CVE-2025-40280

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> tipc: Fix use-after-free in tipc_mon_reinit_self().<br /> <br /> syzbot reported use-after-free of tipc_net(net)-&gt;monitors[]<br /> in tipc_mon_reinit_self(). [0]<br /> <br /> The array is protected by RTNL, but tipc_mon_reinit_self()<br /> iterates over it without RTNL.<br /> <br /> tipc_mon_reinit_self() is called from tipc_net_finalize(),<br /> which is always under RTNL except for tipc_net_finalize_work().<br /> <br /> Let&amp;#39;s hold RTNL in tipc_net_finalize_work().<br /> <br /> [0]:<br /> BUG: KASAN: slab-use-after-free in __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]<br /> BUG: KASAN: slab-use-after-free in _raw_spin_lock_irqsave+0xa7/0xf0 kernel/locking/spinlock.c:162<br /> Read of size 1 at addr ffff88805eae1030 by task kworker/0:7/5989<br /> <br /> CPU: 0 UID: 0 PID: 5989 Comm: kworker/0:7 Not tainted syzkaller #0 PREEMPT_{RT,(full)}<br /> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025<br /> Workqueue: events tipc_net_finalize_work<br /> Call Trace:<br /> <br /> dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120<br /> print_address_description mm/kasan/report.c:378 [inline]<br /> print_report+0xca/0x240 mm/kasan/report.c:482<br /> kasan_report+0x118/0x150 mm/kasan/report.c:595<br /> __kasan_check_byte+0x2a/0x40 mm/kasan/common.c:568<br /> kasan_check_byte include/linux/kasan.h:399 [inline]<br /> lock_acquire+0x8d/0x360 kernel/locking/lockdep.c:5842<br /> __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]<br /> _raw_spin_lock_irqsave+0xa7/0xf0 kernel/locking/spinlock.c:162<br /> rtlock_slowlock kernel/locking/rtmutex.c:1894 [inline]<br /> rwbase_rtmutex_lock_state kernel/locking/spinlock_rt.c:160 [inline]<br /> rwbase_write_lock+0xd3/0x7e0 kernel/locking/rwbase_rt.c:244<br /> rt_write_lock+0x76/0x110 kernel/locking/spinlock_rt.c:243<br /> write_lock_bh include/linux/rwlock_rt.h:99 [inline]<br /> tipc_mon_reinit_self+0x79/0x430 net/tipc/monitor.c:718<br /> tipc_net_finalize+0x115/0x190 net/tipc/net.c:140<br /> process_one_work kernel/workqueue.c:3236 [inline]<br /> process_scheduled_works+0xade/0x17b0 kernel/workqueue.c:3319<br /> worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400<br /> kthread+0x70e/0x8a0 kernel/kthread.c:463<br /> ret_from_fork+0x439/0x7d0 arch/x86/kernel/process.c:148<br /> ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245<br /> <br /> <br /> Allocated by task 6089:<br /> kasan_save_stack mm/kasan/common.c:47 [inline]<br /> kasan_save_track+0x3e/0x80 mm/kasan/common.c:68<br /> poison_kmalloc_redzone mm/kasan/common.c:388 [inline]<br /> __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:405<br /> kasan_kmalloc include/linux/kasan.h:260 [inline]<br /> __kmalloc_cache_noprof+0x1a8/0x320 mm/slub.c:4407<br /> kmalloc_noprof include/linux/slab.h:905 [inline]<br /> kzalloc_noprof include/linux/slab.h:1039 [inline]<br /> tipc_mon_create+0xc3/0x4d0 net/tipc/monitor.c:657<br /> tipc_enable_bearer net/tipc/bearer.c:357 [inline]<br /> __tipc_nl_bearer_enable+0xe16/0x13f0 net/tipc/bearer.c:1047<br /> __tipc_nl_compat_doit net/tipc/netlink_compat.c:371 [inline]<br /> tipc_nl_compat_doit+0x3bc/0x5f0 net/tipc/netlink_compat.c:393<br /> tipc_nl_compat_handle net/tipc/netlink_compat.c:-1 [inline]<br /> tipc_nl_compat_recv+0x83c/0xbe0 net/tipc/netlink_compat.c:1321<br /> genl_family_rcv_msg_doit+0x215/0x300 net/netlink/genetlink.c:1115<br /> genl_family_rcv_msg net/netlink/genetlink.c:1195 [inline]<br /> genl_rcv_msg+0x60e/0x790 net/netlink/genetlink.c:1210<br /> netlink_rcv_skb+0x208/0x470 net/netlink/af_netlink.c:2552<br /> genl_rcv+0x28/0x40 net/netlink/genetlink.c:1219<br /> netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline]<br /> netlink_unicast+0x846/0xa10 net/netlink/af_netlink.c:1346<br /> netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1896<br /> sock_sendmsg_nosec net/socket.c:714 [inline]<br /> __sock_sendmsg+0x21c/0x270 net/socket.c:729<br /> ____sys_sendmsg+0x508/0x820 net/socket.c:2614<br /> ___sys_sendmsg+0x21f/0x2a0 net/socket.c:2668<br /> __sys_sendmsg net/socket.c:2700 [inline]<br /> __do_sys_sendmsg net/socket.c:2705 [inline]<br /> __se_sys_sendmsg net/socket.c:2703 [inline]<br /> __x64_sys_sendmsg+0x1a1/0x260 net/socket.c:2703<br /> do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]<br /> do_syscall_64+0xfa/0x3b0 arch/<br /> ---truncated---