syzkaller syzkaller login: [ 14.898486][ T30] kauditd_printk_skb: 48 callbacks suppressed [ 14.898499][ T30] audit: type=1400 audit(1784034754.461:59): avc: denied { transition } for pid=223 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 [ 14.904030][ T30] audit: type=1400 audit(1784034754.461:60): avc: denied { noatsecure } for pid=223 comm="sshd-session" scontext=system_u:system_r:sshd_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 [ 14.907495][ T30] audit: type=1400 audit(1784034754.461:61): avc: denied { write } for pid=223 comm="sh" path="pipe:[14133]" dev="pipefs" ino=14133 scontext=root:sysadm_r:sysadm_t tcontext=system_u:system_r:sshd_t tclass=fifo_file permissive=1 [ 14.910910][ T30] audit: type=1400 audit(1784034754.461:62): avc: denied { rlimitinh } for pid=223 comm="sh" scontext=system_u:system_r:sshd_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 [ 14.914247][ T30] audit: type=1400 audit(1784034754.461:63): avc: denied { siginh } for pid=223 comm="sh" scontext=system_u:system_r:sshd_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 [ 16.506075][ T230] sshd-session (230) used greatest stack depth: 21024 bytes left Warning: Permanently added '10.128.1.54' (ED25519) to the list of known hosts. 2026/07/14 13:12:43 parsed 1 programs 2026/07/14 13:12:43 serving rpc on tcp://37369 [ 23.816315][ T30] audit: type=1400 audit(1784034763.381:64): 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 [ 23.837049][ T30] audit: type=1400 audit(1784034763.381:65): 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 [ 24.417953][ T30] audit: type=1400 audit(1784034763.981:66): avc: denied { mounton } for pid=299 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 [ 24.419097][ T299] cgroup: Unknown subsys name 'net' [ 24.440715][ T30] audit: type=1400 audit(1784034763.981:67): avc: denied { mount } for pid=299 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 [ 24.468033][ T30] audit: type=1400 audit(1784034764.021:68): avc: denied { unmount } for pid=299 comm="syz-executor" scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:cgroup_t tclass=filesystem permissive=1 [ 24.468194][ T299] cgroup: Unknown subsys name 'devices' [ 24.613365][ T299] cgroup: Unknown subsys name 'hugetlb' [ 24.618979][ T299] cgroup: Unknown subsys name 'rlimit' [ 24.759806][ T30] audit: type=1400 audit(1784034764.321:69): avc: denied { setattr } for pid=299 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 [ 24.783032][ T30] audit: type=1400 audit(1784034764.321:70): avc: denied { create } for pid=299 comm="syz-executor" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=netlink_generic_socket permissive=1 [ 24.803466][ T30] audit: type=1400 audit(1784034764.321:71): avc: denied { write } for pid=299 comm="syz-executor" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=netlink_generic_socket permissive=1 [ 24.809001][ T303] SELinux: Context root:object_r:swapfile_t is not valid (left unmapped). [ 24.823824][ T30] audit: type=1400 audit(1784034764.321:72): avc: denied { read } for pid=299 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 [ 24.852575][ T30] audit: type=1400 audit(1784034764.321:73): avc: denied { mounton } for pid=299 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 [ 24.886535][ T299] Adding 124996k swap on ./swap-file. Priority:0 extents:1 across:124996k [ 25.273787][ T306] request_module fs-gadgetfs succeeded, but still no fs? [ 25.606010][ T334] bridge0: port 1(bridge_slave_0) entered blocking state [ 25.613129][ T334] bridge0: port 1(bridge_slave_0) entered disabled state [ 25.620515][ T334] device bridge_slave_0 entered promiscuous mode [ 25.627389][ T334] bridge0: port 2(bridge_slave_1) entered blocking state [ 25.635020][ T334] bridge0: port 2(bridge_slave_1) entered disabled state [ 25.642498][ T334] device bridge_slave_1 entered promiscuous mode [ 25.676367][ T334] bridge0: port 2(bridge_slave_1) entered blocking state [ 25.683434][ T334] bridge0: port 2(bridge_slave_1) entered forwarding state [ 25.690675][ T334] bridge0: port 1(bridge_slave_0) entered blocking state [ 25.697701][ T334] bridge0: port 1(bridge_slave_0) entered forwarding state [ 25.715199][ T45] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 25.722904][ T45] bridge0: port 1(bridge_slave_0) entered disabled state [ 25.730237][ T45] bridge0: port 2(bridge_slave_1) entered disabled state [ 25.739215][ T45] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 25.747646][ T45] bridge0: port 1(bridge_slave_0) entered blocking state [ 25.754711][ T45] bridge0: port 1(bridge_slave_0) entered forwarding state [ 25.764101][ T45] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 25.772304][ T45] bridge0: port 2(bridge_slave_1) entered blocking state [ 25.779414][ T45] bridge0: port 2(bridge_slave_1) entered forwarding state [ 25.790358][ T45] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 25.800152][ T45] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 25.813141][ T45] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 25.824897][ T45] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 25.833054][ T45] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 25.840418][ T45] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 25.849262][ T334] device veth0_vlan entered promiscuous mode [ 25.861040][ T334] device veth1_macvtap entered promiscuous mode [ 25.868076][ T45] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 25.878691][ T45] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 25.888394][ T45] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready 2026/07/14 13:12:45 executed programs: 0 [ 26.240248][ T367] bridge0: port 1(bridge_slave_0) entered blocking state [ 26.247374][ T367] bridge0: port 1(bridge_slave_0) entered disabled state [ 26.255084][ T367] device bridge_slave_0 entered promiscuous mode [ 26.266652][ T367] bridge0: port 2(bridge_slave_1) entered blocking state [ 26.273847][ T367] bridge0: port 2(bridge_slave_1) entered disabled state [ 26.281093][ T367] device bridge_slave_1 entered promiscuous mode [ 26.318320][ T367] bridge0: port 2(bridge_slave_1) entered blocking state [ 26.325379][ T367] bridge0: port 2(bridge_slave_1) entered forwarding state [ 26.332640][ T367] bridge0: port 1(bridge_slave_0) entered blocking state [ 26.339654][ T367] bridge0: port 1(bridge_slave_0) entered forwarding state [ 26.347874][ T45] bridge0: port 1(bridge_slave_0) entered disabled state [ 26.355286][ T45] bridge0: port 2(bridge_slave_1) entered disabled state [ 26.373144][ T45] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 26.380621][ T45] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 26.389015][ T45] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 26.397378][ T45] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 26.405563][ T45] bridge0: port 1(bridge_slave_0) entered blocking state [ 26.412785][ T45] bridge0: port 1(bridge_slave_0) entered forwarding state [ 26.421539][ T45] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 26.430012][ T45] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 26.438398][ T45] bridge0: port 2(bridge_slave_1) entered blocking state [ 26.445471][ T45] bridge0: port 2(bridge_slave_1) entered forwarding state [ 26.455557][ T45] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_hsr: link becomes ready [ 26.463933][ T45] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 26.477162][ T45] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_hsr: link becomes ready [ 26.485226][ T45] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 26.497220][ T45] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_virt_wifi: link becomes ready [ 26.505799][ T45] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 26.518180][ T367] device veth0_vlan entered promiscuous mode [ 26.525204][ T45] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_vlan: link becomes ready [ 26.533166][ T45] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 26.541332][ T45] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 26.549077][ T45] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 26.560655][ T45] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_macvtap: link becomes ready [ 26.569134][ T45] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 26.578397][ T367] device veth1_macvtap entered promiscuous mode [ 26.588646][ T45] IPv6: ADDRCONF(NETDEV_CHANGE): macsec0: link becomes ready [ 26.596432][ T45] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_0: link becomes ready [ 26.605206][ T45] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 26.618763][ T45] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready [ 26.627057][ T45] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready [ 26.646336][ T372] ================================================================== [ 26.654435][ T372] BUG: KASAN: use-after-free in mutex_lock+0x8e/0x1c0 [ 26.661212][ T372] Write of size 8 at addr ffff88812dbbb550 by task syz.2.17/372 [ 26.668824][ T372] [ 26.671136][ T372] CPU: 1 PID: 372 Comm: syz.2.17 Not tainted syzkaller #0 [ 26.678217][ T372] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 [ 26.688265][ T372] Call Trace: [ 26.691528][ T372] [ 26.694435][ T372] __dump_stack+0x21/0x30 [ 26.698739][ T372] dump_stack_lvl+0x110/0x170 [ 26.703391][ T372] ? show_regs_print_info+0x20/0x20 [ 26.708655][ T372] ? load_image+0x3f0/0x3f0 [ 26.713129][ T372] print_address_description+0x7f/0x2c0 [ 26.718648][ T372] ? mutex_lock+0x8e/0x1c0 [ 26.723039][ T372] kasan_report+0x10f/0x150 [ 26.727517][ T372] ? mutex_lock+0x8e/0x1c0 [ 26.731915][ T372] kasan_check_range+0x249/0x2a0 [ 26.736858][ T372] __kasan_check_write+0x14/0x20 [ 26.741789][ T372] mutex_lock+0x8e/0x1c0 [ 26.746053][ T372] ? wait_for_completion_killable_timeout+0x10/0x10 [ 26.752642][ T372] ? l2tp_session_put+0xaf/0x1a0 [ 26.757668][ T372] ? l2tp_session_delete+0x3a9/0x4a0 [ 26.763011][ T372] pppol2tp_release+0x178/0x2b0 [ 26.767850][ T372] sock_close+0xb8/0x200 [ 26.772073][ T372] ? sock_mmap+0xa0/0xa0 [ 26.776288][ T372] __fput+0x22b/0x900 [ 26.780244][ T372] ____fput+0x15/0x20 [ 26.784222][ T372] task_work_run+0x127/0x190 [ 26.788791][ T372] exit_to_user_mode_loop+0xd0/0xe0 [ 26.793963][ T372] exit_to_user_mode_prepare+0x87/0xd0 [ 26.799395][ T372] syscall_exit_to_user_mode+0x1a/0x30 [ 26.804829][ T372] do_syscall_64+0x58/0xa0 [ 26.809218][ T372] ? clear_bhb_loop+0x50/0xa0 [ 26.813870][ T372] ? clear_bhb_loop+0x50/0xa0 [ 26.818522][ T372] entry_SYSCALL_64_after_hwframe+0x66/0xd0 [ 26.824388][ T372] RIP: 0033:0x7f3141c1fe59 [ 26.828777][ T372] 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 [ 26.848365][ T372] RSP: 002b:00007fff28283ec8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4 [ 26.856777][ T372] RAX: 0000000000000000 RBX: 00007fff28283fb0 RCX: 00007f3141c1fe59 [ 26.864724][ T372] RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003 [ 26.872669][ T372] RBP: 0000000000006809 R08: 0000000000000001 R09: 0000000000000000 [ 26.880617][ T372] R10: 0000001b32e20000 R11: 0000000000000246 R12: 0000000000000000 [ 26.888574][ T372] R13: 00007f3141ea7fac R14: 00007f3141ea7fa8 R15: 00007f3141ea7fa0 [ 26.896536][ T372] [ 26.899537][ T372] [ 26.901837][ T372] Allocated by task 372: [ 26.906057][ T372] __kasan_kmalloc+0xd4/0x100 [ 26.910716][ T372] __kmalloc+0x13d/0x2c0 [ 26.914928][ T372] l2tp_session_create+0x39/0xb60 [ 26.920099][ T372] pppol2tp_connect+0xbf5/0x1640 [ 26.925010][ T372] __sys_connect+0x3cb/0x450 [ 26.929571][ T372] __x64_sys_connect+0x7a/0x90 [ 26.934305][ T372] x64_sys_call+0x7c/0x9a0 [ 26.938697][ T372] do_syscall_64+0x4c/0xa0 [ 26.943090][ T372] entry_SYSCALL_64_after_hwframe+0x66/0xd0 [ 26.948972][ T372] [ 26.951275][ T372] Freed by task 372: [ 26.955156][ T372] kasan_set_track+0x4a/0x70 [ 26.959746][ T372] kasan_set_free_info+0x23/0x40 [ 26.964705][ T372] ____kasan_slab_free+0x125/0x160 [ 26.969794][ T372] __kasan_slab_free+0x11/0x20 [ 26.974559][ T372] slab_free_freelist_hook+0xc2/0x190 [ 26.979910][ T372] kfree+0xc4/0x270 [ 26.983692][ T372] l2tp_session_put+0xaf/0x1a0 [ 26.988430][ T372] l2tp_session_delete+0x3a9/0x4a0 [ 26.993522][ T372] pppol2tp_release+0x169/0x2b0 [ 26.998368][ T372] sock_close+0xb8/0x200 [ 27.002597][ T372] __fput+0x22b/0x900 [ 27.006700][ T372] ____fput+0x15/0x20 [ 27.010665][ T372] task_work_run+0x127/0x190 [ 27.015235][ T372] exit_to_user_mode_loop+0xd0/0xe0 [ 27.020423][ T372] exit_to_user_mode_prepare+0x87/0xd0 [ 27.025861][ T372] syscall_exit_to_user_mode+0x1a/0x30 [ 27.031303][ T372] do_syscall_64+0x58/0xa0 [ 27.035694][ T372] entry_SYSCALL_64_after_hwframe+0x66/0xd0 [ 27.041561][ T372] [ 27.043864][ T372] The buggy address belongs to the object at ffff88812dbbb400 [ 27.043864][ T372] which belongs to the cache kmalloc-512 of size 512 [ 27.057914][ T372] The buggy address is located 336 bytes inside of [ 27.057914][ T372] 512-byte region [ffff88812dbbb400, ffff88812dbbb600) [ 27.071169][ T372] The buggy address belongs to the page: [ 27.076788][ T372] page:ffffea0004b6ee00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x12dbb8 [ 27.087010][ T372] head:ffffea0004b6ee00 order:2 compound_mapcount:0 compound_pincount:0 [ 27.095311][ T372] flags: 0x4000000000010200(slab|head|zone=1) [ 27.101393][ T372] raw: 4000000000010200 0000000000000000 dead000000000122 ffff888100042f00 [ 27.109951][ T372] raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000 [ 27.118504][ T372] page dumped because: kasan: bad access detected [ 27.124897][ T372] page_owner tracks the page as allocated [ 27.130606][ T372] 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 45, ts 26635206756, free_ts 26558237527 [ 27.150899][ T372] post_alloc_hook+0x192/0x1b0 [ 27.155654][ T372] prep_new_page+0x1c/0x110 [ 27.160129][ T372] get_page_from_freelist+0x2c3a/0x2cd0 [ 27.165647][ T372] __alloc_pages+0x1a2/0x460 [ 27.170208][ T372] new_slab+0xa0/0x4d0 [ 27.174249][ T372] ___slab_alloc+0x3ac/0x840 [ 27.178832][ T372] __slab_alloc+0x49/0x90 [ 27.183138][ T372] __kmalloc+0x16a/0x2c0 [ 27.187355][ T372] fib6_info_alloc+0x34/0xe0 [ 27.191914][ T372] ip6_route_info_create+0x51b/0x14d0 [ 27.197280][ T372] addrconf_f6i_alloc+0x19c/0x3f0 [ 27.202292][ T372] ipv6_add_addr+0x442/0xd90 [ 27.206855][ T372] addrconf_add_linklocal+0x209/0x660 [ 27.212225][ T372] addrconf_addr_gen+0x53f/0x6a0 [ 27.217139][ T372] addrconf_init_auto_addrs+0x867/0xbd0 [ 27.222656][ T372] addrconf_notify+0x95d/0xe00 [ 27.227409][ T372] page last free stack trace: [ 27.232050][ T372] free_unref_page_prepare+0x5fa/0x600 [ 27.237507][ T372] free_unref_page+0xae/0x540 [ 27.242157][ T372] __free_pages+0x6c/0x100 [ 27.246547][ T372] free_pages+0x82/0x90 [ 27.250680][ T372] __stack_depot_save+0x453/0x480 [ 27.255696][ T372] kasan_set_track+0x5b/0x70 [ 27.260260][ T372] kasan_set_free_info+0x23/0x40 [ 27.265172][ T372] ____kasan_slab_free+0x125/0x160 [ 27.270266][ T372] __kasan_slab_free+0x11/0x20 [ 27.275024][ T372] slab_free_freelist_hook+0xc2/0x190 [ 27.280373][ T372] kfree+0xc4/0x270 [ 27.284180][ T372] kvfree+0x35/0x40 [ 27.287972][ T372] xt_free_table_info+0x165/0x1b0 [ 27.292969][ T372] ipt_unregister_table_exit+0x1b8/0x230 [ 27.298575][ T372] iptable_nat_net_exit+0x1c/0x20 [ 27.303572][ T372] cleanup_net+0x58e/0xae0 [ 27.307975][ T372] [ 27.310275][ T372] Memory state around the buggy address: [ 27.315884][ T372] ffff88812dbbb400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 27.323928][ T372] ffff88812dbbb480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 27.331969][ T372] >ffff88812dbbb500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 27.340020][ T372] ^ [ 27.346665][ T372] ffff88812dbbb580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 27.354706][ T372] ffff88812dbbb600: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 27.362751][ T372] ================================================================== [ 27.370816][ T372] Disabling lock debugging due to kernel taint