syzkaller syzkaller login: [ 11.297167][ T30] kauditd_printk_skb: 48 callbacks suppressed [ 11.297180][ T30] audit: type=1400 audit(1782142754.039:59): avc: denied { transition } for pid=221 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 [ 11.302761][ T30] audit: type=1400 audit(1782142754.039:60): avc: denied { noatsecure } for pid=221 comm="sshd-session" scontext=system_u:system_r:sshd_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 [ 11.306761][ T30] audit: type=1400 audit(1782142754.039:61): avc: denied { write } for pid=221 comm="sh" path="pipe:[14755]" dev="pipefs" ino=14755 scontext=root:sysadm_r:sysadm_t tcontext=system_u:system_r:sshd_t tclass=fifo_file permissive=1 [ 11.311493][ T30] audit: type=1400 audit(1782142754.039:62): avc: denied { rlimitinh } for pid=221 comm="sh" scontext=system_u:system_r:sshd_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 [ 11.316405][ T30] audit: type=1400 audit(1782142754.039:63): avc: denied { siginh } for pid=221 comm="sh" scontext=system_u:system_r:sshd_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 Warning: Permanently added '10.128.0.228' (ED25519) to the list of known hosts. 2026/06/22 15:39:23 parsed 1 programs 2026/06/22 15:39:23 serving rpc on tcp://37999 [ 20.878036][ T30] audit: type=1400 audit(1782142763.619:64): avc: denied { node_bind } for pid=293 comm="syz-execprog" saddr=::1 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:node_t tclass=tcp_socket permissive=1 [ 20.881650][ T30] audit: type=1400 audit(1782142763.619:65): avc: denied { module_request } for pid=293 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 [ 21.516422][ T30] audit: type=1400 audit(1782142764.259:66): avc: denied { mounton } for pid=302 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 [ 21.517522][ T302] cgroup: Unknown subsys name 'net' [ 21.539101][ T30] audit: type=1400 audit(1782142764.259:67): avc: denied { mount } for pid=302 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 [ 21.566380][ T30] audit: type=1400 audit(1782142764.279:68): avc: denied { unmount } for pid=302 comm="syz-executor" scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:cgroup_t tclass=filesystem permissive=1 [ 21.566537][ T302] cgroup: Unknown subsys name 'devices' [ 21.677197][ T302] cgroup: Unknown subsys name 'hugetlb' [ 21.683088][ T302] cgroup: Unknown subsys name 'rlimit' [ 21.794560][ T30] audit: type=1400 audit(1782142764.529:69): avc: denied { setattr } for pid=302 comm="syz-executor" name="raw-gadget" dev="devtmpfs" ino=254 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:device_t tclass=chr_file permissive=1 [ 21.817810][ T30] audit: type=1400 audit(1782142764.529:70): avc: denied { create } for pid=302 comm="syz-executor" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=netlink_generic_socket permissive=1 [ 21.838157][ T30] audit: type=1400 audit(1782142764.529:71): avc: denied { write } for pid=302 comm="syz-executor" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=netlink_generic_socket permissive=1 [ 21.843930][ T304] SELinux: Context root:object_r:swapfile_t is not valid (left unmapped). [ 21.858416][ T30] audit: type=1400 audit(1782142764.559:72): avc: denied { read } for pid=302 comm="syz-executor" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=netlink_generic_socket permissive=1 Setting up swapspace version 1, size = 127995904 bytes [ 21.887259][ T30] audit: type=1400 audit(1782142764.559:73): avc: denied { mounton } for pid=302 comm="syz-executor" path="/proc/sys/fs/binfmt_misc" dev="binfmt_misc" ino=1 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:binfmt_misc_fs_t tclass=dir permissive=1 [ 21.917877][ T302] Adding 124996k swap on ./swap-file. Priority:0 extents:1 across:124996k [ 22.334630][ T308] request_module fs-gadgetfs succeeded, but still no fs? [ 22.637162][ T331] bridge0: port 1(bridge_slave_0) entered blocking state [ 22.644217][ T331] bridge0: port 1(bridge_slave_0) entered disabled state [ 22.651736][ T331] device bridge_slave_0 entered promiscuous mode [ 22.658766][ T331] bridge0: port 2(bridge_slave_1) entered blocking state [ 22.665988][ T331] bridge0: port 2(bridge_slave_1) entered disabled state [ 22.673281][ T331] device bridge_slave_1 entered promiscuous mode [ 22.709327][ T331] bridge0: port 2(bridge_slave_1) entered blocking state [ 22.716379][ T331] bridge0: port 2(bridge_slave_1) entered forwarding state [ 22.723638][ T331] bridge0: port 1(bridge_slave_0) entered blocking state [ 22.730680][ T331] bridge0: port 1(bridge_slave_0) entered forwarding state [ 22.748947][ T10] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 22.756898][ T10] bridge0: port 1(bridge_slave_0) entered disabled state [ 22.764065][ T10] bridge0: port 2(bridge_slave_1) entered disabled state [ 22.773032][ T10] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 22.781248][ T10] bridge0: port 1(bridge_slave_0) entered blocking state [ 22.788291][ T10] bridge0: port 1(bridge_slave_0) entered forwarding state [ 22.797513][ T10] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 22.805784][ T10] bridge0: port 2(bridge_slave_1) entered blocking state [ 22.812828][ T10] bridge0: port 2(bridge_slave_1) entered forwarding state [ 22.824191][ T10] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 22.833876][ T10] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 22.848168][ T10] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 22.858766][ T10] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 22.866856][ T10] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 22.874230][ T10] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 22.883251][ T331] device veth0_vlan entered promiscuous mode [ 22.894006][ T10] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 22.903494][ T331] device veth1_macvtap entered promiscuous mode [ 22.912467][ T10] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 22.922216][ T10] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready [ 22.962002][ T331] syz-executor (331) used greatest stack depth: 21864 bytes left 2026/06/22 15:39:26 executed programs: 0 [ 23.415805][ T369] bridge0: port 1(bridge_slave_0) entered blocking state [ 23.422840][ T369] bridge0: port 1(bridge_slave_0) entered disabled state [ 23.430625][ T369] device bridge_slave_0 entered promiscuous mode [ 23.437606][ T369] bridge0: port 2(bridge_slave_1) entered blocking state [ 23.444651][ T369] bridge0: port 2(bridge_slave_1) entered disabled state [ 23.452050][ T369] device bridge_slave_1 entered promiscuous mode [ 23.489667][ T369] bridge0: port 2(bridge_slave_1) entered blocking state [ 23.496722][ T369] bridge0: port 2(bridge_slave_1) entered forwarding state [ 23.503960][ T369] bridge0: port 1(bridge_slave_0) entered blocking state [ 23.511008][ T369] bridge0: port 1(bridge_slave_0) entered forwarding state [ 23.529455][ T10] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 23.536978][ T10] bridge0: port 1(bridge_slave_0) entered disabled state [ 23.544153][ T10] bridge0: port 2(bridge_slave_1) entered disabled state [ 23.554224][ T10] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 23.562890][ T10] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 23.571461][ T10] bridge0: port 1(bridge_slave_0) entered blocking state [ 23.578520][ T10] bridge0: port 1(bridge_slave_0) entered forwarding state [ 23.586773][ T10] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 23.595120][ T10] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 23.603525][ T10] bridge0: port 2(bridge_slave_1) entered blocking state [ 23.610660][ T10] bridge0: port 2(bridge_slave_1) entered forwarding state [ 23.622788][ T10] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_hsr: link becomes ready [ 23.631125][ T10] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 23.641459][ T10] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_hsr: link becomes ready [ 23.649662][ T10] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 23.661034][ T10] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_virt_wifi: link becomes ready [ 23.670204][ T10] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 23.681162][ T10] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_vlan: link becomes ready [ 23.689134][ T10] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 23.697157][ T10] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 23.704614][ T10] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 23.714663][ T369] device veth0_vlan entered promiscuous mode [ 23.725258][ T10] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_macvtap: link becomes ready [ 23.733508][ T10] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 23.742579][ T369] device veth1_macvtap entered promiscuous mode [ 23.751221][ T10] IPv6: ADDRCONF(NETDEV_CHANGE): macsec0: link becomes ready [ 23.758965][ T10] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_0: link becomes ready [ 23.767220][ T10] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 23.776590][ T10] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready [ 23.784846][ T10] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready [ 23.806860][ T373] ================================================================== [ 23.814952][ T373] BUG: KASAN: use-after-free in mutex_lock+0x8e/0x1c0 [ 23.821927][ T373] Write of size 8 at addr ffff8881102f7950 by task syz.2.17/373 [ 23.829643][ T373] [ 23.832053][ T373] CPU: 1 PID: 373 Comm: syz.2.17 Not tainted syzkaller #0 [ 23.839140][ T373] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 [ 23.849186][ T373] Call Trace: [ 23.852458][ T373] [ 23.855387][ T373] __dump_stack+0x21/0x30 [ 23.859703][ T373] dump_stack_lvl+0x110/0x170 [ 23.864368][ T373] ? show_regs_print_info+0x20/0x20 [ 23.869555][ T373] ? load_image+0x3f0/0x3f0 [ 23.874070][ T373] print_address_description+0x7f/0x2c0 [ 23.879603][ T373] ? mutex_lock+0x8e/0x1c0 [ 23.884006][ T373] kasan_report+0x10f/0x150 [ 23.888511][ T373] ? mutex_lock+0x8e/0x1c0 [ 23.892918][ T373] kasan_check_range+0x249/0x2a0 [ 23.897847][ T373] __kasan_check_write+0x14/0x20 [ 23.902958][ T373] mutex_lock+0x8e/0x1c0 [ 23.907190][ T373] ? wait_for_completion_killable_timeout+0x10/0x10 [ 23.913771][ T373] ? l2tp_session_put+0xaf/0x1a0 [ 23.918947][ T373] ? l2tp_session_delete+0x3a9/0x4a0 [ 23.924239][ T373] pppol2tp_release+0x178/0x2b0 [ 23.929142][ T373] sock_close+0xb8/0x200 [ 23.933379][ T373] ? sock_mmap+0xa0/0xa0 [ 23.937611][ T373] __fput+0x22b/0x900 [ 23.941584][ T373] ____fput+0x15/0x20 [ 23.945551][ T373] task_work_run+0x127/0x190 [ 23.950127][ T373] exit_to_user_mode_loop+0xd0/0xe0 [ 23.955315][ T373] exit_to_user_mode_prepare+0x87/0xd0 [ 23.960766][ T373] syscall_exit_to_user_mode+0x1a/0x30 [ 23.966214][ T373] do_syscall_64+0x58/0xa0 [ 23.970624][ T373] ? clear_bhb_loop+0x50/0xa0 [ 23.975286][ T373] ? clear_bhb_loop+0x50/0xa0 [ 23.979955][ T373] entry_SYSCALL_64_after_hwframe+0x66/0xd0 [ 23.985931][ T373] RIP: 0033:0x7fe85600ee59 [ 23.990351][ T373] 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 [ 24.009948][ T373] RSP: 002b:00007ffc23bf57d8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4 [ 24.018359][ T373] RAX: 0000000000000000 RBX: 00007ffc23bf58c0 RCX: 00007fe85600ee59 [ 24.026406][ T373] RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003 [ 24.034374][ T373] RBP: 0000000000005ced R08: 0000000000000001 R09: 0000000000000000 [ 24.042338][ T373] R10: 0000001b33020000 R11: 0000000000000246 R12: 0000000000000000 [ 24.050311][ T373] R13: 00007fe856287fac R14: 00007fe856287fa8 R15: 00007fe856287fa0 [ 24.058287][ T373] [ 24.061297][ T373] [ 24.063611][ T373] Allocated by task 373: [ 24.067833][ T373] __kasan_kmalloc+0xd4/0x100 [ 24.072506][ T373] __kmalloc+0x13d/0x2c0 [ 24.076743][ T373] l2tp_session_create+0x39/0xb60 [ 24.081764][ T373] pppol2tp_connect+0xbf5/0x1640 [ 24.086694][ T373] __sys_connect+0x3cb/0x450 [ 24.091275][ T373] __x64_sys_connect+0x7a/0x90 [ 24.096029][ T373] x64_sys_call+0x7c/0x9a0 [ 24.100437][ T373] do_syscall_64+0x4c/0xa0 [ 24.104847][ T373] entry_SYSCALL_64_after_hwframe+0x66/0xd0 [ 24.110734][ T373] [ 24.113058][ T373] Freed by task 373: [ 24.116932][ T373] kasan_set_track+0x4a/0x70 [ 24.121511][ T373] kasan_set_free_info+0x23/0x40 [ 24.126438][ T373] ____kasan_slab_free+0x125/0x160 [ 24.131539][ T373] __kasan_slab_free+0x11/0x20 [ 24.136290][ T373] slab_free_freelist_hook+0xc2/0x190 [ 24.141653][ T373] kfree+0xc4/0x270 [ 24.145538][ T373] l2tp_session_put+0xaf/0x1a0 [ 24.150289][ T373] l2tp_session_delete+0x3a9/0x4a0 [ 24.155389][ T373] pppol2tp_release+0x169/0x2b0 [ 24.160233][ T373] sock_close+0xb8/0x200 [ 24.164550][ T373] __fput+0x22b/0x900 [ 24.168520][ T373] ____fput+0x15/0x20 [ 24.172490][ T373] task_work_run+0x127/0x190 [ 24.177070][ T373] exit_to_user_mode_loop+0xd0/0xe0 [ 24.182259][ T373] exit_to_user_mode_prepare+0x87/0xd0 [ 24.187705][ T373] syscall_exit_to_user_mode+0x1a/0x30 [ 24.193155][ T373] do_syscall_64+0x58/0xa0 [ 24.197563][ T373] entry_SYSCALL_64_after_hwframe+0x66/0xd0 [ 24.203445][ T373] [ 24.205753][ T373] The buggy address belongs to the object at ffff8881102f7800 [ 24.205753][ T373] which belongs to the cache kmalloc-512 of size 512 [ 24.219793][ T373] The buggy address is located 336 bytes inside of [ 24.219793][ T373] 512-byte region [ffff8881102f7800, ffff8881102f7a00) [ 24.233066][ T373] The buggy address belongs to the page: [ 24.238697][ T373] page:ffffea000440bd00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1102f4 [ 24.249022][ T373] head:ffffea000440bd00 order:2 compound_mapcount:0 compound_pincount:0 [ 24.257344][ T373] flags: 0x4000000000010200(slab|head|zone=1) [ 24.263407][ T373] raw: 4000000000010200 0000000000000000 0000000100000001 ffff888100042f00 [ 24.271981][ T373] raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000 [ 24.280553][ T373] page dumped because: kasan: bad access detected [ 24.286952][ T373] page_owner tracks the page as allocated [ 24.292660][ T373] page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 104, ts 4098341879, free_ts 0 [ 24.310800][ T373] post_alloc_hook+0x192/0x1b0 [ 24.315568][ T373] prep_new_page+0x1c/0x110 [ 24.320057][ T373] get_page_from_freelist+0x2c3a/0x2cd0 [ 24.325591][ T373] __alloc_pages+0x1a2/0x460 [ 24.330171][ T373] new_slab+0xa0/0x4d0 [ 24.334222][ T373] ___slab_alloc+0x3ac/0x840 [ 24.338807][ T373] __slab_alloc+0x49/0x90 [ 24.343132][ T373] __kmalloc_track_caller+0x169/0x2c0 [ 24.348495][ T373] __alloc_skb+0x210/0x730 [ 24.352904][ T373] alloc_skb_with_frags+0xa8/0x620 [ 24.358010][ T373] sock_alloc_send_pskb+0x87f/0x9a0 [ 24.363207][ T373] unix_dgram_sendmsg+0x6f3/0x19b0 [ 24.368658][ T373] sock_write_iter+0x2a6/0x3a0 [ 24.373411][ T373] vfs_write+0x831/0xfd0 [ 24.377642][ T373] ksys_write+0x14a/0x260 [ 24.381959][ T373] __x64_sys_write+0x7b/0x90 [ 24.386542][ T373] page_owner free stack trace missing [ 24.391909][ T373] [ 24.394223][ T373] Memory state around the buggy address: [ 24.399848][ T373] ffff8881102f7800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 24.407896][ T373] ffff8881102f7880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 24.415949][ T373] >ffff8881102f7900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 24.424001][ T373] ^ [ 24.430666][ T373] ffff8881102f7980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 24.438715][ T373] ffff8881102f7a00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 24.446760][ T373] ================================================================== [ 24.454806][ T373] Disabling lock debugging due to kernel taint