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CVE-2021-3669 is a flaw in the Linux kernel's handling of shared memory usage measurement. When the system has a large number of shared memory segments, the mechanism for measuring their usage does not scale efficiently. This can result in excessive resource consumption by the kernel, potentially leading to resource exhaustion and a denial of service (DoS) condition.
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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.
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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.
7 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Linux kernel shared-memory enumeration scalability vulnerability that can cause denial of service.
Linux kernel scalability issue in /proc/sysvipc/shm handling of large shared-memory segment counts.
Linux kernel denial-of-service issue caused by non-scaling reads of /proc/sysvipc/shm with many shared-memory segments.
Linux kernel denial-of-service/scalability issue in /proc/sysvipc/shm handling with many shared-memory segments.
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.