Cyberdudebivash

 Published: Sept 2025 — Expanded analysis, detection, and mitigations Executive summary (expanded) CVE-2025-21692 is an out-of-bounds indexing bug in the Linux kernel’s ETS qdisc code path ( net/sched/ets.c ), specifically in ets_class_from_arg() . When fed a crafted class ID ( clid ) of 0 , the function may perform an OOB access, enabling memory corruption. Public exploit proofs-of-concept demonstrate that in many kernel builds this memory corruption can be turned into arbitrary kernel memory read/write, privilege escalation, and local code execution — enabling full host compromise, container escapes, or hypervisor compromise if host is a multi-tenant environment. Why this matters immediately: PoC code is public and mature. Attackers only need local code execution (a low bar in CI/build hosts, multi-tenant VPS, compromised user accounts). The exploit affects wide kernel ranges (many distros backported patches). Impact expands beyond LPE: container escapes, host tak...