{"cve":"CVE-2024-38589","nvd":{"published":"2024-06-19T14:15:19.000","modified":"2026-10-15T01:18:30.393","status":"Modified","description":"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---","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":5.5},"cwes":["CWE-667"],"references":["https://git.kernel.org/stable/c/1fbfb483c1a290dce3f41f52d45cc46dd88b7691","https://git.kernel.org/stable/c/3db2fc45d1d2a6457f06ebdfd45b9820e5b5c2b7","https://git.kernel.org/stable/c/421c50fa81836775bf0fd6ce0e57a6eb27af24d5","https://git.kernel.org/stable/c/5bc50a705cfac8f64ce51c95611c3dd0554ef9c3","https://git.kernel.org/stable/c/5fb7e2a4335fc67d6952ad2a6613c46e0b05f7c5"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T21:52:00.836172422+00:00"},"epss":{"cve":"CVE-2024-38589","score":0.00195,"percentile":0.09055,"date":"2026-10-25"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}