syzkaller syzkaller login: [ 18.462803][ T24] kauditd_printk_skb: 48 callbacks suppressed [ 18.462813][ T24] audit: type=1400 audit(1782162175.729:59): 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 [ 18.466973][ T24] audit: type=1400 audit(1782162175.729:60): 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 [ 18.469946][ T24] audit: type=1400 audit(1782162175.729:61): avc: denied { write } for pid=259 comm="sh" path="pipe:[14497]" dev="pipefs" ino=14497 scontext=root:sysadm_r:sysadm_t tcontext=system_u:system_r:sshd_t tclass=fifo_file permissive=1 [ 18.473105][ T24] audit: type=1400 audit(1782162175.729:62): 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 [ 18.475809][ T24] audit: type=1400 audit(1782162175.729:63): 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 '10.128.0.37' (ED25519) to the list of known hosts. 2026/06/22 21:03:05 parsed 1 programs 2026/06/22 21:03:05 serving rpc on tcp://44985 [ 27.865616][ T24] audit: type=1400 audit(1782162185.129:64): 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 [ 27.886728][ T24] audit: type=1400 audit(1782162185.129:65): 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 [ 27.906311][ T24] audit: type=1400 audit(1782162185.129:66): 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 [ 28.461136][ T24] audit: type=1400 audit(1782162185.729:67): 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 [ 28.462129][ T293] cgroup: Unknown subsys name 'net' [ 28.483771][ T24] audit: type=1400 audit(1782162185.729:68): 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 [ 28.510987][ T24] audit: type=1400 audit(1782162185.759:69): 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 [ 28.511125][ T293] cgroup: Unknown subsys name 'devices' [ 28.589878][ T293] cgroup: Unknown subsys name 'hugetlb' [ 28.595451][ T293] cgroup: Unknown subsys name 'rlimit' [ 28.797011][ T24] audit: type=1400 audit(1782162186.059:70): 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 [ 28.820187][ T24] audit: type=1400 audit(1782162186.059:71): 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 Setting up swapspace version 1, size = 127995904 bytes [ 28.824990][ T297] SELinux: Context root:object_r:swapfile_t is not valid (left unmapped). [ 28.840679][ T24] audit: type=1400 audit(1782162186.059:72): 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 [ 28.869431][ T24] audit: type=1400 audit(1782162186.059:73): 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 [ 28.908167][ T293] Adding 124996k swap on ./swap-file. Priority:0 extents:1 across:124996k [ 29.278383][ T299] request_module fs-gadgetfs succeeded, but still no fs? [ 29.288618][ T299] cgroup: cgroup: disabling cgroup2 socket matching due to net_prio or net_cls activation [ 29.557392][ T327] bridge0: port 1(bridge_slave_0) entered blocking state [ 29.564533][ T327] bridge0: port 1(bridge_slave_0) entered disabled state [ 29.571842][ T327] device bridge_slave_0 entered promiscuous mode [ 29.578515][ T327] bridge0: port 2(bridge_slave_1) entered blocking state [ 29.585537][ T327] bridge0: port 2(bridge_slave_1) entered disabled state [ 29.592740][ T327] device bridge_slave_1 entered promiscuous mode [ 29.623551][ T327] bridge0: port 2(bridge_slave_1) entered blocking state [ 29.630586][ T327] bridge0: port 2(bridge_slave_1) entered forwarding state [ 29.637793][ T327] bridge0: port 1(bridge_slave_0) entered blocking state [ 29.644803][ T327] bridge0: port 1(bridge_slave_0) entered forwarding state [ 29.660489][ T309] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 29.668218][ T309] bridge0: port 1(bridge_slave_0) entered disabled state [ 29.675435][ T309] bridge0: port 2(bridge_slave_1) entered disabled state [ 29.684329][ T309] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 29.692477][ T309] bridge0: port 1(bridge_slave_0) entered blocking state [ 29.699487][ T309] bridge0: port 1(bridge_slave_0) entered forwarding state [ 29.708247][ T309] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 29.716448][ T309] bridge0: port 2(bridge_slave_1) entered blocking state [ 29.723457][ T309] bridge0: port 2(bridge_slave_1) entered forwarding state [ 29.733938][ T309] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 29.743449][ T309] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 29.755130][ T309] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 29.766856][ T309] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 29.774876][ T309] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 29.782648][ T309] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 29.790772][ T327] device veth0_vlan entered promiscuous mode [ 29.800947][ T309] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 29.809755][ T327] device veth1_macvtap entered promiscuous mode [ 29.817721][ T309] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 29.827058][ T309] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready 2026/06/22 21:03:07 executed programs: 0 [ 30.269416][ T363] bridge0: port 1(bridge_slave_0) entered blocking state [ 30.276436][ T363] bridge0: port 1(bridge_slave_0) entered disabled state [ 30.284162][ T363] device bridge_slave_0 entered promiscuous mode [ 30.290938][ T363] bridge0: port 2(bridge_slave_1) entered blocking state [ 30.297939][ T363] bridge0: port 2(bridge_slave_1) entered disabled state [ 30.305370][ T363] device bridge_slave_1 entered promiscuous mode [ 30.346849][ T363] bridge0: port 2(bridge_slave_1) entered blocking state [ 30.353875][ T363] bridge0: port 2(bridge_slave_1) entered forwarding state [ 30.361110][ T363] bridge0: port 1(bridge_slave_0) entered blocking state [ 30.368108][ T363] bridge0: port 1(bridge_slave_0) entered forwarding state [ 30.382939][ T9] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 30.390500][ T9] bridge0: port 1(bridge_slave_0) entered disabled state [ 30.397575][ T9] bridge0: port 2(bridge_slave_1) entered disabled state [ 30.410189][ T9] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 30.418283][ T9] bridge0: port 1(bridge_slave_0) entered blocking state [ 30.425299][ T9] bridge0: port 1(bridge_slave_0) entered forwarding state [ 30.433676][ T9] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 30.441771][ T9] bridge0: port 2(bridge_slave_1) entered blocking state [ 30.448789][ T9] bridge0: port 2(bridge_slave_1) entered forwarding state [ 30.462481][ T9] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 30.471365][ T9] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 30.485398][ T9] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 30.495579][ T9] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 30.503915][ T9] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 30.511355][ T9] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 30.519370][ T363] device veth0_vlan entered promiscuous mode [ 30.529608][ T9] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 30.538760][ T363] device veth1_macvtap entered promiscuous mode [ 30.553337][ T9] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 30.561688][ T9] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready [ 30.582861][ T385] ================================================================== [ 30.590934][ T385] BUG: KASAN: use-after-free in mutex_lock+0x85/0xf0 [ 30.597574][ T385] Write of size 8 at addr ffff888111118550 by task syz.2.17/385 [ 30.605164][ T385] [ 30.607467][ T385] CPU: 0 PID: 385 Comm: syz.2.17 Not tainted syzkaller #0 [ 30.614543][ T385] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 [ 30.624565][ T385] Call Trace: [ 30.627824][ T385] __dump_stack+0x21/0x24 [ 30.632123][ T385] dump_stack_lvl+0x1a7/0x208 [ 30.636767][ T385] ? show_regs_print_info+0x18/0x18 [ 30.641940][ T385] ? thaw_kernel_threads+0x220/0x220 [ 30.647192][ T385] ? debug_smp_processor_id+0x17/0x20 [ 30.652530][ T385] print_address_description+0x7f/0x2c0 [ 30.658049][ T385] ? mutex_lock+0x85/0xf0 [ 30.662347][ T385] kasan_report+0x100/0x140 [ 30.666817][ T385] ? mutex_lock+0x85/0xf0 [ 30.671116][ T385] kasan_check_range+0x249/0x2a0 [ 30.676020][ T385] __kasan_check_write+0x14/0x20 [ 30.680931][ T385] mutex_lock+0x85/0xf0 [ 30.685055][ T385] ? mutex_trylock+0xb0/0xb0 [ 30.689615][ T385] ? l2tp_session_put+0xb2/0x1a0 [ 30.694520][ T385] ? l2tp_session_delete+0x3a9/0x4a0 [ 30.699775][ T385] pppol2tp_release+0x178/0x2b0 [ 30.704593][ T385] sock_close+0xb8/0x200 [ 30.708801][ T385] ? sock_mmap+0xa0/0xa0 [ 30.713008][ T385] __fput+0x2dc/0x730 [ 30.716977][ T385] ____fput+0x15/0x20 [ 30.720927][ T385] task_work_run+0x127/0x190 [ 30.725484][ T385] exit_to_user_mode_loop+0xcb/0xe0 [ 30.730649][ T385] exit_to_user_mode_prepare+0x76/0xa0 [ 30.736074][ T385] syscall_exit_to_user_mode+0x1d/0x40 [ 30.741497][ T385] do_syscall_64+0x3d/0x40 [ 30.745879][ T385] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 30.751745][ T385] RIP: 0033:0x7f557c6bee59 [ 30.756137][ T385] 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 [ 30.775715][ T385] RSP: 002b:00007fff68c30488 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4 [ 30.784099][ T385] RAX: 0000000000000000 RBX: 00007fff68c30570 RCX: 00007f557c6bee59 [ 30.792040][ T385] RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003 [ 30.799982][ T385] RBP: 000000000000776d R08: 0000000000000001 R09: 0000000000000000 [ 30.807927][ T385] R10: 0000001b32a20000 R11: 0000000000000246 R12: 0000000000000000 [ 30.815867][ T385] R13: 00007f557c937fac R14: 00007f557c937fa8 R15: 00007f557c937fa0 [ 30.823812][ T385] [ 30.826110][ T385] Allocated by task 385: [ 30.830323][ T385] __kasan_kmalloc+0xd4/0x100 [ 30.834969][ T385] __kmalloc+0x19f/0x330 [ 30.839184][ T385] l2tp_session_create+0x39/0xb60 [ 30.844176][ T385] pppol2tp_connect+0xbf5/0x1640 [ 30.849080][ T385] __sys_connect+0x3ce/0x450 [ 30.853637][ T385] __x64_sys_connect+0x7a/0x90 [ 30.858368][ T385] do_syscall_64+0x31/0x40 [ 30.862753][ T385] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 30.868611][ T385] [ 30.870906][ T385] Freed by task 385: [ 30.874769][ T385] kasan_set_track+0x4a/0x70 [ 30.879326][ T385] kasan_set_free_info+0x23/0x40 [ 30.884230][ T385] ____kasan_slab_free+0x125/0x160 [ 30.889308][ T385] __kasan_slab_free+0x11/0x20 [ 30.894037][ T385] slab_free_freelist_hook+0xc5/0x190 [ 30.899375][ T385] kfree+0xc0/0x270 [ 30.903153][ T385] l2tp_session_put+0xb2/0x1a0 [ 30.907881][ T385] l2tp_session_delete+0x3a9/0x4a0 [ 30.912963][ T385] pppol2tp_release+0x169/0x2b0 [ 30.917786][ T385] sock_close+0xb8/0x200 [ 30.921994][ T385] __fput+0x2dc/0x730 [ 30.925943][ T385] ____fput+0x15/0x20 [ 30.929891][ T385] task_work_run+0x127/0x190 [ 30.934448][ T385] exit_to_user_mode_loop+0xcb/0xe0 [ 30.939624][ T385] exit_to_user_mode_prepare+0x76/0xa0 [ 30.945052][ T385] syscall_exit_to_user_mode+0x1d/0x40 [ 30.950476][ T385] do_syscall_64+0x3d/0x40 [ 30.954858][ T385] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 30.960714][ T385] [ 30.963014][ T385] The buggy address belongs to the object at ffff888111118400 [ 30.963014][ T385] which belongs to the cache kmalloc-512 of size 512 [ 30.977032][ T385] The buggy address is located 336 bytes inside of [ 30.977032][ T385] 512-byte region [ffff888111118400, ffff888111118600) [ 30.990267][ T385] The buggy address belongs to the page: [ 30.995882][ T385] page:ffffea0004444600 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x111118 [ 31.006084][ T385] head:ffffea0004444600 order:2 compound_mapcount:0 compound_pincount:0 [ 31.014384][ T385] flags: 0x4000000000010200(slab|head) [ 31.019815][ T385] raw: 4000000000010200 dead000000000100 dead000000000122 ffff888100043080 [ 31.028368][ T385] raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000 [ 31.036917][ T385] page dumped because: kasan: bad access detected [ 31.043297][ T385] page_owner tracks the page as allocated [ 31.048997][ T385] page last allocated via order 2, migratetype Unmovable, gfp_mask 0x1d2a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 363, ts 30571662218, free_ts 30546827989 [ 31.068760][ T385] prep_new_page+0x176/0x190 [ 31.073322][ T385] get_page_from_freelist+0x225f/0x23f0 [ 31.078833][ T385] __alloc_pages_nodemask+0x29a/0x640 [ 31.084171][ T385] new_slab+0x84/0x3f0 [ 31.088206][ T385] ___slab_alloc+0x2f8/0x4c0 [ 31.092760][ T385] __slab_alloc+0x63/0xa0 [ 31.097056][ T385] __kmalloc_track_caller+0x1e4/0x310 [ 31.102399][ T385] __alloc_skb+0xdc/0x520 [ 31.106697][ T385] __ipv6_ifa_notify+0x200/0xe70 [ 31.111604][ T385] ipv6_ifa_notify+0x85/0xc0 [ 31.116161][ T385] inet6_addr_add+0x5df/0x970 [ 31.120804][ T385] inet6_rtm_newaddr+0x6e1/0x9c0 [ 31.125711][ T385] rtnetlink_rcv_msg+0x9e9/0xca0 [ 31.130614][ T385] netlink_rcv_skb+0x1e9/0x430 [ 31.135343][ T385] rtnetlink_rcv+0x1c/0x20 [ 31.139727][ T385] netlink_unicast+0x86c/0xa30 [ 31.144452][ T385] page last free stack trace: [ 31.149106][ T385] __free_pages_ok+0x80b/0x830 [ 31.153849][ T385] __free_pages+0xd8/0x390 [ 31.158232][ T385] __free_slab+0xcf/0x190 [ 31.162528][ T385] unfreeze_partials+0x150/0x180 [ 31.167432][ T385] put_cpu_partial+0xc1/0x180 [ 31.172078][ T385] __slab_free+0x2c9/0x3a0 [ 31.176466][ T385] ___cache_free+0x10e/0x130 [ 31.181027][ T385] qlink_free+0x50/0x90 [ 31.185150][ T385] qlist_free_all+0x5f/0xb0 [ 31.189623][ T385] kasan_quarantine_reduce+0x14a/0x160 [ 31.195046][ T385] __kasan_slab_alloc+0x2f/0xe0 [ 31.199867][ T385] slab_post_alloc_hook+0x5d/0x2f0 [ 31.204945][ T385] kmem_cache_alloc+0x15a/0x2d0 [ 31.209765][ T385] sock_alloc_inode+0x1b/0xb0 [ 31.214407][ T385] new_inode_pseudo+0x62/0x210 [ 31.219151][ T385] __sock_create+0x12c/0x770 [ 31.223715][ T385] [ 31.226011][ T385] Memory state around the buggy address: [ 31.231610][ T385] ffff888111118400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 31.239639][ T385] ffff888111118480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 31.247667][ T385] >ffff888111118500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 31.255697][ T385] ^ [ 31.262337][ T385] ffff888111118580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 31.270366][ T385] ffff888111118600: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 31.278390][ T385] ================================================================== [ 31.286419][ T385] Disabling lock debugging due to kernel taint