{"id":"CVE-2021-3759","title":"A memory overflow vulnerability was found in the Linux kernel’s ipc functionality of the memcg subsystem, in the way a user calls the semget function multiple times, creating semaphores","summary":"A memory overflow vulnerability was found in the Linux kernel’s ipc functionality of the memcg subsystem, in the way a user calls the semget function multiple times, creating semaphores. This flaw allows a local user to starve the resour…","severity":"medium","cvss":5.5,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-400","CWE-770"],"vendor":"linux","product":"linux_kernel","affected":["linux_kernel","debian_linux = 10.0"],"published":"2022-08-23","updated":"2026-10-14","sourceUpdated":"2026-10-14T10:17:48.563","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2021-3759","references":[{"url":"https://access.redhat.com/security/cve/CVE-2021-3759","label":"secalert@redhat.com"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=1999675","label":"secalert@redhat.com"},{"url":"https://lists.debian.org/debian-lts-announce/2022/12/msg00031.html","label":"secalert@redhat.com"},{"url":"https://lore.kernel.org/linux-mm/1626333284-1404-1-git-send-email-nglaive%40gmail.com/","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/security/cve/CVE-2021-3759","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=1999675","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.debian.org/debian-lts-announce/2022/12/msg00031.html","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lore.kernel.org/linux-mm/1626333284-1404-1-git-send-email-nglaive%40gmail.com/","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-794697.html","label":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"}],"tags":["nvd"],"epss":0.0036,"epssPercentile":0.27954,"ingestedAt":"2026-10-14T10:25:41.193Z","slug":"CVE-2021-3759","body":"## Overview\n\nA memory overflow vulnerability was found in the Linux kernel’s ipc functionality of the memcg subsystem, in the way a user calls the semget function multiple times, creating semaphores. This flaw allows a local user to starve the resources, causing a denial of service. The highest threat from this vulnerability is to system availability.\n\n## Affected\n\n- `linux_kernel`\n- `debian_linux = 10.0`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}