simplysecuregroup.com • 3h
Linux Kernel: Critical Local Privilege Escalation via Bad Epoll CVE-2026-46242
CVE-2026-46242, dubbed "Bad Epoll," is a critical local privilege escalation (LPE) vulnerability residing in the Linux kernel's epoll subsystem within fs/eventpoll.c. The flaw allows an unprivileged local attacker to trigger a memory corruption primitive, granting full root-level access to the host system. This vulnerability impacts a vast ecosystem, including enterprise Linux servers, desktop distributions, and the Android mobile operating system. Remediation requires applying the official patches from the Linux kernel stable tree. This case notably highlights the limitations of AI-driven vulnerability research, as the 'Mythos' AI model failed to detect this specific flaw despite auditing the same code segment.