{"id":"CVE-2021-4204","title":"An out-of-bounds (OOB) memory access flaw was found in the Linux kernel's eBPF due to an Improper Input Validation","summary":"An out-of-bounds (OOB) memory access flaw was found in the Linux kernel's eBPF due to an Improper Input Validation. This flaw allows a local attacker with a special privilege to crash the system or leak internal information.","severity":"none","cwe":["CWE-20"],"product":"kernel","affected":["kernel Affects Linux kernel v5.8 or later"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-10-08T21:05:08.422710Z"},"exploitAvailable":true,"published":"2022-08-24","updated":"2026-11-02","sourceUpdated":"2026-11-02T18:11:10.668Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2021-4204","references":[{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2039178"},{"url":"https://access.redhat.com/security/cve/CVE-2021-4204"},{"url":"https://www.openwall.com/lists/oss-security/2022/01/11/4"},{"url":"https://security-tracker.debian.org/tracker/CVE-2021-4204"},{"url":"https://security.netapp.com/advisory/ntap-20221228-0003/"}],"tags":["cve.org","exploit-available"],"epss":0.01245,"epssPercentile":0.69375,"exploits":{"github":1,"githubRepos":["https://github.com/tr3ee/CVE-2021-4204"],"checkedAt":"2026-11-05T19:31:18.369Z"},"ingestedAt":"2026-11-05T19:30:42.768Z","slug":"CVE-2021-4204","body":"## Overview\n\nAn out-of-bounds (OOB) memory access flaw was found in the Linux kernel's eBPF due to an Improper Input Validation. This flaw allows a local attacker with a special privilege to crash the system or leak internal information.\n\n## Affected\n\n- `kernel Affects Linux kernel v5.8 or later`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":15,"depthScoreParts":{"impact":2.8,"likelihood":0.2,"exploitation":12,"ransomware":0},"changes":[]}