cve 2025 40075

CVE-2025-40075 is a Linux kernel vulnerability in the TCP metrics code that arises from a timing and synchronization gap when reading the dst_dev pointer without proper RCU protection. The fix replaces direct dst_dev reads with the RCU-aware helper dst_dev_net_rcu in net/ipv4/tcp_metrics.c, preventing potential crashes or memory-safety issues in concurrent scenarios. This patch has been merged into stable kernels, and administrators and kernel integrators should validate and deploy the update to affected systems. The vulnerability is specific to the Linux networking stack and does not directly impact Windows systems, but it is relevant for IT professionals managing mixed environments or Linux-based infrastructure.