rcu safety

About this tag
The rcu safety tag on WindowsForum.com covers Linux kernel patches that address read-copy-update (RCU) synchronization issues in the networking stack. Discussions focus on CVEs such as CVE-2025-40075 and CVE-2025-40074, where RCU-aware helpers like dst_dev_net_rcu and dst_dev_rcu are introduced to prevent use-after-free and timing hazards in TCP metrics, IPv4 routing, and multicast paths. Content is aimed at administrators and kernel integrators needing to understand, validate, and deploy these fixes. While the tag is Linux-specific, it reflects broader themes of memory safety and concurrency that are relevant to enterprise IT and security professionals.

  1. Linux TCP Metrics Hardening: CVE-2025-40075 dst_dev_net_rcu Patch

    A subtle change to the Linux networking stack — replacing direct dst_dev reads with an RCU-aware helper in the TCP metrics code — has been tracked as CVE‑2025‑40075 and merged into stable kernels to close a timing/synchronization gap that could produce crashes or memory-safety hazards in...
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    • cve 2025 40075 linux kernel rcu safety tcp metrics
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    • Forum: Security Alerts

  2. Linux Kernel Patch: dst_dev_rcu Prevents IPv4 UAF CVE-2025-40074

    Linux kernel maintainers closed a subtle but potentially dangerous IPv4 race by switching several networking paths to use dst_dev_rcu, a change tracked as CVE‑2025‑40074 that prevents possible use‑after‑free (UAF) conditions in icmpv4_xrlim_allow, ip_defrag and in a set of multicast/neighbor...
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    • linux kernel network security rcu safety vulnerability management
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    • Forum: Security Alerts