mptcp：pm：修复 __timer_delete_sync 中的 uaf（CVE-2024-46858）
CVE编号
CVE-2024-46858利用情况
暂无补丁情况
N/A披露时间
2024-09-27漏洞描述
In the Linux kernel, the following vulnerability has been resolved: mptcp: pm: Fix uaf in __timer_delete_sync There are two paths to access mptcp_pm_del_add_timer, result in a race condition: CPU1 CPU2 ==== ==== net_rx_action napi_poll netlink_sendmsg __napi_pollnetlink_unicast process_backlognetlink_unicast_kernel __netif_receive_skbgenl_rcv __netif_receive_skb_one_core netlink_rcv_skb NF_HOOKgenl_rcv_msg ip_local_deliver_finishgenl_family_rcv_msg ip_protocol_deliver_rcugenl_family_rcv_msg_doit tcp_v4_rcv mptcp_pm_nl_flush_addrs_doit tcp_v4_do_rcv mptcp_nl_remove_addrs_list tcp_rcv_establishedmptcp_pm_remove_addrs_and_subflows tcp_data_queue remove_anno_list_by_saddr mptcp_incoming_options mptcp_pm_del_add_timer mptcp_pm_del_add_timer kfree(entry) In remove_anno_list_by_saddr(running on CPU2), after leaving the critical zone protected by "pm.lock", the entry will be released, which leads to the occurrence of uaf in the mptcp_pm_del_add_timer(running on CPU1). Keeping a reference to add_timer inside the lock, and calling sk_stop_timer_sync() with this reference, instead of "entry->add_timer". Move list_del(&entry->list) to mptcp_pm_del_add_timer and inside the pm lock, do not directly access any members of the entry outside the pm lock, which can avoid similar "entry->x" uaf.解决建议
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