kernel tried to execute NX-protected page - exploit attempt? (uid: 0) BUG: unable to handle page fault for address: ffffc90000b911b0 #PF: supervisor instruction fetch in kernel mode #PF: error_code(0x0011) - permissions violation PGD 1f5ca9067 P4D 1f5ca9067 PUD 1f5caa067 PMD 1dc534067 PTE 80000001e7ff7163 Oops: 0011 [#1] PREEMPT SMP KASAN CPU: 0 PID: 2205 Comm: syz.0.467 Tainted: G W 5.4.290-syzkaller-00002-g41adfeb3d639 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 RIP: 0010:0xffffc90000b911b0 Code: 00 00 60 11 b9 00 00 c9 ff ff 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 <88> 11 b9 00 00 c9 ff ff 00 00 00 00 00 00 00 00 22 01 00 00 00 00 RSP: 0018:ffff8881f6e09d18 EFLAGS: 00010206 RAX: ffffffff8154e8ca RBX: 0000000000000100 RCX: ffff8881d2976e40 RDX: 0000000000000100 RSI: ffffc90000b911b0 RDI: ffff8881e7ff71c0 RBP: ffff8881f6e09ec8 R08: ffffffff8154e50e R09: 0000000000000003 R10: ffffffffffffffff R11: dffffc0000000001 R12: 00000000ffffae00 R13: dffffc0000000000 R14: ffffc90000b911b0 R15: ffff8881e7ff71c0 FS: 00007f2ebef656c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffc90000b911b0 CR3: 00000001d31b8000 CR4: 00000000003406b0 DR0: 0000200000000300 DR1: 0000200000000300 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1830 __do_softirq+0x23b/0x6b7 kernel/softirq.c:292 invoke_softirq kernel/softirq.c:373 [inline] irq_exit+0x195/0x1c0 kernel/softirq.c:413 exiting_irq arch/x86/include/asm/apic.h:539 [inline] smp_apic_timer_interrupt+0x11a/0x490 arch/x86/kernel/apic/apic.c:1161 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:834 RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x50 kernel/kcov.c:183 Code: 1f 84 00 00 00 00 00 0f 1f 00 be 0c 00 00 00 48 c7 c7 20 b1 f1 85 e8 5f e3 2f 00 c3 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <48> 8b 04 24 65 48 8b 0d 74 42 9e 7e 65 8b 15 79 42 9e 7e f7 c2 00 RSP: 0018:ffff8881e9716e40 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: ffffffff8100703a RBX: ffff8881e9716f80 RCX: 897ce3bb850b2100 RDX: 0000000000000000 RSI: ffffffff8100703a RDI: ffff8881e9716f80 RBP: ffff8881e9716f30 R08: dffffc0000000000 R09: ffff8881e9716ef0 R10: 0000000000000000 R11: dffffc0000000001 R12: ffff8881d2976e40 R13: ffffffff8153c430 R14: dffffc0000000000 R15: 0000000000000000 stack_trace_consume_entry+0x25/0x240 kernel/stacktrace.c:83 arch_stack_walk+0x105/0x140 arch/x86/kernel/stacktrace.c:27 stack_trace_save+0x118/0x1c0 kernel/stacktrace.c:123 save_stack mm/kasan/common.c:70 [inline] set_track mm/kasan/common.c:78 [inline] __kasan_kmalloc+0x171/0x210 mm/kasan/common.c:529 slab_post_alloc_hook mm/slab.h:584 [inline] slab_alloc_node mm/slub.c:2829 [inline] slab_alloc mm/slub.c:2837 [inline] kmem_cache_alloc+0xd9/0x250 mm/slub.c:2842 kmem_cache_zalloc include/linux/slab.h:680 [inline] __kernfs_new_node+0xdb/0x6e0 fs/kernfs/dir.c:639 kernfs_new_node+0x130/0x230 fs/kernfs/dir.c:717 __kernfs_create_file+0x45/0x260 fs/kernfs/file.c:1001 sysfs_add_file_mode_ns+0x292/0x340 fs/sysfs/file.c:306 create_files fs/sysfs/group.c:63 [inline] internal_create_group+0x573/0xf00 fs/sysfs/group.c:148 internal_create_groups fs/sysfs/group.c:188 [inline] sysfs_create_groups+0x52/0x110 fs/sysfs/group.c:214 device_add_groups drivers/base/core.c:2007 [inline] device_add_attrs+0x138/0x370 drivers/base/core.c:2166 device_add+0x4f4/0xbb0 drivers/base/core.c:2862 netdev_register_kobject+0x176/0x310 net/core/net-sysfs.c:1854 register_netdevice+0xbc5/0x12a0 net/core/dev.c:9209 register_netdev+0x37/0x50 net/core/dev.c:9338 ip6_tnl_init_net+0x2c6/0x370 net/ipv6/ip6_tunnel.c:2261 ops_init+0x1d4/0x4a0 net/core/net_namespace.c:141 setup_net+0x214/0x990 net/core/net_namespace.c:348 copy_net_ns+0x30d/0x510 net/core/net_namespace.c:489 create_new_namespaces+0x47a/0x570 kernel/nsproxy.c:103 copy_namespaces+0x169/0x1b0 kernel/nsproxy.c:161 copy_process+0x12da/0x3230 kernel/fork.c:2055 _do_fork+0x197/0x900 kernel/fork.c:2399 __do_sys_clone kernel/fork.c:2557 [inline] __se_sys_clone kernel/fork.c:2538 [inline] __x64_sys_clone+0x26b/0x2c0 kernel/fork.c:2538 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 RIP: 0033:0x7f2ec08fb169 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f2ebef64fe8 EFLAGS: 00000206 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 00007f2ec0b13fa0 RCX: 00007f2ec08fb169 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000640c7000 RBP: 00007f2ec097c2a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f2ec0b13fa0 R15: 00007fff8ca3f388 Modules linked in: CR2: ffffc90000b911b0 ---[ end trace a41982eaaa046b88 ]--- RIP: 0010:0xffffc90000b911b0 Code: 00 00 60 11 b9 00 00 c9 ff ff 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 <88> 11 b9 00 00 c9 ff ff 00 00 00 00 00 00 00 00 22 01 00 00 00 00 RSP: 0018:ffff8881f6e09d18 EFLAGS: 00010206 RAX: ffffffff8154e8ca RBX: 0000000000000100 RCX: ffff8881d2976e40 RDX: 0000000000000100 RSI: ffffc90000b911b0 RDI: ffff8881e7ff71c0 RBP: ffff8881f6e09ec8 R08: ffffffff8154e50e R09: 0000000000000003 R10: ffffffffffffffff R11: dffffc0000000001 R12: 00000000ffffae00 R13: dffffc0000000000 R14: ffffc90000b911b0 R15: ffff8881e7ff71c0 FS: 00007f2ebef656c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffc90000b911b0 CR3: 00000001d31b8000 CR4: 00000000003406b0 DR0: 0000200000000300 DR1: 0000200000000300 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 ---------------- Code disassembly (best guess), 1 bytes skipped: 0: 84 00 test %al,(%rax) 2: 00 00 add %al,(%rax) 4: 00 00 add %al,(%rax) 6: 0f 1f 00 nopl (%rax) 9: be 0c 00 00 00 mov $0xc,%esi e: 48 c7 c7 20 b1 f1 85 mov $0xffffffff85f1b120,%rdi 15: e8 5f e3 2f 00 call 0x2fe379 1a: c3 ret 1b: 90 nop 1c: 90 nop 1d: 90 nop 1e: 90 nop 1f: 90 nop 20: 90 nop 21: 90 nop 22: 90 nop 23: 90 nop 24: 90 nop 25: 90 nop 26: 90 nop 27: 90 nop 28: 90 nop * 29: 48 8b 04 24 mov (%rsp),%rax <-- trapping instruction 2d: 65 48 8b 0d 74 42 9e mov %gs:0x7e9e4274(%rip),%rcx # 0x7e9e42a9 34: 7e 35: 65 8b 15 79 42 9e 7e mov %gs:0x7e9e4279(%rip),%edx # 0x7e9e42b5 3c: f7 .byte 0xf7 3d: c2 .byte 0xc2