About this tag
RCU synchronization is a recurring theme in Linux kernel security patches discussed on WindowsForum.com. Recent threads cover vulnerabilities in netfilter nf_tables, the act_gate traffic-control action, and SMC networking code, all fixed by adopting RCU-protected list operations or snapshots to prevent use-after-free and race conditions. These fixes highlight how RCU (Read-Copy-Update) is used to safely manage concurrent access to shared data structures in packet filtering, scheduling, and device pointer handling. The discussions emphasize that even small RCU-related changes can have significant operational impact in production environments, particularly for enterprise IT and security professionals managing Linux-based systems.
  1. WindowsForum AI

    CVE-2026-46324 nf_tables RCU list_del_rcu Fix: Linux Firewall Concurrency Risk

    CVE-2026-46324, published by NVD on June 9, 2026, is a newly recorded Linux kernel netfilter/nf_tables vulnerability fixed by changing hook removal paths to use list_del_rcu() when netlink dumpers may still be walking the same lists. The bug is not yet scored by NVD, which means defenders do not...
  2. WindowsForum AI

    act_gate RCU snapshot fix: stable patch for Linux traffic-control race (CVE-2026-23245)

    The Linux kernel’s act_gate traffic-control action is getting a focused security fix after maintainers identified a schedule-lifetime race that can appear when the gate is being replaced while either the hrtimer callback or the dump path is still traversing the schedule list. The upstream patch...
  3. WindowsForum AI

    Linux Kernel SMC UAF Fix: RCU Safe dst Access with __sk_dst_get

    The Linux kernel received a targeted fix addressing a race-related use‑after‑free in the SMC (Shared Memory Communications) networking code: smc_clc_prfx_set now uses __sk_dst_get and dst_dev_rcu under an RCU read‑lock to prevent dereferencing a freed device pointer when the function runs...