CyberRota Analysis
AI-GeneratedThe vulnerability affects the Linux kernel's handling of HSR (High-availability Seamless Redundancy) node management, specifically during the teardown process of node tables. An attacker could exploit this flaw to trigger a slab-use-after-free condition, potentially leading to arbitrary code execution or system crashes. Organizations utilizing Linux systems, especially those relying on HSR for network redundancy, should prioritize patching to mitigate the associated risks.
Original NVD Description
In the Linux kernel, the following vulnerability has been resolved: net: hsr: defer node table free until after RCU readers HSR node-list and node-status generic-netlink operations run under rcu_read_lock(). They walk hsr->node_db through hsr_get_next_node() and hsr_get_node_data(), but RTM_DELLINK teardown removes the same node table with plain list_del() and frees each node immediately. That lets a generic-netlink reader hold a struct hsr_node pointer across hsr_dellink(). In a KASAN build, widening the reader window after hsr_get_next_node() obtains the node reproduces a slab-use-after-free when the reader copies node->macaddress_A; the freeing stack is hsr_del_nodes() from hsr_dellink(). Use list_del_rcu() and defer the free through the existing hsr_free_node_rcu() callback. This matches the lifetime rule used by the HSR prune paths, which already delete nodes with list_del_rcu() and call_rcu().
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