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_poll netlink_sendmsg __napi_poll netlink_unicast process_backlog netlink_unicast_kernel __netif_receive_skb genl_rcv __netif_receive_skb_one_core netlink_rcv_skb NF_HOOK genl_rcv_msg ip_local_deliver_finish genl_family_rcv_msg ip_protocol_deliver_rcu genl_family_rcv_msg_doit tcp_v4_rcv mptcp_pm_nl_flush_addrs_doit tcp_v4_do_rcv mptcp_nl_remove_addrs_list tcp_rcv_established mptcp_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.
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
00cfd77b9063dcdf3628a7087faba60de85a9cc8 to < 0e7814b028cd50b3ff79659d23dfa9da6a1e75e1affected00cfd77b9063dcdf3628a7087faba60de85a9cc8 to < 3554482f4691571fc4b5490c17ae26896e62171caffected00cfd77b9063dcdf3628a7087faba60de85a9cc8 to < 67409b358500c71632116356a0b065f112d7b707affected00cfd77b9063dcdf3628a7087faba60de85a9cc8 to < 6452b162549c7f9ef54655d3fb9977b9192e6e5baffected00cfd77b9063dcdf3628a7087faba60de85a9cc8 to < 12134a652b0a10064844ea235173e70246eba6dcaffected00cfd77b9063dcdf3628a7087faba60de85a9cc8 to < b4cd80b0338945a94972ac3ed54f8338d2da2076affected
Linux Linux
Default version status: affected
5.10affected0 to < 5.10unaffected5.10.227 to ≤ 5.10.*unaffected5.15.168 to ≤ 5.15.*unaffected6.1.111 to ≤ 6.1.*unaffected6.6.52 to ≤ 6.6.*unaffected6.10.11 to ≤ 6.10.*unaffected6.11 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/0e7814b028cd50b3ff79659d23dfa9da6a1e75e1 ↗
- https://git.kernel.org/stable/c/3554482f4691571fc4b5490c17ae26896e62171c ↗
- https://git.kernel.org/stable/c/67409b358500c71632116356a0b065f112d7b707 ↗
- https://git.kernel.org/stable/c/6452b162549c7f9ef54655d3fb9977b9192e6e5b ↗
- https://git.kernel.org/stable/c/12134a652b0a10064844ea235173e70246eba6dc ↗
- https://git.kernel.org/stable/c/b4cd80b0338945a94972ac3ed54f8338d2da2076 ↗
- https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html ↗
- https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html ↗