Red Hat: CVE-2024-46858: kernel: mptcp: pm: Fix uaf in __timer_delete_sync (Multiple Advisories)

Red Hat: CVE-2024-46858: kernel: mptcp: pm: Fix uaf in __timer_delete_sync (Multiple Advisories)

Severity

6

CVSS

(AV:L/AC:H/Au:S/C:C/I:C/A:C)

Published

09/27/2024

Created

11/15/2024

Added

11/14/2024

Modified

02/10/2025

Description

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_pollnetlink_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_rcvmptcp_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.

Solution(s)

• redhat-upgrade-kernel
• redhat-upgrade-kernel-rt

References

• CVE-2024-46858
• RHSA-2024:10262
• RHSA-2024:10281
• RHSA-2024:9497
• RHSA-2024:9498
• RHSA-2024:9546
• RHSA-2024:9605

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