CVE-2021-4002: Debian Linux

Medium severity, CVSS 4.4. EPSS: 0.5% chance of exploitation in the next 30 days.

A memory leak flaw in the Linux kernel's hugetlbfs memory usage was found in the way the user maps some regions of memory twice using shmget() which are aligned to PUD alignment with the fault of some of the memory pages. A local user could use this flaw to get unauthorized access to some data.

Affected products

• Debian Debian Linux: version 9.0 only; version 10.0 only
• Fedoraproject Fedora: version 35 only
• Linux Linux Kernel: before 5.16 (fixed in 5.16); version 5.16 only
• Oracle Communications Cloud Native Core Binding Support Function: version 22.1.3 only
• Oracle Communications Cloud Native Core Network Exposure Function: version 22.1.1 only
• Oracle Communications Cloud Native Core Policy: version 22.2.0 only

Published 2022-03-03. Last modified 2026-06-17.