CVE-2024-36286

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> netfilter: nfnetlink_queue: acquire rcu_read_lock() in instance_destroy_rcu()<br /> <br /> syzbot reported that nf_reinject() could be called without rcu_read_lock() :<br /> <br /> WARNING: suspicious RCU usage<br /> 6.9.0-rc7-syzkaller-02060-g5c1672705a1a #0 Not tainted<br /> <br /> net/netfilter/nfnetlink_queue.c:263 suspicious rcu_dereference_check() usage!<br /> <br /> other info that might help us debug this:<br /> <br /> rcu_scheduler_active = 2, debug_locks = 1<br /> 2 locks held by syz-executor.4/13427:<br /> #0: ffffffff8e334f60 (rcu_callback){....}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:329 [inline]<br /> #0: ffffffff8e334f60 (rcu_callback){....}-{0:0}, at: rcu_do_batch kernel/rcu/tree.c:2190 [inline]<br /> #0: ffffffff8e334f60 (rcu_callback){....}-{0:0}, at: rcu_core+0xa86/0x1830 kernel/rcu/tree.c:2471<br /> #1: ffff88801ca92958 (&amp;inst-&gt;lock){+.-.}-{2:2}, at: spin_lock_bh include/linux/spinlock.h:356 [inline]<br /> #1: ffff88801ca92958 (&amp;inst-&gt;lock){+.-.}-{2:2}, at: nfqnl_flush net/netfilter/nfnetlink_queue.c:405 [inline]<br /> #1: ffff88801ca92958 (&amp;inst-&gt;lock){+.-.}-{2:2}, at: instance_destroy_rcu+0x30/0x220 net/netfilter/nfnetlink_queue.c:172<br /> <br /> stack backtrace:<br /> CPU: 0 PID: 13427 Comm: syz-executor.4 Not tainted 6.9.0-rc7-syzkaller-02060-g5c1672705a1a #0<br /> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024<br /> Call Trace:<br /> <br /> __dump_stack lib/dump_stack.c:88 [inline]<br /> dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114<br /> lockdep_rcu_suspicious+0x221/0x340 kernel/locking/lockdep.c:6712<br /> nf_reinject net/netfilter/nfnetlink_queue.c:323 [inline]<br /> nfqnl_reinject+0x6ec/0x1120 net/netfilter/nfnetlink_queue.c:397<br /> nfqnl_flush net/netfilter/nfnetlink_queue.c:410 [inline]<br /> instance_destroy_rcu+0x1ae/0x220 net/netfilter/nfnetlink_queue.c:172<br /> rcu_do_batch kernel/rcu/tree.c:2196 [inline]<br /> rcu_core+0xafd/0x1830 kernel/rcu/tree.c:2471<br /> handle_softirqs+0x2d6/0x990 kernel/softirq.c:554<br /> __do_softirq kernel/softirq.c:588 [inline]<br /> invoke_softirq kernel/softirq.c:428 [inline]<br /> __irq_exit_rcu+0xf4/0x1c0 kernel/softirq.c:637<br /> irq_exit_rcu+0x9/0x30 kernel/softirq.c:649<br /> instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline]<br /> sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1043<br /> <br />