CVE Vulnerability Advisory Database
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2021-07-07
Linux Kernel Netfilter x_tables Heap Out-of-Bounds Write Local Privilege Escalation (CVE-2021-22555) Analysis and Mitigation Guide
[Affected Scope] Linux Kernel versions since v2.6.19-rc1 that lack the official security patch, particularly environments with user namespaces enabled
[Impact] A local attacker can trigger heap memory corruption to escalate privileges to root or cause a system-wide Denial of Service (DoS)
[Mitigation] Upgrade the Linux kernel to the latest stable release, or apply temporary workarounds to restrict unprivileged user namespace creation