{"schema_version":"1.9.0","id":"CVE-2025-21812","published":"2025-02-27T20:01:02.837Z","modified":"2026-08-12T03:51:22.024295372Z","related":["SUSE-SU-2025:01614-1","SUSE-SU-2025:01620-1","SUSE-SU-2025:01627-1","SUSE-SU-2025:01640-1","SUSE-SU-2025:01707-1","SUSE-SU-2025:01919-1","SUSE-SU-2025:01951-1","SUSE-SU-2025:01964-1","SUSE-SU-2025:01967-1","SUSE-SU-2025:01982-1","SUSE-SU-2025:01995-1","SUSE-SU-2025:1573-1","SUSE-SU-2025:20343-1","SUSE-SU-2025:20344-1","SUSE-SU-2025:20354-1","SUSE-SU-2025:20355-1","USN-7521-2"],"summary":"ax25: rcu protect dev->ax25_ptr","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nax25: rcu protect dev->ax25_ptr\n\nsyzbot found a lockdep issue [1].\n\nWe should remove ax25 RTNL dependency in ax25_setsockopt()\n\nThis should also fix a variety of possible UAF in ax25.\n\n[1]\n\nWARNING: possible circular locking dependency detected\n6.13.0-rc3-syzkaller-00762-g9268abe611b0 #0 Not tainted\n------------------------------------------------------\nsyz.5.1818/12806 is trying to acquire lock:\n ffffffff8fcb3988 (rtnl_mutex){+.+.}-{4:4}, at: ax25_setsockopt+0xa55/0xe90 net/ax25/af_ax25.c:680\n\nbut task is already holding lock:\n ffff8880617ac258 (sk_lock-AF_AX25){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1618 [inline]\n ffff8880617ac258 (sk_lock-AF_AX25){+.+.}-{0:0}, at: ax25_setsockopt+0x209/0xe90 net/ax25/af_ax25.c:574\n\nwhich lock already depends on the new lock.\n\nthe existing dependency chain (in reverse order) is:\n\n-> #1 (sk_lock-AF_AX25){+.+.}-{0:0}:\n        lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849\n        lock_sock_nested+0x48/0x100 net/core/sock.c:3642\n        lock_sock include/net/sock.h:1618 [inline]\n        ax25_kill_by_device net/ax25/af_ax25.c:101 [inline]\n        ax25_device_event+0x24d/0x580 net/ax25/af_ax25.c:146\n        notifier_call_chain+0x1a5/0x3f0 kernel/notifier.c:85\n       __dev_notify_flags+0x207/0x400\n        dev_change_flags+0xf0/0x1a0 net/core/dev.c:9026\n        dev_ifsioc+0x7c8/0xe70 net/core/dev_ioctl.c:563\n        dev_ioctl+0x719/0x1340 net/core/dev_ioctl.c:820\n        sock_do_ioctl+0x240/0x460 net/socket.c:1234\n        sock_ioctl+0x626/0x8e0 net/socket.c:1339\n        vfs_ioctl fs/ioctl.c:51 [inline]\n        __do_sys_ioctl fs/ioctl.c:906 [inline]\n        __se_sys_ioctl+0xf5/0x170 fs/ioctl.c:892\n        do_syscall_x64 arch/x86/entry/common.c:52 [inline]\n        do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83\n       entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\n-> #0 (rtnl_mutex){+.+.}-{4:4}:\n        check_prev_add kernel/locking/lockdep.c:3161 [inline]\n        check_prevs_add kernel/locking/lockdep.c:3280 [inline]\n        validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3904\n        __lock_acquire+0x1397/0x2100 kernel/locking/lockdep.c:5226\n        lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849\n        __mutex_lock_common kernel/locking/mutex.c:585 [inline]\n        __mutex_lock+0x1ac/0xee0 kernel/locking/mutex.c:735\n        ax25_setsockopt+0xa55/0xe90 net/ax25/af_ax25.c:680\n        do_sock_setsockopt+0x3af/0x720 net/socket.c:2324\n        __sys_setsockopt net/socket.c:2349 [inline]\n        __do_sys_setsockopt net/socket.c:2355 [inline]\n        __se_sys_setsockopt net/socket.c:2352 [inline]\n        __x64_sys_setsockopt+0x1ee/0x280 net/socket.c:2352\n        do_syscall_x64 arch/x86/entry/common.c:52 [inline]\n        do_syscall_64+0xf3/0x230 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(sk_lock-AF_AX25);\n                               lock(rtnl_mutex);\n                               lock(sk_lock-AF_AX25);\n  lock(rtnl_mutex);\n\n *** DEADLOCK ***\n\n1 lock held by syz.5.1818/12806:\n  #0: ffff8880617ac258 (sk_lock-AF_AX25){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1618 [inline]\n  #0: ffff8880617ac258 (sk_lock-AF_AX25){+.+.}-{0:0}, at: ax25_setsockopt+0x209/0xe90 net/ax25/af_ax25.c:574\n\nstack backtrace:\nCPU: 1 UID: 0 PID: 12806 Comm: syz.5.1818 Not tainted 6.13.0-rc3-syzkaller-00762-g9268abe611b0 #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024\nCall Trace:\n <TASK>\n  __dump_stack lib/dump_stack.c:94 [inline]\n  dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120\n  print_circular_bug+0x13a/0x1b0 kernel/locking/lockdep.c:2074\n  check_noncircular+0x36a/0x4a0 kernel/locking/lockdep.c:2206\n  check_prev_add kernel/locking/lockdep.c:3161 [inline]\n  check_prevs_add kernel/lockin\n---truncated---","affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"c433570458e49bccea5c551df628d058b3526289"},{"fixed":"2802ed4ced27ebd474828fc67ffd7d66f11e3605"},{"fixed":"7705d8a7f2c26c80973c81093db07c6022b2b30e"},{"fixed":"8937f5e38a218531dce2a89fae60e3adcc2311e1"},{"fixed":"c2531db6de3c95551be58878f859c6a053b7eb2e"},{"fixed":"95fc45d1dea8e1253f8ec58abc5befb71553d666"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"0"},{"last_affected":"7f93d703e276311dd289c9a520ce9e8c8fa2858c"},{"last_affected":"c0e93a6d36135d5082cb3af8352f5b69c9f58d6e"},{"last_affected":"c39b8fd4997bf99503b8e48d8cb0eedb1d9a54f0"},{"last_affected":"26a5adc8eb26d170058645c3cccd4d19165bec16"},{"last_affected":"3e881d8764ed9b04ae3e5c3e5d132acb75ef91ba"},{"last_affected":"77768c96dcf860c43b970b87b2a09229f84ea560"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"3.18.132"},{"fixed":"3.19"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"4.4.170"},{"fixed":"4.5"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"4.9.149"},{"fixed":"4.10"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"4.14.92"},{"fixed":"4.15"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"4.19.14"},{"fixed":"4.20"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"4.20.1"},{"fixed":"4.21"}]}],"versions":["v4.20-rc1","v4.19","v4.20","v3.18.131","v4.4.169","v4.19.13","v4.14.91","v4.9.148","v4.20-rc7","v4.20-rc5","v4.9.147","v4.14.90","v4.19.12","v4.20-rc6","v4.19.11","v4.14.89","v4.9.146","v4.4.168","v3.18.130","v4.19.10","v4.20-rc4","v4.20-rc2","v4.4.167","v3.18.129","v4.9.145","v4.14.88","v4.19.9","v3.18.128","v4.4.166","v4.9.144","v4.14.87","v4.19.8","v4.20-rc3","v4.9.143","v4.14.86","v4.19.7","v4.9.142","v4.14.85","v4.19.6","v3.18.127","v4.4.165","v4.9.141","v4.14.84","v4.19.5","v4.19.4","v4.14.83","v4.9.140","v4.4.164","v3.18.126","v4.9.139","v4.9.138","v4.14.82","v4.19.3","v3.18.125","v4.4.163","v4.9.137","v4.14.81","v4.19.2","v4.9.136","v4.14.80","v4.19.1","v4.14.79","v4.9.135","v4.4.162","v3.18.124","v4.14.78","v4.19-rc2","v4.19-rc8","v4.19-rc4","v4.4.161","v4.9.134","v4.14.77","v4.19-rc1","v4.14.76","v4.9.133","v4.19-rc7","v4.14.75","v4.9.132","v4.4.160","v3.18.123","v4.14.74","v4.9.131","v4.4.159","v4.19-rc6","v4.19-rc5","v4.9.130","v4.14.73","v4.19-rc3","v4.4.158","v4.9.129","v4.14.72","v4.14.71","v4.9.128","v4.4.157","v3.18.122","v4.4.156","v4.9.127","v4.14.70","v4.14.69","v4.9.126","v4.4.155","v3.18.121","v4.4.154","v4.9.125","v4.14.68","v4.14.67","v4.9.124","v4.4.153","v3.18.120","v4.4.152","v3.18.119","v4.4.151","v4.9.123","v4.14.66","v4.18","v4.4.150","v4.9.122","v4.14.65","v4.14.64","v4.9.121","v4.4.149","v4.14.63","v4.9.120","v4.4.148","v3.18.118","v4.18-rc1","v4.9.119","v4.14.62","v4.4.147","v4.18-rc8","v4.18-rc2","v4.18-rc5","v3.18.117","v4.4.146","v4.9.118","v4.14.61","v4.18-rc6","v4.4.145","v4.9.117","v4.14.60","v4.18-rc7","v4.9.116","v4.14.59","v4.17","v4.14.58","v4.9.115","v4.4.144","v3.18.116","v4.18-rc3","v4.14.57","v4.9.114","v4.4.143","v4.14.56","v4.9.113","v4.4.142","v3.18.115","v4.18-rc4","v4.4.141","v4.14.55","v4.9.112","v4.4.140","v4.14.54","v4.9.111","v4.4.139","v3.18.114","v4.14.53","v4.14.52","v4.9.110","v4.4.138","v3.18.113","v4.9.109","v4.14.51","v4.14.50","v4.4.137","v4.9.108","v4.14.49","v4.9.107","v4.4.136","v3.18.112","v4.14.48","v4.17-rc1","v4.4.135","v4.9.106","v4.14.47","v4.9.105","v4.17-rc2","v4.17-rc7","v4.17-rc3","v4.17-rc4","v4.16","v4.14.46","v4.9.104","v4.4.134","v3.18.111","v4.14.45","v4.17-rc6","v4.14.44","v4.9.103","v4.4.133","v3.18.110","v4.17-rc5","v4.4.132","v4.14.43","v4.9.102","v3.18.109","v4.14.42","v4.9.101","v4.9.100","v4.14.41","v4.14.40","v4.9.99","v4.4.131","v3.18.108","v4.14.39","v4.9.98","v3.18.107","v4.4.130","v4.9.97","v4.14.38","v4.14.37","v4.9.96","v4.4.129","v3.18.106","v4.14.36","v4.14.35","v4.9.95","v4.4.128","v3.18.105","v4.9.94","v4.14.34","v3.18.104","v4.4.127","v4.9.93","v4.14.33","v4.16-rc7","v4.16-rc4","v3.18.103","v4.14.32","v4.9.92","v4.4.126","v3.18.102","v4.16-rc1","v4.16-rc2","v4.16-rc5","v4.4.125","v4.9.91","v4.14.31","v4.4.124","v4.9.90","v4.14.30","v4.16-rc3","v4.16-rc6","v4.14.29","v4.9.89","v4.4.123","v3.18.101","v3.18.100","v4.4.122","v4.9.88","v4.14.28","v4.14.27","v4.9.87","v4.4.121","v3.18.99","v4.14.26","v4.14.25","v4.9.86","v4.4.120","v3.18.98","v4.14.24","v4.14","v4.14.23","v4.9.85","v4.4.119","v3.18.97","v4.15","v4.14.22","v4.9.84","v4.4.118","v3.18.96","v4.14.21","v4.9.83","v4.4.117","v3.18.95","v4.4.116","v4.9.82","v4.14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