Linux Kernel Vulnerability in NDIS: Potential Unintentional Access Issues

CVE-2025-21760

What is CVE-2025-21760?

A vulnerability has been identified in the Linux kernel's NDIS subsystem where the ndisc_send_skb() function can be invoked without proper Real-Time Networking Layer (RTNL) or Read-Copy-Update (RCU) protections. This oversight may lead to unintended memory access, specifically a potential Use After Free (UAF) condition. The issue has been mitigated by adjusting the placement of the rcu_read_lock() to ensure it is acquired earlier, thereby enabling safer usage of the dev_net_rcu() function and reducing the risk of memory corruption or unauthorized access.

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