syzkaller syzkaller login: [ 25.443041][ T24] kauditd_printk_skb: 48 callbacks suppressed [ 25.443051][ T24] audit: type=1400 audit(1784571822.359:59): avc: denied { transition } for pid=259 comm="sshd-session" path="/bin/sh" dev="sda1" ino=90 scontext=system_u:system_r:sshd_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 [ 25.448478][ T24] audit: type=1400 audit(1784571822.359:60): avc: denied { noatsecure } for pid=259 comm="sshd-session" scontext=system_u:system_r:sshd_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 [ 25.452155][ T24] audit: type=1400 audit(1784571822.369:61): avc: denied { write } for pid=259 comm="sh" path="pipe:[14358]" dev="pipefs" ino=14358 scontext=root:sysadm_r:sysadm_t tcontext=system_u:system_r:sshd_t tclass=fifo_file permissive=1 [ 25.456134][ T24] audit: type=1400 audit(1784571822.369:62): avc: denied { rlimitinh } for pid=259 comm="sh" scontext=system_u:system_r:sshd_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 [ 25.459197][ T24] audit: type=1400 audit(1784571822.369:63): avc: denied { siginh } for pid=259 comm="sh" scontext=system_u:system_r:sshd_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 Warning: Permanently added '10.128.0.132' (ED25519) to the list of known hosts. 2026/07/20 18:23:51 parsed 1 programs 2026/07/20 18:23:51 serving rpc on tcp://33027 [ 34.602316][ T24] audit: type=1400 audit(1784571831.519:64): avc: denied { node_bind } for pid=287 comm="syz-execprog" saddr=::1 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:node_t tclass=tcp_socket permissive=1 [ 34.636569][ T24] audit: type=1400 audit(1784571831.519:65): avc: denied { create } for pid=287 comm="syz-execprog" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=rawip_socket permissive=1 [ 34.656312][ T24] audit: type=1400 audit(1784571831.519:66): avc: denied { module_request } for pid=287 comm="syz-execprog" kmod="net-pf-2-proto-262-type-1" scontext=root:sysadm_r:sysadm_t tcontext=system_u:system_r:kernel_t tclass=system permissive=1 [ 35.231625][ T24] audit: type=1400 audit(1784571832.149:67): avc: denied { mounton } for pid=293 comm="syz-executor" path="/syzcgroup/unified" dev="sda1" ino=2024 scontext=root:sysadm_r:sysadm_t tcontext=root:object_r:root_t tclass=dir permissive=1 [ 35.232631][ T293] cgroup: Unknown subsys name 'net' [ 35.254283][ T24] audit: type=1400 audit(1784571832.149:68): avc: denied { mount } for pid=293 comm="syz-executor" name="/" dev="cgroup2" ino=1 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:cgroup_t tclass=filesystem permissive=1 [ 35.281509][ T24] audit: type=1400 audit(1784571832.179:69): avc: denied { unmount } for pid=293 comm="syz-executor" scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:cgroup_t tclass=filesystem permissive=1 [ 35.281673][ T293] cgroup: Unknown subsys name 'devices' [ 35.394698][ T293] cgroup: Unknown subsys name 'hugetlb' [ 35.400307][ T293] cgroup: Unknown subsys name 'rlimit' [ 35.573184][ T24] audit: type=1400 audit(1784571832.489:70): avc: denied { setattr } for pid=293 comm="syz-executor" name="raw-gadget" dev="devtmpfs" ino=253 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:device_t tclass=chr_file permissive=1 [ 35.596331][ T24] audit: type=1400 audit(1784571832.499:71): avc: denied { create } for pid=293 comm="syz-executor" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=netlink_generic_socket permissive=1 [ 35.616890][ T24] audit: type=1400 audit(1784571832.499:72): avc: denied { write } for pid=293 comm="syz-executor" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=netlink_generic_socket permissive=1 [ 35.637142][ T24] audit: type=1400 audit(1784571832.499:73): avc: denied { read } for pid=293 comm="syz-executor" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=netlink_generic_socket permissive=1 [ 35.642506][ T297] SELinux: Context root:object_r:swapfile_t is not valid (left unmapped). Setting up swapspace version 1, size = 127995904 bytes [ 35.711179][ T293] Adding 124996k swap on ./swap-file. Priority:0 extents:1 across:124996k [ 36.099447][ T299] request_module fs-gadgetfs succeeded, but still no fs? [ 36.109529][ T299] cgroup: cgroup: disabling cgroup2 socket matching due to net_prio or net_cls activation [ 36.285874][ T318] bridge0: port 1(bridge_slave_0) entered blocking state [ 36.292944][ T318] bridge0: port 1(bridge_slave_0) entered disabled state [ 36.300459][ T318] device bridge_slave_0 entered promiscuous mode [ 36.308217][ T318] bridge0: port 2(bridge_slave_1) entered blocking state [ 36.315278][ T318] bridge0: port 2(bridge_slave_1) entered disabled state [ 36.322838][ T318] device bridge_slave_1 entered promiscuous mode [ 36.355009][ T318] bridge0: port 2(bridge_slave_1) entered blocking state [ 36.362158][ T318] bridge0: port 2(bridge_slave_1) entered forwarding state [ 36.370719][ T318] bridge0: port 1(bridge_slave_0) entered blocking state [ 36.377836][ T318] bridge0: port 1(bridge_slave_0) entered forwarding state [ 36.393046][ T112] bridge0: port 1(bridge_slave_0) entered disabled state [ 36.400286][ T112] bridge0: port 2(bridge_slave_1) entered disabled state [ 36.407808][ T112] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 36.416022][ T112] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 36.426182][ T112] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 36.434325][ T112] bridge0: port 1(bridge_slave_0) entered blocking state [ 36.441359][ T112] bridge0: port 1(bridge_slave_0) entered forwarding state [ 36.449892][ T112] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 36.458206][ T112] bridge0: port 2(bridge_slave_1) entered blocking state [ 36.465268][ T112] bridge0: port 2(bridge_slave_1) entered forwarding state [ 36.476917][ T112] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 36.485793][ T112] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 36.498320][ T112] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 36.509056][ T112] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 36.517105][ T112] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 36.524612][ T112] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 36.532456][ T318] device veth0_vlan entered promiscuous mode [ 36.542277][ T112] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 36.551106][ T318] device veth1_macvtap entered promiscuous mode [ 36.559633][ T112] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 36.569417][ T112] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready 2026/07/20 18:23:54 executed programs: 0 [ 37.110465][ T365] bridge0: port 1(bridge_slave_0) entered blocking state [ 37.117604][ T365] bridge0: port 1(bridge_slave_0) entered disabled state [ 37.125180][ T365] device bridge_slave_0 entered promiscuous mode [ 37.132064][ T365] bridge0: port 2(bridge_slave_1) entered blocking state [ 37.139107][ T365] bridge0: port 2(bridge_slave_1) entered disabled state [ 37.146385][ T365] device bridge_slave_1 entered promiscuous mode [ 37.183954][ T365] bridge0: port 2(bridge_slave_1) entered blocking state [ 37.190988][ T365] bridge0: port 2(bridge_slave_1) entered forwarding state [ 37.198263][ T365] bridge0: port 1(bridge_slave_0) entered blocking state [ 37.205301][ T365] bridge0: port 1(bridge_slave_0) entered forwarding state [ 37.224275][ T112] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 37.231766][ T112] bridge0: port 1(bridge_slave_0) entered disabled state [ 37.239154][ T112] bridge0: port 2(bridge_slave_1) entered disabled state [ 37.248346][ T112] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 37.256685][ T112] bridge0: port 1(bridge_slave_0) entered blocking state [ 37.263737][ T112] bridge0: port 1(bridge_slave_0) entered forwarding state [ 37.276251][ T112] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 37.284384][ T112] bridge0: port 2(bridge_slave_1) entered blocking state [ 37.291384][ T112] bridge0: port 2(bridge_slave_1) entered forwarding state [ 37.305352][ T112] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_hsr: link becomes ready [ 37.313379][ T112] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 37.322043][ T112] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_hsr: link becomes ready [ 37.330325][ T112] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 37.339853][ T9] device bridge_slave_1 left promiscuous mode [ 37.345997][ T9] bridge0: port 2(bridge_slave_1) entered disabled state [ 37.353515][ T9] device bridge_slave_0 left promiscuous mode [ 37.359658][ T9] bridge0: port 1(bridge_slave_0) entered disabled state [ 37.367547][ T9] device veth1_macvtap left promiscuous mode [ 37.373571][ T9] device veth0_vlan left promiscuous mode [ 37.420876][ T112] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_virt_wifi: link becomes ready [ 37.429190][ T112] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 37.439696][ T112] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_vlan: link becomes ready [ 37.447762][ T112] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 37.456060][ T112] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 37.464552][ T112] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 37.472352][ T365] device veth0_vlan entered promiscuous mode [ 37.481630][ T112] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_macvtap: link becomes ready [ 37.490070][ T112] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 37.499214][ T365] device veth1_macvtap entered promiscuous mode [ 37.507674][ T112] IPv6: ADDRCONF(NETDEV_CHANGE): macsec0: link becomes ready [ 37.515512][ T112] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_0: link becomes ready [ 37.523655][ T112] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 37.532637][ T112] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready [ 37.540885][ T112] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready [ 37.562273][ T369] ================================================================== [ 37.570361][ T369] BUG: KASAN: use-after-free in mutex_lock+0x85/0xf0 [ 37.577013][ T369] Write of size 8 at addr ffff8881117fd550 by task syz.2.17/369 [ 37.584636][ T369] [ 37.586951][ T369] CPU: 1 PID: 369 Comm: syz.2.17 Not tainted syzkaller #0 [ 37.594034][ T369] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/25/2026 [ 37.604066][ T369] Call Trace: [ 37.607444][ T369] __dump_stack+0x21/0x24 [ 37.611754][ T369] dump_stack_lvl+0x1a7/0x208 [ 37.616410][ T369] ? show_regs_print_info+0x18/0x18 [ 37.621584][ T369] ? thaw_kernel_threads+0x220/0x220 [ 37.626843][ T369] ? debug_smp_processor_id+0x17/0x20 [ 37.632187][ T369] print_address_description+0x7f/0x2c0 [ 37.637705][ T369] ? mutex_lock+0x85/0xf0 [ 37.642007][ T369] kasan_report+0x100/0x140 [ 37.646489][ T369] ? mutex_lock+0x85/0xf0 [ 37.650792][ T369] kasan_check_range+0x249/0x2a0 [ 37.655704][ T369] __kasan_check_write+0x14/0x20 [ 37.660614][ T369] mutex_lock+0x85/0xf0 [ 37.664743][ T369] ? mutex_trylock+0xb0/0xb0 [ 37.669307][ T369] ? l2tp_session_put+0xb2/0x1a0 [ 37.674221][ T369] ? l2tp_session_delete+0x3a9/0x4a0 [ 37.679739][ T369] pppol2tp_release+0x178/0x2b0 [ 37.684567][ T369] sock_close+0xb8/0x200 [ 37.688778][ T369] ? sock_mmap+0xa0/0xa0 [ 37.692996][ T369] __fput+0x2dc/0x730 [ 37.696960][ T369] ____fput+0x15/0x20 [ 37.700917][ T369] task_work_run+0x127/0x190 [ 37.705483][ T369] exit_to_user_mode_loop+0xcb/0xe0 [ 37.710659][ T369] exit_to_user_mode_prepare+0x76/0xa0 [ 37.716122][ T369] syscall_exit_to_user_mode+0x1d/0x40 [ 37.721564][ T369] do_syscall_64+0x3d/0x40 [ 37.725959][ T369] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 37.731825][ T369] RIP: 0033:0x7f579d3a3e99 [ 37.736217][ T369] Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 [ 37.755802][ T369] RSP: 002b:00007ffcc9079048 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4 [ 37.764192][ T369] RAX: 0000000000000000 RBX: 00007ffcc9079130 RCX: 00007f579d3a3e99 [ 37.772143][ T369] RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003 [ 37.780092][ T369] RBP: 00000000000092a0 R08: 0000000000000001 R09: 0000000000000000 [ 37.788046][ T369] R10: 0000001b32c20000 R11: 0000000000000246 R12: 0000000000000000 [ 37.795999][ T369] R13: 00007f579d62bfac R14: 00007f579d62bfa8 R15: 00007f579d62bfa0 [ 37.803953][ T369] [ 37.806257][ T369] Allocated by task 369: [ 37.810478][ T369] __kasan_kmalloc+0xd4/0x100 [ 37.815151][ T369] __kmalloc+0x19f/0x330 [ 37.819368][ T369] l2tp_session_create+0x39/0xb60 [ 37.824364][ T369] pppol2tp_connect+0xbf5/0x1640 [ 37.829271][ T369] __sys_connect+0x3ce/0x450 [ 37.833837][ T369] __x64_sys_connect+0x7a/0x90 [ 37.838575][ T369] do_syscall_64+0x31/0x40 [ 37.842963][ T369] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 37.848832][ T369] [ 37.851137][ T369] Freed by task 369: [ 37.855017][ T369] kasan_set_track+0x4a/0x70 [ 37.859597][ T369] kasan_set_free_info+0x23/0x40 [ 37.864510][ T369] ____kasan_slab_free+0x125/0x160 [ 37.869618][ T369] __kasan_slab_free+0x11/0x20 [ 37.874359][ T369] slab_free_freelist_hook+0xc5/0x190 [ 37.879823][ T369] kfree+0xc0/0x270 [ 37.883611][ T369] l2tp_session_put+0xb2/0x1a0 [ 37.888356][ T369] l2tp_session_delete+0x3a9/0x4a0 [ 37.893440][ T369] pppol2tp_release+0x169/0x2b0 [ 37.898265][ T369] sock_close+0xb8/0x200 [ 37.902489][ T369] __fput+0x2dc/0x730 [ 37.906458][ T369] ____fput+0x15/0x20 [ 37.910454][ T369] task_work_run+0x127/0x190 [ 37.915091][ T369] exit_to_user_mode_loop+0xcb/0xe0 [ 37.920304][ T369] exit_to_user_mode_prepare+0x76/0xa0 [ 37.925765][ T369] syscall_exit_to_user_mode+0x1d/0x40 [ 37.931201][ T369] do_syscall_64+0x3d/0x40 [ 37.935596][ T369] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 37.941458][ T369] [ 37.943765][ T369] The buggy address belongs to the object at ffff8881117fd400 [ 37.943765][ T369] which belongs to the cache kmalloc-512 of size 512 [ 37.957816][ T369] The buggy address is located 336 bytes inside of [ 37.957816][ T369] 512-byte region [ffff8881117fd400, ffff8881117fd600) [ 37.971456][ T369] The buggy address belongs to the page: [ 37.977108][ T369] page:ffffea000445ff00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1117fc [ 37.987319][ T369] head:ffffea000445ff00 order:2 compound_mapcount:0 compound_pincount:0 [ 37.995626][ T369] flags: 0x4000000000010200(slab|head) [ 38.001069][ T369] raw: 4000000000010200 dead000000000100 dead000000000122 ffff888100043080 [ 38.009661][ T369] raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000 [ 38.018281][ T369] page dumped because: kasan: bad access detected [ 38.024672][ T369] page_owner tracks the page as allocated [ 38.030387][ T369] page last allocated via order 2, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 369, ts 37562112927, free_ts 37560698478 [ 38.050767][ T369] prep_new_page+0x176/0x190 [ 38.055335][ T369] get_page_from_freelist+0x225f/0x23f0 [ 38.060923][ T369] __alloc_pages_nodemask+0x29a/0x640 [ 38.066274][ T369] new_slab+0x84/0x3f0 [ 38.070315][ T369] ___slab_alloc+0x2f8/0x4c0 [ 38.074874][ T369] __slab_alloc+0x63/0xa0 [ 38.079182][ T369] __kmalloc+0x1f9/0x330 [ 38.083405][ T369] l2tp_session_create+0x39/0xb60 [ 38.088408][ T369] pppol2tp_connect+0xbf5/0x1640 [ 38.093336][ T369] __sys_connect+0x3ce/0x450 [ 38.097903][ T369] __x64_sys_connect+0x7a/0x90 [ 38.102639][ T369] do_syscall_64+0x31/0x40 [ 38.107041][ T369] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 38.112904][ T369] page last free stack trace: [ 38.117577][ T369] __free_pages_ok+0x80b/0x830 [ 38.122335][ T369] __free_pages+0xd8/0x390 [ 38.126737][ T369] __free_slab+0xcf/0x190 [ 38.131068][ T369] unfreeze_partials+0x150/0x180 [ 38.135980][ T369] put_cpu_partial+0xc1/0x180 [ 38.140631][ T369] __slab_free+0x2c9/0x3a0 [ 38.145034][ T369] ___cache_free+0x10e/0x130 [ 38.149596][ T369] qlink_free+0x50/0x90 [ 38.153724][ T369] qlist_free_all+0x5f/0xb0 [ 38.158216][ T369] kasan_quarantine_reduce+0x14a/0x160 [ 38.163672][ T369] __kasan_slab_alloc+0x2f/0xe0 [ 38.168500][ T369] slab_post_alloc_hook+0x5d/0x2f0 [ 38.173587][ T369] kmem_cache_alloc+0x15a/0x2d0 [ 38.178433][ T369] getname_flags+0xba/0x510 [ 38.182913][ T369] user_path_at_empty+0x2f/0x50 [ 38.187747][ T369] do_utimes+0x12e/0x2a0 [ 38.191971][ T369] [ 38.194280][ T369] Memory state around the buggy address: [ 38.199891][ T369] ffff8881117fd400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 38.207931][ T369] ffff8881117fd480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 38.216167][ T369] >ffff8881117fd500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 38.224205][ T369] ^ [ 38.230865][ T369] ffff8881117fd580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 38.239044][ T369] ffff8881117fd600: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 38.247081][ T369] ================================================================== [ 38.255222][ T369] Disabling lock debugging due to kernel taint