw allowing memory-control-group limits to be bypassed and causing denial of service.
Linux kernel IPC-accounting flaw that can bypass memory-control-group limits and cause denial of service.
Linux kernel IPC-object accounting flaw that can bypass memory-control-group limits and enable denial of service.
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.