{ "schema_version": "1.6.1", "id": "RPI-CVE-2024-38589", "modified": "2026-10-07T17:22:01Z", "upstream": [ "CVE-2024-38589" ], "published": "2024-06-19T13:46:33Z", "summary": "netrom: fix possible dead-lock in nr_rt_ioctl()", "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetrom: fix possible dead-lock in nr_rt_ioctl()\n\nsyzbot loves netrom, and found a possible deadlock in nr_rt_ioctl [1]\n\nMake sure we always acquire nr_node_list_lock before nr_node_lock(nr_node)\n\n[1]\nWARNING: possible circular locking dependency detected\n6.9.0-rc7-syzkaller-02147-g654de42f3fc6 #0 Not tainted\n------------------------------------------------------\nsyz-executor350/5129 is trying to acquire lock:\n ffff8880186e2070 (&nr_node->node_lock){+...}-{2:2}, at: spin_lock_bh include/linux/spinlock.h:356 [inline]\n ffff8880186e2070 (&nr_node->node_lock){+...}-{2:2}, at: nr_node_lock include/net/netrom.h:152 [inline]\n ffff8880186e2070 (&nr_node->node_lock){+...}-{2:2}, at: nr_dec_obs net/netrom/nr_route.c:464 [inline]\n ffff8880186e2070 (&nr_node->node_lock){+...}-{2:2}, at: nr_rt_ioctl+0x1bb/0x1090 net/netrom/nr_route.c:697\n\nbut task is already holding lock:\n ffffffff8f7053b8 (nr_node_list_lock){+...}-{2:2}, at: spin_lock_bh include/linux/spinlock.h:356 [inline]\n ffffffff8f7053b8 (nr_node_list_lock){+...}-{2:2}, at: nr_dec_obs net/netrom/nr_route.c:462 [inline]\n ffffffff8f7053b8 (nr_node_list_lock){+...}-{2:2}, at: nr_rt_ioctl+0x10a/0x1090 net/netrom/nr_route.c:697\n\nwhich lock already depends on the new lock.\n\nthe existing dependency chain (in reverse order) is:\n\n-> #1 (nr_node_list_lock){+...}-{2:2}:\n lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5754\n __raw_spin_lock_bh include/linux/spinlock_api_smp.h:126 [inline]\n _raw_spin_lock_bh+0x35/0x50 kernel/locking/spinlock.c:178\n spin_lock_bh include/linux/spinlock.h:356 [inline]\n nr_remove_node net/netrom/nr_route.c:299 [inline]\n nr_del_node+0x4b4/0x820 net/netrom/nr_route.c:355\n nr_rt_ioctl+0xa95/0x1090 net/netrom/nr_route.c:683\n sock_do_ioctl+0x158/0x460 net/socket.c:1222\n sock_ioctl+0x629/0x8e0 net/socket.c:1341\n vfs_ioctl fs/ioctl.c:51 [inline]\n __do_sys_ioctl fs/ioctl.c:904 [inline]\n __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:890\n do_syscall_x64 arch/x86/entry/common.c:52 [inline]\n do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\n-> #0 (&nr_node->node_lock){+...}-{2:2}:\n check_prev_add kernel/locking/lockdep.c:3134 [inline]\n check_prevs_add kernel/locking/lockdep.c:3253 [inline]\n validate_chain+0x18cb/0x58e0 kernel/locking/lockdep.c:3869\n __lock_acquire+0x1346/0x1fd0 kernel/locking/lockdep.c:5137\n lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5754\n __raw_spin_lock_bh include/linux/spinlock_api_smp.h:126 [inline]\n _raw_spin_lock_bh+0x35/0x50 kernel/locking/spinlock.c:178\n spin_lock_bh include/linux/spinlock.h:356 [inline]\n nr_node_lock include/net/netrom.h:152 [inline]\n nr_dec_obs net/netrom/nr_route.c:464 [inline]\n nr_rt_ioctl+0x1bb/0x1090 net/netrom/nr_route.c:697\n sock_do_ioctl+0x158/0x460 net/socket.c:1222\n sock_ioctl+0x629/0x8e0 net/socket.c:1341\n vfs_ioctl fs/ioctl.c:51 [inline]\n __do_sys_ioctl fs/ioctl.c:904 [inline]\n __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:890\n do_syscall_x64 arch/x86/entry/common.c:52 [inline]\n do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nother info that might help us debug this:\n\n Possible unsafe locking scenario:\n\n CPU0 CPU1\n ---- ----\n lock(nr_node_list_lock);\n lock(&nr_node->node_lock);\n lock(nr_node_list_lock);\n lock(&nr_node->node_lock);\n\n *** DEADLOCK ***\n\n1 lock held by syz-executor350/5129:\n #0: ffffffff8f7053b8 (nr_node_list_lock){+...}-{2:2}, at: spin_lock_bh include/linux/spinlock.h:356 [inline]\n #0: ffffffff8f7053b8 (nr_node_list_lock){+...}-{2:2}, at: nr_dec_obs net/netrom/nr_route.c:462 [inline]\n #0: ffffffff8f70\n---truncated---", "affected": [ { 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