{"id":"CVE-2024-53047","summary":"mptcp: init: protect sched with rcu_read_lock","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nmptcp: init: protect sched with rcu_read_lock\n\nEnabling CONFIG_PROVE_RCU_LIST with its dependence CONFIG_RCU_EXPERT\ncreates this splat when an MPTCP socket is created:\n\n  =============================\n  WARNING: suspicious RCU usage\n  6.12.0-rc2+ #11 Not tainted\n  -----------------------------\n  net/mptcp/sched.c:44 RCU-list traversed in non-reader section!!\n\n  other info that might help us debug this:\n\n  rcu_scheduler_active = 2, debug_locks = 1\n  no locks held by mptcp_connect/176.\n\n  stack backtrace:\n  CPU: 0 UID: 0 PID: 176 Comm: mptcp_connect Not tainted 6.12.0-rc2+ #11\n  Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011\n  Call Trace:\n   \u003cTASK\u003e\n   dump_stack_lvl (lib/dump_stack.c:123)\n   lockdep_rcu_suspicious (kernel/locking/lockdep.c:6822)\n   mptcp_sched_find (net/mptcp/sched.c:44 (discriminator 7))\n   mptcp_init_sock (net/mptcp/protocol.c:2867 (discriminator 1))\n   ? sock_init_data_uid (arch/x86/include/asm/atomic.h:28)\n   inet_create.part.0.constprop.0 (net/ipv4/af_inet.c:386)\n   ? __sock_create (include/linux/rcupdate.h:347 (discriminator 1))\n   __sock_create (net/socket.c:1576)\n   __sys_socket (net/socket.c:1671)\n   ? __pfx___sys_socket (net/socket.c:1712)\n   ? do_user_addr_fault (arch/x86/mm/fault.c:1419 (discriminator 1))\n   __x64_sys_socket (net/socket.c:1728)\n   do_syscall_64 (arch/x86/entry/common.c:52 (discriminator 1))\n   entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)\n\nThat's because when the socket is initialised, rcu_read_lock() is not\nused despite the explicit comment written above the declaration of\nmptcp_sched_find() in sched.c. Adding the missing lock/unlock avoids the\nwarning.","modified":"2026-04-02T12:22:39.587378Z","published":"2024-11-19T17:19:34.036Z","related":["USN-7276-1","USN-7277-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/53xxx/CVE-2024-53047.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/3deb12c788c385e17142ce6ec50f769852fcec65"},{"type":"WEB","url":"https://git.kernel.org/stable/c/494eb22f9a7bd03783e60595a57611c209175f1a"},{"type":"WEB","url":"https://git.kernel.org/stable/c/cb8b81ad3e893a6d18dcdd3754cc2ea2a42c0136"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/53xxx/CVE-2024-53047.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2024-53047"},{"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":"1730b2b2c5a5a886007b247366aebe0976dc8881"},{"fixed":"cb8b81ad3e893a6d18dcdd3754cc2ea2a42c0136"},{"fixed":"494eb22f9a7bd03783e60595a57611c209175f1a"},{"fixed":"3deb12c788c385e17142ce6ec50f769852fcec65"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-53047.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}