syzkaller syzkaller login: [ 13.163010][ T28] audit: type=1400 audit(1783938769.454:59): avc: denied { transition } for pid=225 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 [ 13.166532][ T28] audit: type=1400 audit(1783938769.454:60): avc: denied { noatsecure } for pid=225 comm="sshd-session" scontext=system_u:system_r:sshd_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 [ 13.169338][ T28] audit: type=1400 audit(1783938769.454:61): avc: denied { write } for pid=225 comm="sh" path="pipe:[8108]" dev="pipefs" ino=8108 scontext=root:sysadm_r:sysadm_t tcontext=system_u:system_r:sshd_t tclass=fifo_file permissive=1 [ 13.172726][ T28] audit: type=1400 audit(1783938769.454:62): avc: denied { rlimitinh } for pid=225 comm="sh" scontext=system_u:system_r:sshd_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 [ 13.175463][ T28] audit: type=1400 audit(1783938769.454:63): avc: denied { siginh } for pid=225 comm="sh" scontext=system_u:system_r:sshd_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 [ 13.181380][ T222] sshd-session (222) used greatest stack depth: 22216 bytes left Warning: Permanently added '10.128.1.5' (ED25519) to the list of known hosts. 2026/07/13 10:32:58 parsed 1 programs 2026/07/13 10:32:58 serving rpc on tcp://33175 [ 22.042486][ T28] audit: type=1400 audit(1783938778.334:64): avc: denied { node_bind } for pid=295 comm="syz-execprog" saddr=::1 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:node_t tclass=tcp_socket permissive=1 [ 22.064118][ T28] audit: type=1400 audit(1783938778.334:65): avc: denied { module_request } for pid=295 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 [ 22.775530][ T28] audit: type=1400 audit(1783938779.064:66): avc: denied { mounton } for pid=303 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 [ 22.776604][ T303] cgroup: Unknown subsys name 'net' [ 22.798398][ T28] audit: type=1400 audit(1783938779.064:67): avc: denied { mount } for pid=303 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 [ 22.825950][ T28] audit: type=1400 audit(1783938779.104:68): avc: denied { unmount } for pid=303 comm="syz-executor" scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:cgroup_t tclass=filesystem permissive=1 [ 22.826137][ T303] cgroup: Unknown subsys name 'devices' [ 22.972877][ T303] cgroup: Unknown subsys name 'hugetlb' [ 22.978491][ T303] cgroup: Unknown subsys name 'rlimit' [ 23.086254][ T28] audit: type=1400 audit(1783938779.374:69): avc: denied { setattr } for pid=303 comm="syz-executor" name="raw-gadget" dev="devtmpfs" ino=258 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:device_t tclass=chr_file permissive=1 [ 23.109924][ T28] audit: type=1400 audit(1783938779.374:70): avc: denied { create } for pid=303 comm="syz-executor" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=netlink_generic_socket permissive=1 [ 23.118038][ T306] SELinux: Context root:object_r:swapfile_t is not valid (left unmapped). [ 23.130645][ T28] audit: type=1400 audit(1783938779.374:71): avc: denied { write } for pid=303 comm="syz-executor" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=netlink_generic_socket permissive=1 [ 23.159554][ T28] audit: type=1400 audit(1783938779.374:72): avc: denied { read } for pid=303 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 [ 23.180063][ T28] audit: type=1400 audit(1783938779.374:73): avc: denied { mounton } for pid=303 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 [ 23.217993][ T303] Adding 124996k swap on ./swap-file. Priority:0 extents:1 across:124996k [ 23.921244][ T308] request_module fs-gadgetfs succeeded, but still no fs? [ 24.059624][ T322] bridge0: port 1(bridge_slave_0) entered blocking state [ 24.067450][ T322] bridge0: port 1(bridge_slave_0) entered disabled state [ 24.075044][ T322] device bridge_slave_0 entered promiscuous mode [ 24.082822][ T322] bridge0: port 2(bridge_slave_1) entered blocking state [ 24.090366][ T322] bridge0: port 2(bridge_slave_1) entered disabled state [ 24.097845][ T318] syz-executor (318) used greatest stack depth: 21856 bytes left [ 24.097982][ T322] device bridge_slave_1 entered promiscuous mode [ 24.142212][ T322] bridge0: port 2(bridge_slave_1) entered blocking state [ 24.149260][ T322] bridge0: port 2(bridge_slave_1) entered forwarding state [ 24.156571][ T322] bridge0: port 1(bridge_slave_0) entered blocking state [ 24.163676][ T322] bridge0: port 1(bridge_slave_0) entered forwarding state [ 24.182401][ T317] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 24.190023][ T317] bridge0: port 1(bridge_slave_0) entered disabled state [ 24.197410][ T317] bridge0: port 2(bridge_slave_1) entered disabled state [ 24.206448][ T317] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 24.214776][ T317] bridge0: port 1(bridge_slave_0) entered blocking state [ 24.221845][ T317] bridge0: port 1(bridge_slave_0) entered forwarding state [ 24.231404][ T317] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 24.239662][ T317] bridge0: port 2(bridge_slave_1) entered blocking state [ 24.246904][ T317] bridge0: port 2(bridge_slave_1) entered forwarding state [ 24.258824][ T317] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 24.268112][ T317] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 24.281839][ T317] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 24.294403][ T317] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 24.302805][ T317] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 24.310213][ T317] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 24.318401][ T322] device veth0_vlan entered promiscuous mode [ 24.329592][ T317] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 24.338720][ T322] device veth1_macvtap entered promiscuous mode [ 24.347675][ T317] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 24.357760][ T317] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready [ 24.392101][ T322] syz-executor (322) used greatest stack depth: 21792 bytes left 2026/07/13 10:33:01 executed programs: 0 [ 25.019394][ T371] bridge0: port 1(bridge_slave_0) entered blocking state [ 25.026477][ T371] bridge0: port 1(bridge_slave_0) entered disabled state [ 25.034167][ T371] device bridge_slave_0 entered promiscuous mode [ 25.047829][ T371] bridge0: port 2(bridge_slave_1) entered blocking state [ 25.054955][ T371] bridge0: port 2(bridge_slave_1) entered disabled state [ 25.062380][ T371] device bridge_slave_1 entered promiscuous mode [ 25.100534][ T371] bridge0: port 2(bridge_slave_1) entered blocking state [ 25.107618][ T371] bridge0: port 2(bridge_slave_1) entered forwarding state [ 25.114921][ T371] bridge0: port 1(bridge_slave_0) entered blocking state [ 25.121950][ T371] bridge0: port 1(bridge_slave_0) entered forwarding state [ 25.131156][ T10] bridge0: port 1(bridge_slave_0) entered disabled state [ 25.138377][ T10] bridge0: port 2(bridge_slave_1) entered disabled state [ 25.158999][ T10] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 25.166647][ T10] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 25.176179][ T10] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 25.184797][ T10] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 25.193132][ T10] bridge0: port 1(bridge_slave_0) entered blocking state [ 25.200145][ T10] bridge0: port 1(bridge_slave_0) entered forwarding state [ 25.212920][ T10] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 25.221386][ T10] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 25.229969][ T10] bridge0: port 2(bridge_slave_1) entered blocking state [ 25.237018][ T10] bridge0: port 2(bridge_slave_1) entered forwarding state [ 25.247701][ T10] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_hsr: link becomes ready [ 25.255922][ T10] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 25.269754][ T10] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_hsr: link becomes ready [ 25.278133][ T10] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 25.290704][ T10] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_virt_wifi: link becomes ready [ 25.299378][ T10] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 25.309788][ T10] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_vlan: link becomes ready [ 25.317907][ T10] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 25.330251][ T10] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 25.338089][ T10] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 25.346177][ T371] device veth0_vlan entered promiscuous mode [ 25.355543][ T10] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_macvtap: link becomes ready [ 25.363994][ T10] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 25.376783][ T371] device veth1_macvtap entered promiscuous mode [ 25.385603][ T10] IPv6: ADDRCONF(NETDEV_CHANGE): macsec0: link becomes ready [ 25.393393][ T10] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_0: link becomes ready [ 25.401689][ T10] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 25.410824][ T10] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready [ 25.419398][ T10] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready [ 25.428598][ T8] device bridge_slave_1 left promiscuous mode [ 25.434807][ T8] bridge0: port 2(bridge_slave_1) entered disabled state [ 25.442348][ T8] device bridge_slave_0 left promiscuous mode [ 25.449226][ T8] bridge0: port 1(bridge_slave_0) entered disabled state [ 25.457370][ T8] device veth1_macvtap left promiscuous mode [ 25.463415][ T8] device veth0_vlan left promiscuous mode [ 25.547793][ T375] ================================================================== [ 25.555880][ T375] BUG: KASAN: use-after-free in mutex_lock+0x86/0x1b0 [ 25.562653][ T375] Write of size 8 at addr ffff888114521950 by task syz.2.17/375 [ 25.570264][ T375] [ 25.572589][ T375] CPU: 0 PID: 375 Comm: syz.2.17 Not tainted syzkaller #0 [ 25.579678][ T375] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 [ 25.589725][ T375] Call Trace: [ 25.592988][ T375] [ 25.595902][ T375] __dump_stack+0x21/0x24 [ 25.600228][ T375] dump_stack_lvl+0x110/0x170 [ 25.604884][ T375] ? __cfi_dump_stack_lvl+0x8/0x8 [ 25.609896][ T375] ? mutex_lock+0x86/0x1b0 [ 25.614748][ T375] print_address_description+0x71/0x200 [ 25.620287][ T375] print_report+0x4a/0x60 [ 25.624604][ T375] kasan_report+0x122/0x150 [ 25.629114][ T375] ? mutex_lock+0x86/0x1b0 [ 25.633519][ T375] kasan_check_range+0x249/0x2a0 [ 25.638444][ T375] __kasan_check_write+0x14/0x20 [ 25.643367][ T375] mutex_lock+0x86/0x1b0 [ 25.647661][ T375] ? __cfi_mutex_lock+0x10/0x10 [ 25.652499][ T375] ? kfree+0x6f/0xf0 [ 25.656379][ T375] ? l2tp_session_put+0xaf/0x1a0 [ 25.661324][ T375] ? l2tp_session_delete+0x3df/0x4d0 [ 25.666617][ T375] pppol2tp_release+0x178/0x2b0 [ 25.671483][ T375] sock_close+0xc9/0x220 [ 25.675732][ T375] ? __cfi_sock_close+0x10/0x10 [ 25.680566][ T375] __fput+0x1fd/0x8f0 [ 25.684536][ T375] ____fput+0x15/0x20 [ 25.688605][ T375] task_work_run+0x1e1/0x250 [ 25.693179][ T375] ? __cfi_task_work_run+0x10/0x10 [ 25.698275][ T375] ? __cfi___close_range+0x10/0x10 [ 25.703391][ T375] exit_to_user_mode_loop+0x9b/0xb0 [ 25.708573][ T375] exit_to_user_mode_prepare+0x87/0xd0 [ 25.714012][ T375] syscall_exit_to_user_mode+0x1a/0x30 [ 25.719458][ T375] do_syscall_64+0x58/0xa0 [ 25.723870][ T375] ? clear_bhb_loop+0x30/0x80 [ 25.728534][ T375] ? clear_bhb_loop+0x30/0x80 [ 25.733205][ T375] entry_SYSCALL_64_after_hwframe+0x68/0xd2 [ 25.739097][ T375] RIP: 0033:0x7efc9519de59 [ 25.743514][ T375] 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 [ 25.763200][ T375] RSP: 002b:00007ffe4e8fc278 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4 [ 25.771658][ T375] RAX: 0000000000000000 RBX: 00007ffe4e8fc360 RCX: 00007efc9519de59 [ 25.779714][ T375] RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003 [ 25.787671][ T375] RBP: 00000000000063b5 R08: 0000000000000001 R09: 0000000000000000 [ 25.795900][ T375] R10: 0000001b33220000 R11: 0000000000000246 R12: 0000000000000000 [ 25.803970][ T375] R13: 00007efc95425fac R14: 00007efc95425fa8 R15: 00007efc95425fa0 [ 25.811964][ T375] [ 25.815008][ T375] [ 25.817312][ T375] Allocated by task 375: [ 25.821544][ T375] kasan_set_track+0x4b/0x70 [ 25.826121][ T375] kasan_save_alloc_info+0x1f/0x30 [ 25.831210][ T375] __kasan_kmalloc+0x95/0xb0 [ 25.835796][ T375] __kmalloc+0xb4/0x1e0 [ 25.839933][ T375] l2tp_session_create+0x38/0xbd0 [ 25.844950][ T375] pppol2tp_connect+0xbf5/0x1640 [ 25.849892][ T375] __sys_connect+0x3da/0x460 [ 25.854493][ T375] __x64_sys_connect+0x7a/0x90 [ 25.859254][ T375] x64_sys_call+0x88d/0x9a0 [ 25.863741][ T375] do_syscall_64+0x4c/0xa0 [ 25.868141][ T375] entry_SYSCALL_64_after_hwframe+0x68/0xd2 [ 25.874024][ T375] [ 25.876353][ T375] Freed by task 375: [ 25.880229][ T375] kasan_set_track+0x4b/0x70 [ 25.884807][ T375] kasan_save_free_info+0x2b/0x40 [ 25.889814][ T375] ____kasan_slab_free+0x132/0x180 [ 25.894915][ T375] __kasan_slab_free+0x11/0x20 [ 25.899692][ T375] slab_free_freelist_hook+0xc2/0x190 [ 25.905069][ T375] __kmem_cache_free+0xb7/0x1b0 [ 25.911106][ T375] kfree+0x6f/0xf0 [ 25.915271][ T375] l2tp_session_put+0xaf/0x1a0 [ 25.920036][ T375] l2tp_session_delete+0x3df/0x4d0 [ 25.925133][ T375] pppol2tp_release+0x169/0x2b0 [ 25.929969][ T375] sock_close+0xc9/0x220 [ 25.934204][ T375] __fput+0x1fd/0x8f0 [ 25.938176][ T375] ____fput+0x15/0x20 [ 25.942176][ T375] task_work_run+0x1e1/0x250 [ 25.946753][ T375] exit_to_user_mode_loop+0x9b/0xb0 [ 25.951936][ T375] exit_to_user_mode_prepare+0x87/0xd0 [ 25.957418][ T375] syscall_exit_to_user_mode+0x1a/0x30 [ 25.962863][ T375] do_syscall_64+0x58/0xa0 [ 25.967266][ T375] entry_SYSCALL_64_after_hwframe+0x68/0xd2 [ 25.973167][ T375] [ 25.975476][ T375] The buggy address belongs to the object at ffff888114521800 [ 25.975476][ T375] which belongs to the cache kmalloc-512 of size 512 [ 25.989539][ T375] The buggy address is located 336 bytes inside of [ 25.989539][ T375] 512-byte region [ffff888114521800, ffff888114521a00) [ 26.002797][ T375] [ 26.005112][ T375] The buggy address belongs to the physical page: [ 26.011516][ T375] page:ffffea0004514800 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x114520 [ 26.021741][ T375] head:ffffea0004514800 order:2 compound_mapcount:0 compound_pincount:0 [ 26.030151][ T375] flags: 0x4000000000010200(slab|head|zone=1) [ 26.036252][ T375] raw: 4000000000010200 0000000000000000 dead000000000122 ffff888100042f00 [ 26.044929][ T375] raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000 [ 26.053608][ T375] page dumped because: kasan: bad access detected [ 26.060005][ T375] page_owner tracks the page as allocated [ 26.066307][ T375] 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 371, tgid 371 (syz-executor), ts 25538881637, free_ts 25173985985 [ 26.090445][ T375] post_alloc_hook+0x1f5/0x210 [ 26.095330][ T375] prep_new_page+0x1c/0x110 [ 26.099826][ T375] get_page_from_freelist+0x2ca9/0x2d20 [ 26.106320][ T375] __alloc_pages+0x1fa/0x610 [ 26.112473][ T375] alloc_slab_page+0x6e/0xf0 [ 26.118192][ T375] new_slab+0x98/0x3e0 [ 26.122683][ T375] ___slab_alloc+0x70f/0xb70 [ 26.127488][ T375] __slab_alloc+0x5e/0xa0 [ 26.132512][ T375] __kmem_cache_alloc_node+0x204/0x2d0 [ 26.137976][ T375] __kmalloc_node+0xa2/0x1e0 [ 26.143398][ T375] qdisc_alloc+0x82/0x750 [ 26.148065][ T375] qdisc_create_dflt+0x6b/0x3a0 [ 26.152901][ T375] dev_activate+0x30e/0x1110 [ 26.158111][ T375] __dev_open+0x40d/0x520 [ 26.162948][ T375] __dev_change_flags+0x1f2/0x6b0 [ 26.168822][ T375] dev_change_flags+0x80/0x1a0 [ 26.173756][ T375] page last free stack trace: [ 26.179381][ T375] free_unref_page_prepare+0x80c/0x820 [ 26.186414][ T375] free_unref_page+0x93/0x530 [ 26.191450][ T375] __free_pages+0x67/0x100 [ 26.196231][ T375] __free_slab+0xc7/0x1a0 [ 26.202165][ T375] __unfreeze_partials+0x15a/0x190 [ 26.207271][ T375] put_cpu_partial+0xa9/0x100 [ 26.211941][ T375] __slab_free+0x1c4/0x280 [ 26.216347][ T375] ___cache_free+0xbf/0xd0 [ 26.220793][ T375] qlist_free_all+0xc6/0x140 [ 26.225366][ T375] kasan_quarantine_reduce+0x14a/0x170 [ 26.230904][ T375] __kasan_slab_alloc+0x24/0x80 [ 26.235744][ T375] slab_post_alloc_hook+0x4f/0x2d0 [ 26.240872][ T375] kmem_cache_alloc_node+0x179/0x330 [ 26.246578][ T375] __alloc_skb+0xe8/0x4a0 [ 26.250888][ T375] alloc_skb_with_frags+0xa8/0x620 [ 26.255987][ T375] sock_alloc_send_pskb+0x87f/0x9a0 [ 26.261172][ T375] [ 26.263479][ T375] Memory state around the buggy address: [ 26.269115][ T375] ffff888114521800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 26.277156][ T375] ffff888114521880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 26.285214][ T375] >ffff888114521900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 26.293278][ T375] ^ [ 26.300110][ T375] ffff888114521980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 26.308526][ T375] ffff888114521a00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 26.316673][ T375] ================================================================== [ 26.325319][ T375] Disabling lock debugging due to kernel taint