================================================================== BUG: KASAN: slab-use-after-free in vma_multi_allowed+0x172/0x1b0 Read of size 8 at addr ffff88804442d558 by task syz-executor.3/60325 CPU: 1 UID: 0 PID: 60325 Comm: syz-executor.3 Not tainted 6.17.0-rc1-next-20250814 #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/0x610 kasan_report+0xca/0x100 vma_multi_allowed+0x172/0x1b0 __do_sys_mremap+0xcb7/0x1410 do_syscall_64+0xbf/0x360 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fa360255b19 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:00007fa35d7cb188 EFLAGS: 00000246 ORIG_RAX: 0000000000000019 RAX: ffffffffffffffda RBX: 00007fa360368f60 RCX: 00007fa360255b19 RDX: 0000000000002000 RSI: 0000000000002000 RDI: 0000000020cb7000 RBP: 00007fa3602aff6d R08: 0000000020eb3000 R09: 0000000000000000 R10: 0000000000000007 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffe9e40292f R14: 00007fa35d7cb300 R15: 0000000000022000 Allocated by task 60325: kasan_save_stack+0x24/0x50 kasan_save_track+0x14/0x30 __kasan_slab_alloc+0x59/0x70 kmem_cache_alloc_noprof+0x13c/0x3d0 vm_area_dup+0x25/0x6f0 __split_vma+0x179/0xde0 vms_gather_munmap_vmas+0x340/0xc70 do_vmi_align_munmap+0x25b/0x550 do_vmi_munmap+0x1eb/0x3c0 __vm_munmap+0x190/0x370 __x64_sys_munmap+0x59/0x80 do_syscall_64+0xbf/0x360 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 22: kasan_save_stack+0x24/0x50 kasan_save_track+0x14/0x30 __kasan_save_free_info+0x3a/0x60 __kasan_slab_free+0x3f/0x50 slab_free_after_rcu_debug+0xd6/0x290 rcu_core+0x7c8/0x1800 handle_softirqs+0x1b1/0x770 run_ksoftirqd+0x2e/0x60 smpboot_thread_fn+0x41d/0x9d0 kthread+0x3c8/0x740 ret_from_fork+0x34b/0x430 ret_from_fork_asm+0x1a/0x30 Last potentially related work creation: kasan_save_stack+0x24/0x50 kasan_record_aux_stack+0x89/0xa0 kmem_cache_free+0x145/0x460 vms_complete_munmap_vmas+0x549/0x9f0 do_vmi_align_munmap+0x3db/0x550 do_vmi_munmap+0x1eb/0x3c0 do_munmap+0xbd/0x100 mremap_to+0x242/0x450 __do_sys_mremap+0xca2/0x1410 do_syscall_64+0xbf/0x360 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff88804442d500 which belongs to the cache vm_area_struct of size 256 The buggy address is located 88 bytes inside of freed 256-byte region [ffff88804442d500, ffff88804442d600) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x4442d memcg:ffff88801b16af01 flags: 0x100000000000000(node=0|zone=1) page_type: f5(slab) raw: 0100000000000000 ffff888008fffc80 ffffea00011bb140 dead000000000008 raw: 0000000000000000 00000000000c000c 00000000f5000000 ffff88801b16af01 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88804442d400: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88804442d480: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc >ffff88804442d500: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88804442d580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88804442d600: fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00 ================================================================== mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium UDC core: USB Raw Gadget: couldn't find an available UDC or it's busy misc raw-gadget: fail, usb_gadget_register_driver returned -16 mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium UDC core: USB Raw Gadget: couldn't find an available UDC or it's busy misc raw-gadget: fail, usb_gadget_register_driver returned -16 UDC core: USB Raw Gadget: couldn't find an available UDC or it's busy misc raw-gadget: fail, usb_gadget_register_driver returned -16 mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium UDC core: USB Raw Gadget: couldn't find an available UDC or it's busy misc raw-gadget: fail, usb_gadget_register_driver returned -16 mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium UDC core: USB Raw Gadget: couldn't find an available UDC or it's busy misc raw-gadget: fail, usb_gadget_register_driver returned -16 mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium UDC core: USB Raw Gadget: couldn't find an available UDC or it's busy misc raw-gadget: fail, usb_gadget_register_driver returned -16 mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium UDC core: USB Raw Gadget: couldn't find an available UDC or it's busy misc raw-gadget: fail, usb_gadget_register_driver returned -16 mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium UDC core: USB Raw Gadget: couldn't find an available UDC or it's busy mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium misc raw-gadget: fail, usb_gadget_register_driver returned -16 mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium UDC core: USB Raw Gadget: couldn't find an available UDC or it's busy misc raw-gadget: fail, usb_gadget_register_driver returned -16 mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium netlink: 8 bytes leftover after parsing attributes in process `syz-executor.6'. netlink: 8 bytes leftover after parsing attributes in process `syz-executor.6'. audit: type=1400 audit(2000000057.026:67): avc: denied { ingress } for pid=281 comm="syz-executor.2" saddr=127.0.0.1 src=58042 daddr=127.0.0.1 dest=36299 netif=lo scontext=system_u:object_r:bin_t:s0 tcontext=system_u:object_r:netif_t:s0 tclass=netif permissive=1 audit: type=1400 audit(2000000057.027:68): avc: denied { recvfrom } for pid=281 comm="syz-executor.2" saddr=127.0.0.1 src=58042 daddr=127.0.0.1 dest=36299 netif=lo scontext=system_u:object_r:bin_t:s0 tcontext=system_u:object_r:node_t:s0 tclass=node permissive=1 audit: type=1400 audit(2000000057.027:69): avc: denied { recv } for pid=281 comm="syz-executor.2" saddr=127.0.0.1 src=58042 daddr=127.0.0.1 dest=36299 netif=lo scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:bin_t:s0 tclass=peer permissive=1 mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium netlink: 8 bytes leftover after parsing attributes in process `syz-executor.6'. mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium netlink: 8 bytes leftover after parsing attributes in process `syz-executor.6'. mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium mac80211_hwsim hwsim9 wlan1: entered promiscuous mode mac80211_hwsim hwsim9 wlan1: left promiscuous mode mac80211_hwsim hwsim9 wlan1: entered promiscuous mode mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium mac80211_hwsim hwsim9 wlan1: left promiscuous mode mac80211_hwsim hwsim9 wlan1: entered promiscuous mode mac80211_hwsim hwsim9 wlan1: left promiscuous mode mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium iso9660: Unknown parameter 'smackfsfloor' iso9660: Unknown parameter 'smackfsfloor' mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium mac80211_hwsim hwsim9 wlan1: entered promiscuous mode mac80211_hwsim hwsim9 wlan1: left promiscuous mode mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium mac80211_hwsim hwsim9 wlan1: entered promiscuous mode mac80211_hwsim hwsim9 wlan1: left promiscuous mode mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium sr 1:0:0:0: [sr0] tag#0 unaligned transfer I/O error, dev sr0, sector 0 op 0x0:(READ) flags 0x200000 phys_seg 1 prio class 2 mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium sr 1:0:0:0: [sr0] tag#0 unaligned transfer I/O error, dev sr0, sector 0 op 0x0:(READ) flags 0x200000 phys_seg 1 prio class 2 mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium