CVE-2026-64123

CVE CVE-2026-64123EUVD EUVD-2026-45808Published 2026-07-19T15:40:21.000ZLast changed 2026-08-05T12:39:29.000ZCVSS 7.8

What the advisory describes

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().

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

Linux — Linux patch: 6.12.93; patch: 0; b9a1e627405d68d475a3c1f35e685ccfb5bbe668 <aaec7096f9961eb223b5b149abe9495525c205d9; b9a1e627405d68d475a3c1f35e685ccfb5bbe668 <6324423a8e6591f41a16c09a8f9a84e554ac147c; 08523d5a2f4a9e4202e00d282c164d453cabe2d2; 5.2.12 <5.3; b9a1e627405d68d475a3c1f35e685ccfb5bbe668 <8be6685cdd1255bcc85f9b59e4bfc313aefc5c1b; b9a1e627405d68d475a3c1f35e685ccfb5bbe668 <7713f4aafb577ff49fa67f0488d9c7dddc64d6ce; patch: 5.10.259; b9a1e627405d68d475a3c1f35e685ccfb5bbe668 <8c3af18bb0d7c921a5219194037509463eb2ffde; b9a1e627405d68d475a3c1f35e685ccfb5bbe668 <0ea70fb46940620848c08d9d399455c9e82fecdb; 5.3; patch: 6.6.143; patch: 7.1; patch: 6.1.176; b9a1e627405d68d475a3c1f35e685ccfb5bbe668 <c5580114e0492bcd2e0a37613ed4c311e3fa3d4d; patch: 7.0.11; patch: 5.15.210

The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.

Carried in the product catalogue

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Linux — Linux

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