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().
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
b9a1e627405d68d475a3c1f35e685ccfb5bbe668 to < 0ea70fb46940620848c08d9d399455c9e82fecdbaffectedb9a1e627405d68d475a3c1f35e685ccfb5bbe668 to < 8be6685cdd1255bcc85f9b59e4bfc313aefc5c1baffectedb9a1e627405d68d475a3c1f35e685ccfb5bbe668 to < c5580114e0492bcd2e0a37613ed4c311e3fa3d4daffectedb9a1e627405d68d475a3c1f35e685ccfb5bbe668 to < 7713f4aafb577ff49fa67f0488d9c7dddc64d6ceaffectedb9a1e627405d68d475a3c1f35e685ccfb5bbe668 to < 6324423a8e6591f41a16c09a8f9a84e554ac147caffectedb9a1e627405d68d475a3c1f35e685ccfb5bbe668 to < 48d09dea506de667eb55f939bf98eec721effbdbaffectedb9a1e627405d68d475a3c1f35e685ccfb5bbe668 to < 8c3af18bb0d7c921a5219194037509463eb2ffdeaffectedb9a1e627405d68d475a3c1f35e685ccfb5bbe668 to < aaec7096f9961eb223b5b149abe9495525c205d9affected08523d5a2f4a9e4202e00d282c164d453cabe2d2affected5.2.12 to < 5.3affected
Linux Linux
Default version status: affected
5.3affected0 to < 5.3unaffected5.10.259 to ≤ 5.10.*unaffected5.15.210 to ≤ 5.15.*unaffected6.1.176 to ≤ 6.1.*unaffected6.6.143 to ≤ 6.6.*unaffected6.12.93 to ≤ 6.12.*unaffected6.18.57 to ≤ 6.18.*unaffected7.0.11 to ≤ 7.0.*unaffected7.1 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/0ea70fb46940620848c08d9d399455c9e82fecdb ↗
- https://git.kernel.org/stable/c/8be6685cdd1255bcc85f9b59e4bfc313aefc5c1b ↗
- https://git.kernel.org/stable/c/c5580114e0492bcd2e0a37613ed4c311e3fa3d4d ↗
- https://git.kernel.org/stable/c/7713f4aafb577ff49fa67f0488d9c7dddc64d6ce ↗
- https://git.kernel.org/stable/c/6324423a8e6591f41a16c09a8f9a84e554ac147c ↗
- https://git.kernel.org/stable/c/48d09dea506de667eb55f939bf98eec721effbdb ↗
- https://git.kernel.org/stable/c/8c3af18bb0d7c921a5219194037509463eb2ffde ↗
- https://git.kernel.org/stable/c/aaec7096f9961eb223b5b149abe9495525c205d9 ↗