Heads up, Linux folks: a new local privilege escalation issue—“Bad Epoll”—has resurfaced and it’s hitting systems even after kernel upgrades. Tracked as CVE-2026-46242, it’s a race-condition bug that boils down to a Use-After-Free (UAF). In plain terms: the kernel can free a memory object under specific trigger timing, then later access it again—opening a path for an attacker starting from an unprivileged process to gradually gain root-level control. Risk assessment puts it at a high severity tier: CVSS 7.8. Notably, it’s not limited to desktop or server Linux. Some Android devices may be affected too, depending on their kernel version. What matters most: - The bug centers around Linux 6.4+ (older kernels up to 6.1 aren’t affected). - “Looks patched” isn’t enough—some distros may not backport the fix correctly. Mitigation: apply the published kernel updates ASAP (epoll can’t realistically be “disabled” without breaking common workloads like Nginx/Redis/HAProxy). Also watch for related epoll evolution: CVE-2026-43074 is moving through the fix pipeline. #LinuxSecurity #CVE #KernelExploit #BugBounty #PrivEsc #AndroidSecurity
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