================================================================== BUG: KASAN: slab-use-after-free in xfrm_alloc_spi+0xf69/0x1220 Read of size 4 at addr ffff88804cc400c4 by task syz-executor.1/99681 CPU: 1 UID: 0 PID: 99681 Comm: syz-executor.1 Not tainted 6.16.0-rc5-next-20250708 #1 PREEMPT(voluntary) Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 Call Trace: dump_stack_lvl+0xca/0x120 print_report+0xcb/0x5f0 kasan_report+0xca/0x100 xfrm_alloc_spi+0xf69/0x1220 xfrm_alloc_userspi+0x609/0xbb0 xfrm_user_rcv_msg+0x459/0xa00 netlink_rcv_skb+0x147/0x430 xfrm_netlink_rcv+0x74/0x90 netlink_unicast+0x53d/0x7f0 netlink_sendmsg+0x8ac/0xd80 ____sys_sendmsg+0xa67/0xc20 ___sys_sendmsg+0x10f/0x1b0 __sys_sendmsg+0x150/0x200 do_syscall_64+0xbf/0x360 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fb64af39b19 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:00007fb6484af188 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fb64b04cf60 RCX: 00007fb64af39b19 RDX: 0000000000000000 RSI: 0000000020000400 RDI: 0000000000000003 RBP: 00007fb64af93f6d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffcce4e2b2f R14: 00007fb6484af300 R15: 0000000000022000 Allocated by task 36614: kasan_save_stack+0x24/0x50 kasan_save_track+0x14/0x30 __kasan_slab_alloc+0x59/0x70 kmem_cache_alloc_noprof+0x13c/0x470 xfrm_state_alloc+0x25/0x600 __find_acq_core+0x9c8/0x27a0 xfrm_find_acq+0x7f/0xb0 xfrm_alloc_userspi+0x58b/0xbb0 xfrm_user_rcv_msg+0x459/0xa00 netlink_rcv_skb+0x147/0x430 xfrm_netlink_rcv+0x74/0x90 netlink_unicast+0x53d/0x7f0 netlink_sendmsg+0x8ac/0xd80 ____sys_sendmsg+0xa67/0xc20 ___sys_sendmsg+0x10f/0x1b0 __sys_sendmsg+0x150/0x200 do_syscall_64+0xbf/0x360 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 33937: kasan_save_stack+0x24/0x50 kasan_save_track+0x14/0x30 kasan_save_free_info+0x3a/0x60 __kasan_slab_free+0x38/0x50 kmem_cache_free+0x2a1/0x460 xfrm_state_gc_task+0x112/0x170 process_one_work+0x8e1/0x19c0 worker_thread+0x67e/0xe90 kthread+0x3c8/0x740 ret_from_fork+0x34b/0x430 ret_from_fork_asm+0x1a/0x30 The buggy address belongs to the object at ffff88804cc40000 which belongs to the cache xfrm_state of size 920 The buggy address is located 196 bytes inside of freed 920-byte region [ffff88804cc40000, ffff88804cc40398) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff88804cc40880 pfn:0x4cc40 head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0x100000000000040(head|node=0|zone=1) page_type: f5(slab) raw: 0100000000000040 ffff88800a7ad780 dead000000000122 0000000000000000 raw: ffff88804cc40880 00000000800f000d 00000000f5000000 0000000000000000 head: 0100000000000040 ffff88800a7ad780 dead000000000122 0000000000000000 head: ffff88804cc40880 00000000800f000d 00000000f5000000 0000000000000000 head: 0100000000000002 ffffea0001331001 00000000ffffffff 00000000ffffffff head: ffff88804cc41580 0000000000000000 00000000ffffffff 0000000000000004 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88804cc3ff80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88804cc40000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88804cc40080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88804cc40100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88804cc40180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== loop1: detected capacity change from 0 to 8336 EXT4-fs (loop1): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: none. EXT4-fs (loop1): unmounting filesystem 00000000-0000-0000-0000-000000000000. loop1: detected capacity change from 0 to 8336 EXT4-fs (loop1): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: none. netlink: 12 bytes leftover after parsing attributes in process `syz-executor.7'. EXT4-fs (loop1): unmounting filesystem 00000000-0000-0000-0000-000000000000. loop1: detected capacity change from 0 to 8336 EXT4-fs (loop1): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: none. EXT4-fs (loop1): unmounting filesystem 00000000-0000-0000-0000-000000000000. netlink: 12 bytes leftover after parsing attributes in process `syz-executor.7'. netlink: 12 bytes leftover after parsing attributes in process `syz-executor.2'. netlink: 12 bytes leftover after parsing attributes in process `syz-executor.7'. netlink: 12 bytes leftover after parsing attributes in process `syz-executor.2'. netlink: 12 bytes leftover after parsing attributes in process `syz-executor.2'. netlink: 12 bytes leftover after parsing attributes in process `syz-executor.7'. audit: type=1326 audit(1751971053.071:137): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=102586 comm="syz-executor.6" exe="/syz-executor.6" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7f0693071b19 code=0x0 audit: type=1326 audit(1751971053.901:138): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=102586 comm="syz-executor.6" exe="/syz-executor.6" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7f0693071b19 code=0x0 audit: type=1326 audit(1751971054.136:139): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=102635 comm="syz-executor.6" exe="/syz-executor.6" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7f0693071b19 code=0x0 audit: type=1326 audit(1751971054.205:140): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=102643 comm="syz-executor.5" exe="/syz-executor.5" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7fec4cb31b19 code=0x0 audit: type=1326 audit(1751971055.158:141): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=102691 comm="syz-executor.5" exe="/syz-executor.5" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7fec4cb31b19 code=0x0 sr 1:0:0:0: [sr0] CDROM not ready. Make sure there is a disc in the drive. audit: type=1326 audit(1751971055.222:142): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=102689 comm="syz-executor.6" exe="/syz-executor.6" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7f0693071b19 code=0x0 sr 1:0:0:0: [sr0] CDROM not ready. Make sure there is a disc in the drive. Bluetooth: hci4: command 0x0405 tx timeout program syz-executor.2 is using a deprecated SCSI ioctl, please convert it to SG_IO program syz-executor.2 is using a deprecated SCSI ioctl, please convert it to SG_IO audit: type=1326 audit(1751971056.108:143): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=102892 comm="syz-executor.5" exe="/syz-executor.5" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7fec4cb31b19 code=0x0 sr 1:0:0:0: [sr0] CDROM not ready. Make sure there is a disc in the drive. sr 1:0:0:0: [sr0] CDROM not ready. Make sure there is a disc in the drive. audit: type=1326 audit(1751971056.188:144): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=102901 comm="syz-executor.6" exe="/syz-executor.6" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7f0693071b19 code=0x0 program syz-executor.2 is using a deprecated SCSI ioctl, please convert it to SG_IO sr 1:0:0:0: [sr0] CDROM not ready. Make sure there is a disc in the drive. sr 1:0:0:0: [sr0] CDROM not ready. Make sure there is a disc in the drive.