audit: type=1400 audit(1763334066.132:8): avc: denied { open } for pid=3669 comm="syz-executor.5" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=perf_event permissive=1 audit: type=1400 audit(1763334066.132:9): avc: denied { kernel } for pid=3669 comm="syz-executor.5" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=perf_event permissive=1 Oops: general protection fault, probably for non-canonical address 0xdffffc0000000017: 0000 [#1] SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x00000000000000b8-0x00000000000000bf] CPU: 1 UID: 0 PID: 3671 Comm: syz-executor.5 Not tainted 6.18.0-rc5-next-20251114 #1 PREEMPT(voluntary) Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 RIP: 0010:put_pid_ns+0x30/0x80 Code: 89 fd 53 e8 42 a0 03 00 48 85 ed 74 3d e8 38 a0 03 00 48 8d bd d0 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 75 35 48 8b 9d d0 00 00 00 bf 08 00 00 00 48 89 de e8 RSP: 0018:ffff88804985fdb0 EFLAGS: 00010216 RAX: dffffc0000000000 RBX: 0000000000000001 RCX: ffffc900009a6000 RDX: 0000000000000017 RSI: ffffffff817193a8 RDI: 00000000000000ba RBP: ffffffffffffffea R08: 0000000000000001 R09: 0000000000000001 R10: ffffffff8664ed57 R11: 0000000000000001 R12: ffff888018e38e38 R13: ffff888018e38fec R14: ffffffff85cfdf20 R15: ffff888015eb5bb8 FS: 00007fe2a900d700(0000) GS:ffff8880e548f000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ff96d640368 CR3: 000000001ef0c000 CR4: 0000000000350ef0 Call Trace: nsproxy_free+0xfa/0x5a0 create_new_namespaces+0x585/0x750 unshare_nsproxy_namespaces+0xc0/0x200 ksys_unshare+0x468/0xa10 __x64_sys_unshare+0x31/0x40 do_syscall_64+0xbf/0x430 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fe2aba97b19 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fe2a900d188 EFLAGS: 00000246 ORIG_RAX: 0000000000000110 RAX: ffffffffffffffda RBX: 00007fe2abbaaf60 RCX: 00007fe2aba97b19 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000002c020600 RBP: 00007fe2abaf1f6d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fffa6114d7f R14: 00007fe2a900d300 R15: 0000000000022000 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:put_pid_ns+0x30/0x80 Code: 89 fd 53 e8 42 a0 03 00 48 85 ed 74 3d e8 38 a0 03 00 48 8d bd d0 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 75 35 48 8b 9d d0 00 00 00 bf 08 00 00 00 48 89 de e8 RSP: 0018:ffff88804985fdb0 EFLAGS: 00010216 RAX: dffffc0000000000 RBX: 0000000000000001 RCX: ffffc900009a6000 RDX: 0000000000000017 RSI: ffffffff817193a8 RDI: 00000000000000ba RBP: ffffffffffffffea R08: 0000000000000001 R09: 0000000000000001 R10: ffffffff8664ed57 R11: 0000000000000001 R12: ffff888018e38e38 R13: ffff888018e38fec R14: ffffffff85cfdf20 R15: ffff888015eb5bb8 FS: 00007fe2a900d700(0000) GS:ffff8880e548f000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ff96d640368 CR3: 000000001ef0c000 CR4: 0000000000350ef0 ieee80211 phy6: Selected rate control algorithm 'minstrel_ht' Zero length message leads to an empty skb wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50 ieee80211 phy7: Selected rate control algorithm 'minstrel_ht' wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50 ieee80211 phy8: Selected rate control algorithm 'minstrel_ht' wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50 ieee80211 phy9: Selected rate control algorithm 'minstrel_ht' wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50 SELinux: security_context_str_to_sid (staff_u) failed with errno=-22 loop2: detected capacity change from 0 to 256 tmpfs: Unsupported parameter 'huge' SELinux: security_context_str_to_sid (staff_u) failed with errno=-22 loop2: detected capacity change from 0 to 256 tmpfs: Unsupported parameter 'huge' ieee80211 phy10: Selected rate control algorithm 'minstrel_ht' wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50 ieee80211 phy11: Selected rate control algorithm 'minstrel_ht' wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50 ieee80211 phy12: Selected rate control algorithm 'minstrel_ht' wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50 ieee80211 phy13: Selected rate control algorithm 'minstrel_ht' wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50 ieee80211 phy14: Selected rate control algorithm 'minstrel_ht' wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50 ieee80211 phy15: Selected rate control algorithm 'minstrel_ht' wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50 ieee80211 phy16: Selected rate control algorithm 'minstrel_ht' wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50 ieee80211 phy17: Selected rate control algorithm 'minstrel_ht' wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50 loop4: detected capacity change from 0 to 264192 loop4: detected capacity change from 0 to 264192 ---------------- Code disassembly (best guess): 0: 89 fd mov %edi,%ebp 2: 53 push %rbx 3: e8 42 a0 03 00 callq 0x3a04a 8: 48 85 ed test %rbp,%rbp b: 74 3d je 0x4a d: e8 38 a0 03 00 callq 0x3a04a 12: 48 8d bd d0 00 00 00 lea 0xd0(%rbp),%rdi 19: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 20: fc ff df 23: 48 89 fa mov %rdi,%rdx 26: 48 c1 ea 03 shr $0x3,%rdx * 2a: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) <-- trapping instruction 2e: 75 35 jne 0x65 30: 48 8b 9d d0 00 00 00 mov 0xd0(%rbp),%rbx 37: bf 08 00 00 00 mov $0x8,%edi 3c: 48 89 de mov %rbx,%rsi 3f: e8 .byte 0xe8