{"id":"CVE-2024-46858","summary":"mptcp: pm: Fix uaf in __timer_delete_sync","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nmptcp: pm: Fix uaf in __timer_delete_sync\n\nThere are two paths to access mptcp_pm_del_add_timer, result in a race\ncondition:\n\n     CPU1\t\t\t\tCPU2\n     ====                               ====\n     net_rx_action\n     napi_poll                          netlink_sendmsg\n     __napi_poll                        netlink_unicast\n     process_backlog                    netlink_unicast_kernel\n     __netif_receive_skb                genl_rcv\n     __netif_receive_skb_one_core       netlink_rcv_skb\n     NF_HOOK                            genl_rcv_msg\n     ip_local_deliver_finish            genl_family_rcv_msg\n     ip_protocol_deliver_rcu            genl_family_rcv_msg_doit\n     tcp_v4_rcv                         mptcp_pm_nl_flush_addrs_doit\n     tcp_v4_do_rcv                      mptcp_nl_remove_addrs_list\n     tcp_rcv_established                mptcp_pm_remove_addrs_and_subflows\n     tcp_data_queue                     remove_anno_list_by_saddr\n     mptcp_incoming_options             mptcp_pm_del_add_timer\n     mptcp_pm_del_add_timer             kfree(entry)\n\nIn remove_anno_list_by_saddr(running on CPU2), after leaving the critical\nzone protected by \"pm.lock\", the entry will be released, which leads to the\noccurrence of uaf in the mptcp_pm_del_add_timer(running on CPU1).\n\nKeeping a reference to add_timer inside the lock, and calling\nsk_stop_timer_sync() with this reference, instead of \"entry-\u003eadd_timer\".\n\nMove list_del(&entry-\u003elist) to mptcp_pm_del_add_timer and inside the pm lock,\ndo not directly access any members of the entry outside the pm lock, which\ncan avoid similar \"entry-\u003ex\" uaf.","modified":"2026-04-02T12:19:47.251527Z","published":"2024-09-27T12:42:49.167Z","related":["ALSA-2024:10281","ALSA-2024:9605","SUSE-SU-2025:0499-1","SUSE-SU-2025:0556-1","SUSE-SU-2025:0557-1","SUSE-SU-2025:0564-1","SUSE-SU-2025:0577-1","SUSE-SU-2025:0577-2","SUSE-SU-2025:0847-1","SUSE-SU-2025:20190-1","SUSE-SU-2025:20192-1","SUSE-SU-2025:20260-1","SUSE-SU-2025:20270-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/46xxx/CVE-2024-46858.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/0e7814b028cd50b3ff79659d23dfa9da6a1e75e1"},{"type":"WEB","url":"https://git.kernel.org/stable/c/12134a652b0a10064844ea235173e70246eba6dc"},{"type":"WEB","url":"https://git.kernel.org/stable/c/3554482f4691571fc4b5490c17ae26896e62171c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6452b162549c7f9ef54655d3fb9977b9192e6e5b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/67409b358500c71632116356a0b065f112d7b707"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b4cd80b0338945a94972ac3ed54f8338d2da2076"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/46xxx/CVE-2024-46858.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2024-46858"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"00cfd77b9063dcdf3628a7087faba60de85a9cc8"},{"fixed":"0e7814b028cd50b3ff79659d23dfa9da6a1e75e1"},{"fixed":"3554482f4691571fc4b5490c17ae26896e62171c"},{"fixed":"67409b358500c71632116356a0b065f112d7b707"},{"fixed":"6452b162549c7f9ef54655d3fb9977b9192e6e5b"},{"fixed":"12134a652b0a10064844ea235173e70246eba6dc"},{"fixed":"b4cd80b0338945a94972ac3ed54f8338d2da2076"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-46858.json"}}],"schema_version":"1.7.5"}