KASAN: slab-use-after-free Read in ax25_send

ID	Workflow	Result	Correct	Bug	Created	Started	Finished	Revision
1683b37c	assessment-security	DenialOfService: ✅ Exploitable: ✅ FilesystemTrigger: ❌ NetworkTrigger: ❌ PeripheralTrigger: ❌ RemoteTrigger: ❌ Unprivileged: ❌ UserNamespace: ❌ VMGuestTrigger: ❌ VMHostTrigger: ❌	❓	KASAN: slab-use-after-free Read in ax25_send_frame (3)	2026/05/25 03:41	2026/05/25 03:41	2026/05/25 04:40	c69befb3

Title	Replies (including bot)	Last reply
[BUG] rose/ax25: use-after-free in rose_transmit_restart_request()	1 (1)	2026/05/13 16:27
[syzbot] [hams?] KASAN: slab-use-after-free Read in ax25_send_frame (3)	1 (2)	2026/04/27 15:25

Title

Replies (including bot)

Last reply

[BUG] rose/ax25: use-after-free in rose_transmit_restart_request()

1 (1)

2026/05/13 16:27

[syzbot] [hams?] KASAN: slab-use-after-free Read in ax25_send_frame (3)

1 (2)

2026/04/27 15:25

Kernel	Title	Rank 🛈	Count	Last	Reported	Patched	Status
upstream	KASAN: slab-use-after-free Read in ax25_send_frame (2) hams	19	7	139d	178d	0/29	closed as invalid on 2026/03/27 01:43
upstream	KASAN: slab-use-after-free Read in ax25_send_frame hams	19	1	293d	293d	0/29	auto-obsoleted due to no activity on 2025/12/31 09:06
upstream	general protection fault in ax25_send_frame (2) hams	10	13	1375d	1362d	22/29	fixed on 2023/02/24 13:50
linux-6.1	KASAN: use-after-free Read in ax25_send_frame	19	1	132d	132d	0/3	auto-obsoleted due to no activity on 2026/07/09 20:24

Rank 🛈

upstream

KASAN: slab-use-after-free Read in ax25_send_frame (2) hams

139d

178d

0/29

closed as invalid on 2026/03/27 01:43

upstream

KASAN: slab-use-after-free Read in ax25_send_frame hams

293d

0/29

auto-obsoleted due to no activity on 2025/12/31 09:06

upstream

general protection fault in ax25_send_frame (2) hams

1375d

1362d

22/29

fixed on 2023/02/24 13:50

linux-6.1

KASAN: use-after-free Read in ax25_send_frame

132d

0/3

auto-obsoleted due to no activity on 2026/07/09 20:24

================================================================== BUG: KASAN: slab-use-after-free in kmemdup_noprof+0x55/0x70 mm/util.c:140 Read of size 66 at addr ffff8880310ac600 by task swapper/0/0 CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 Call Trace: <IRQ> dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 print_address_description+0x55/0x1e0 mm/kasan/report.c:378 print_report+0x58/0x70 mm/kasan/report.c:482 kasan_report+0x117/0x150 mm/kasan/report.c:595 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x264/0x2c0 mm/kasan/generic.c:200 __asan_memcpy+0x29/0x70 mm/kasan/shadow.c:105 kmemdup_noprof+0x55/0x70 mm/util.c:140 kmemdup_noprof include/linux/fortify-string.h:763 [inline] ax25_send_frame+0x693/0x9f0 net/ax25/ax25_out.c:78 rose_send_frame net/rose/rose_link.c:106 [inline] rose_transmit_restart_request net/rose/rose_link.c:198 [inline] rose_t0timer_expiry+0x255/0x560 net/rose/rose_link.c:83 call_timer_fn+0x192/0x5e0 kernel/time/timer.c:1748 expire_timers kernel/time/timer.c:1799 [inline] __run_timers kernel/time/timer.c:2374 [inline] __run_timer_base+0x652/0x8b0 kernel/time/timer.c:2386 run_timer_base kernel/time/timer.c:2395 [inline] run_timer_softirq+0xb7/0x170 kernel/time/timer.c:2405 handle_softirqs+0x22a/0x840 kernel/softirq.c:622 __do_softirq kernel/softirq.c:656 [inline] invoke_softirq kernel/softirq.c:496 [inline] __irq_exit_rcu+0xca/0x220 kernel/softirq.c:735 irq_exit_rcu+0x9/0x30 kernel/softirq.c:752 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1061 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1061 </IRQ> <TASK> asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:63 Code: db 70 02 e9 53 f4 02 00 cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d 13 81 10 00 fb f4 <c3> cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90 RSP: 0018:ffffffff8e607dc0 EFLAGS: 00000242 RAX: 0000000000110dc7 RBX: ffffffff819aae9a RCX: 0000000080000001 RDX: 0000000000000001 RSI: ffffffff8dfd8f45 RDI: ffffffff8c289f60 RBP: ffffffff8e607eb0 R08: ffff8880b86339db R09: 1ffff110170c673b R10: dffffc0000000000 R11: ffffed10170c673c R12: 0000000000000000 R13: 1ffffffff1cd25d8 R14: 0000000000000000 R15: 1ffffffff1cd25d8 arch_safe_halt arch/x86/kernel/process.c:766 [inline] default_idle+0x9/0x20 arch/x86/kernel/process.c:767 default_idle_call+0x72/0xb0 kernel/sched/idle.c:122 cpuidle_idle_call kernel/sched/idle.c:199 [inline] do_idle+0x36a/0x5f0 kernel/sched/idle.c:352 cpu_startup_entry+0x43/0x60 kernel/sched/idle.c:451 rest_init+0x2de/0x300 init/main.c:762 start_kernel+0x38a/0x3e0 init/main.c:1220 x86_64_start_reservations+0x24/0x30 arch/x86/kernel/head64.c:310 x86_64_start_kernel+0x143/0x1c0 arch/x86/kernel/head64.c:291 common_startup_64+0x13e/0x147 </TASK> Allocated by task 10474: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 poison_kmalloc_redzone mm/kasan/common.c:398 [inline] __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:415 kasan_kmalloc include/linux/kasan.h:263 [inline] __kmalloc_cache_noprof+0x31c/0x660 mm/slub.c:5415 kmalloc_noprof include/linux/slab.h:950 [inline] rose_add_node+0x471/0xf00 net/rose/rose_route.c:109 rose_rt_ioctl+0xd35/0x12a0 net/rose/rose_route.c:748 rose_ioctl+0x3fb/0x8f0 net/rose/af_rose.c:1387 sock_do_ioctl+0x101/0x320 net/socket.c:1313 sock_ioctl+0x5c6/0x7f0 net/socket.c:1434 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 0: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:584 poison_slab_object mm/kasan/common.c:253 [inline] __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:285 kasan_slab_free include/linux/kasan.h:235 [inline] slab_free_hook mm/slub.c:2689 [inline] slab_free mm/slub.c:6246 [inline] kfree+0x1c5/0x640 mm/slub.c:6561 rose_neigh_put include/net/rose.h:165 [inline] rose_timer_expiry+0x4c3/0x600 net/rose/rose_timer.c:183 call_timer_fn+0x192/0x5e0 kernel/time/timer.c:1748 expire_timers kernel/time/timer.c:1799 [inline] __run_timers kernel/time/timer.c:2374 [inline] __run_timer_base+0x652/0x8b0 kernel/time/timer.c:2386 run_timer_base kernel/time/timer.c:2395 [inline] run_timer_softirq+0xb7/0x170 kernel/time/timer.c:2405 handle_softirqs+0x22a/0x840 kernel/softirq.c:622 __do_softirq kernel/softirq.c:656 [inline] invoke_softirq kernel/softirq.c:496 [inline] __irq_exit_rcu+0xca/0x220 kernel/softirq.c:735 irq_exit_rcu+0x9/0x30 kernel/softirq.c:752 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1061 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1061 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 The buggy address belongs to the object at ffff8880310ac600 which belongs to the cache kmalloc-96 of size 96 The buggy address is located 0 bytes inside of freed 96-byte region [ffff8880310ac600, ffff8880310ac660) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x310ac flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000000 ffff88813fe2e280 dead000000000100 dead000000000122 raw: 0000000000000000 0000000800200020 00000000f5000000 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0xd2cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, tgid 1 (swapper/0), ts 22916083211, free_ts 22905974702 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x231/0x280 mm/page_alloc.c:1858 prep_new_page mm/page_alloc.c:1866 [inline] get_page_from_freelist+0x24ba/0x2540 mm/page_alloc.c:3946 __alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5226 alloc_slab_page mm/slub.c:3278 [inline] allocate_slab+0x77/0x660 mm/slub.c:3467 new_slab mm/slub.c:3525 [inline] refill_objects+0x339/0x3d0 mm/slub.c:7251 refill_sheaf mm/slub.c:2816 [inline] __pcs_replace_empty_main+0x321/0x720 mm/slub.c:4651 alloc_from_pcs mm/slub.c:4749 [inline] slab_alloc_node mm/slub.c:4883 [inline] __kmalloc_cache_noprof+0x392/0x660 mm/slub.c:5410 kmalloc_noprof include/linux/slab.h:950 [inline] kzalloc_noprof include/linux/slab.h:1188 [inline] lookup_or_create_module_kobject+0x75/0x170 kernel/params.c:759 module_add_driver+0x79/0x320 drivers/base/module.c:46 bus_add_driver+0x391/0x670 drivers/base/bus.c:760 driver_register+0x23a/0x320 drivers/base/driver.c:249 usb_register_driver+0x1e4/0x390 drivers/usb/core/driver.c:1078 do_one_initcall+0x250/0x870 init/main.c:1392 do_initcall_level+0x104/0x190 init/main.c:1454 do_initcalls+0x59/0xa0 init/main.c:1470 kernel_init_freeable+0x2a6/0x3e0 init/main.c:1703 page last free pid 1 tgid 1 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] __free_pages_prepare mm/page_alloc.c:1402 [inline] __free_frozen_pages+0xbc7/0xd30 mm/page_alloc.c:2943 vfree+0x1d1/0x2f0 mm/vmalloc.c:3472 tpg_free+0x3aa/0x430 drivers/media/common/v4l2-tpg/v4l2-tpg-core.c:202 vivid_dev_release+0xc5/0x120 drivers/media/test-drivers/vivid/vivid-core.c:865 v4l2_device_release drivers/media/v4l2-core/v4l2-device.c:51 [inline] kref_put include/linux/kref.h:65 [inline] v4l2_device_put+0x81/0xd0 drivers/media/v4l2-core/v4l2-device.c:56 vivid_create_instance drivers/media/test-drivers/vivid/vivid-core.c:2070 [inline] vivid_probe+0x4a4a/0x72b0 drivers/media/test-drivers/vivid/vivid-core.c:2095 platform_probe+0xf9/0x190 drivers/base/platform.c:1418 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x267/0xaf0 drivers/base/dd.c:709 __driver_probe_device+0x1ef/0x380 drivers/base/dd.c:871 driver_probe_device+0x4f/0x240 drivers/base/dd.c:901 __driver_attach+0x34c/0x640 drivers/base/dd.c:1295 bus_for_each_dev+0x23b/0x2c0 drivers/base/bus.c:383 bus_add_driver+0x345/0x670 drivers/base/bus.c:756 driver_register+0x23a/0x320 drivers/base/driver.c:249 vivid_init+0x561/0x5f0 drivers/media/test-drivers/vivid/vivid-core.c:2294 do_one_initcall+0x250/0x870 init/main.c:1392 Memory state around the buggy address: ffff8880310ac500: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc ffff8880310ac580: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc >ffff8880310ac600: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ^ ffff8880310ac680: 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc ffff8880310ac700: 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc ================================================================== ---------------- Code disassembly (best guess): 0: db 70 02 (bad) 0x2(%rax) 3: e9 53 f4 02 00 jmp 0x2f45b 8: cc int3 9: cc int3 a: cc int3 b: 90 nop c: 90 nop d: 90 nop e: 90 nop f: 90 nop 10: 90 nop 11: 90 nop 12: 90 nop 13: 90 nop 14: 90 nop 15: 90 nop 16: 90 nop 17: 90 nop 18: 90 nop 19: 90 nop 1a: 90 nop 1b: f3 0f 1e fa endbr64 1f: 66 90 xchg %ax,%ax 21: 0f 00 2d 13 81 10 00 verw 0x108113(%rip) # 0x10813b 28: fb sti 29: f4 hlt * 2a: c3 ret <-- trapping instruction 2b: cc int3 2c: cc int3 2d: cc int3 2e: cc int3 2f: cc int3 30: cc int3 31: cc int3 32: cc int3 33: cc int3 34: cc int3 35: cc int3 36: cc int3 37: cc int3 38: cc int3 39: cc int3 3a: cc int3 3b: 90 nop 3c: 90 nop 3d: 90 nop 3e: 90 nop 3f: 90 nop

Crashes (2):
Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Assets (help?)	Manager	Title
2026/04/26 20:11	net-next	e728258debd5	9c2d0995	.config	console log	report			info	[disk image] [vmlinux] [kernel image]	ci-upstream-net-kasan-gce	KASAN: slab-use-after-free Read in ax25_send_frame
2026/04/26 07:55	net-next	e728258debd5	9c2d0995	.config	console log	report			info	[disk image] [vmlinux] [kernel image]	ci-upstream-net-kasan-gce	KASAN: slab-use-after-free Read in ax25_send_frame

Crashes (2):

Assets (help?)