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KASAN: slab-out-of-bounds Write in try_module_get (2)

Status: upstream: reported on 2026/02/06 18:05
Subsystems: modules
[Documentation on labels]
Reported-by: syzbot+e993e01b15c8eefd9cd4@syzkaller.appspotmail.com
First crash: 102d, last: 16h41m
▶ ▼ Discussions (2)
Title Replies (including bot) Last reply
[PATCH 0/2] media: dvbdev: Prevent a dangling pointer in dvb_minors 2 (2) 2026/02/13 13:44
[syzbot] [modules?] KASAN: slab-out-of-bounds Write in try_module_get (2) 0 (1) 2026/02/06 18:05
▶ ▼ Similar bugs (4)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.1 KASAN: slab-out-of-bounds Write in try_module_get 21 6 13h07m 20d 0/3 upstream: reported on 2026/02/11 05:44
linux-5.15 KASAN: slab-out-of-bounds Write in try_module_get 21 2 11h22m 11h24m 0/3 upstream: reported on 2026/03/02 19:08
android-5-10 KASAN: slab-out-of-bounds Write in try_module_get 21 11 232d 303d 0/2 auto-obsoleted due to no activity on 2025/10/12 05:38
upstream KASAN: slab-out-of-bounds Write in try_module_get modules 21 4 197d 321d 0/29 auto-obsoleted due to no activity on 2025/11/15 19:20

Sample crash report:
==================================================================
BUG: KASAN: slab-out-of-bounds in instrument_atomic_read_write include/linux/instrumented.h:112 [inline]
BUG: KASAN: slab-out-of-bounds in atomic_inc_not_zero include/linux/atomic/atomic-instrumented.h:1536 [inline]
BUG: KASAN: slab-out-of-bounds in try_module_get+0x46/0xc0 kernel/module/main.c:913
Write of size 4 at addr ffff88802be11b08 by task syz.2.10538/10655

CPU: 0 UID: 0 PID: 10655 Comm: syz.2.10538 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0xba/0x230 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
 instrument_atomic_read_write include/linux/instrumented.h:112 [inline]
 atomic_inc_not_zero include/linux/atomic/atomic-instrumented.h:1536 [inline]
 try_module_get+0x46/0xc0 kernel/module/main.c:913
 dvb_device_open+0xef/0x350 drivers/media/dvb-core/dvbdev.c:103
 chrdev_open+0x4cd/0x5e0 fs/char_dev.c:411
 do_dentry_open+0x785/0x14e0 fs/open.c:949
 vfs_open+0x3b/0x340 fs/open.c:1081
 do_open fs/namei.c:4671 [inline]
 path_openat+0x2e08/0x3860 fs/namei.c:4830
 do_file_open+0x23e/0x4a0 fs/namei.c:4859
 do_sys_openat2+0x113/0x200 fs/open.c:1366
 do_sys_open fs/open.c:1372 [inline]
 __do_sys_openat fs/open.c:1388 [inline]
 __se_sys_openat fs/open.c:1383 [inline]
 __x64_sys_openat+0x138/0x170 fs/open.c:1383
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f31bb35cfce
Code: 08 0f 85 a5 a8 ff ff 49 89 fb 48 89 f0 48 89 d7 48 89 ce 4c 89 c2 4d 89 ca 4c 8b 44 24 08 4c 8b 4c 24 10 4c 89 5c 24 08 0f 05 <c3> 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 80 00 00 00 00 48 83 ec 08
RSP: 002b:00007f31b95f5b28 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f31b95f66c0 RCX: 00007f31bb35cfce
RDX: 0000000000000002 RSI: 00007f31b95f5c00 RDI: ffffffffffffff9c
RBP: 00007f31b95f5c00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: cccccccccccccccd
R13: 00007f31bb616218 R14: 00007f31bb616180 R15: 00007f31bb73fa48
 </TASK>

Allocated by task 1:
 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:5358
 kmalloc_noprof include/linux/slab.h:950 [inline]
 kzalloc_noprof include/linux/slab.h:1188 [inline]
 bus_add_driver+0x162/0x670 drivers/base/bus.c:699
 driver_register+0x23a/0x320 drivers/base/driver.c:249
 usb_register_driver+0x1e4/0x390 drivers/usb/core/driver.c:1078
 do_one_initcall+0x250/0x8d0 init/main.c:1382
 do_initcall_level+0x104/0x190 init/main.c:1444
 do_initcalls+0x59/0xa0 init/main.c:1460
 kernel_init_freeable+0x2a6/0x3e0 init/main.c:1692
 kernel_init+0x1d/0x1d0 init/main.c:1582
 ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

The buggy address belongs to the object at ffff88802be11a00
 which belongs to the cache kmalloc-256 of size 256
The buggy address is located 56 bytes to the right of
 allocated 208-byte region [ffff88802be11a00, ffff88802be11ad0)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2be10
head: order:1 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000040 ffff88813fea8b40 dead000000000100 dead000000000122
raw: 0000000000000000 0000000800100010 00000000f5000000 0000000000000000
head: 00fff00000000040 ffff88813fea8b40 dead000000000100 dead000000000122
head: 0000000000000000 0000000800100010 00000000f5000000 0000000000000000
head: 00fff00000000001 ffffea0000af8401 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000002
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 1, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, tgid 1 (swapper/0), ts 17379894821, free_ts 0
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x231/0x280 mm/page_alloc.c:1889
 prep_new_page mm/page_alloc.c:1897 [inline]
 get_page_from_freelist+0x24dc/0x2580 mm/page_alloc.c:3962
 __alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5250
 alloc_slab_page mm/slub.c:3269 [inline]
 allocate_slab+0x77/0x660 mm/slub.c:3458
 new_slab mm/slub.c:3516 [inline]
 refill_objects+0x331/0x3c0 mm/slub.c:7153
 refill_sheaf mm/slub.c:2818 [inline]
 __pcs_replace_empty_main+0x2b9/0x620 mm/slub.c:4592
 alloc_from_pcs mm/slub.c:4695 [inline]
 slab_alloc_node mm/slub.c:4829 [inline]
 __kmalloc_cache_noprof+0x392/0x660 mm/slub.c:5353
 kmalloc_noprof include/linux/slab.h:950 [inline]
 kzalloc_noprof include/linux/slab.h:1188 [inline]
 bus_add_driver+0x162/0x670 drivers/base/bus.c:699
 driver_register+0x23a/0x320 drivers/base/driver.c:249
 usb_register_driver+0x1e4/0x390 drivers/usb/core/driver.c:1078
 do_one_initcall+0x250/0x8d0 init/main.c:1382
 do_initcall_level+0x104/0x190 init/main.c:1444
 do_initcalls+0x59/0xa0 init/main.c:1460
 kernel_init_freeable+0x2a6/0x3e0 init/main.c:1692
 kernel_init+0x1d/0x1d0 init/main.c:1582
 ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
page_owner free stack trace missing

Memory state around the buggy address:
 ffff88802be11a00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88802be11a80: 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc
>ffff88802be11b00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                      ^
 ffff88802be11b80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88802be11c00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================

Crashes (63):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/03/02 02:45 upstream e2bd1b136926 43249bac .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce KASAN: slab-out-of-bounds Write in try_module_get
2026/02/26 20:44 upstream f4d0ec0aa20d ffa54287 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root KASAN: slab-out-of-bounds Write in try_module_get
2026/02/22 01:17 upstream d79526b89571 6e7b5511 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce KASAN: slab-out-of-bounds Write in try_module_get
2026/02/21 14:30 upstream a95f71ad3e2e 6e7b5511 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root KASAN: slab-out-of-bounds Write in try_module_get
2026/02/21 12:41 upstream a95f71ad3e2e 6e7b5511 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root KASAN: slab-out-of-bounds Write in try_module_get
2026/02/19 00:22 upstream 2961f841b025 77d4d919 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce KASAN: slab-out-of-bounds Write in try_module_get
2026/02/17 13:34 upstream 970296997869 e439b951 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root KASAN: slab-out-of-bounds Write in try_module_get
2026/02/16 12:46 upstream 0f2acd3148e0 1e62d198 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce KASAN: slab-out-of-bounds Write in try_module_get
2026/02/12 09:48 upstream c22e26bd0906 76a109e2 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root KASAN: slab-out-of-bounds Write in try_module_get
2026/02/08 16:36 upstream e7aa57247700 4c131dc4 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root KASAN: slab-out-of-bounds Write in try_module_get
2026/02/08 04:51 upstream e7aa57247700 4c131dc4 .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto KASAN: slab-out-of-bounds Write in try_module_get
2025/11/20 20:06 upstream 8e621c9a3375 2cc4c24a .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto KASAN: slab-out-of-bounds Write in try_module_get
2026/02/25 11:01 upstream 7dff99b35460 787dfb7c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 KASAN: slab-out-of-bounds Write in try_module_get
2026/03/02 11:49 upstream 11439c4635ed 43249bac .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream KASAN: slab-out-of-bounds Write in try_module_get
2026/02/27 08:56 upstream 3f4a08e64442 a2f13f71 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream KASAN: slab-out-of-bounds Write in try_module_get
2026/02/26 23:53 upstream 3f4a08e64442 a2f13f71 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream KASAN: slab-out-of-bounds Write in try_module_get
2026/02/24 19:24 upstream 7dff99b35460 96b1aa46 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream KASAN: slab-out-of-bounds Write in try_module_get
2026/02/24 12:26 upstream 7dff99b35460 96b1aa46 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream KASAN: slab-out-of-bounds Write in try_module_get
2026/02/23 20:05 upstream 6de23f81a5e0 7c9658af .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream KASAN: slab-out-of-bounds Write in try_module_get
2026/02/22 21:33 upstream 189f164e573e 6e7b5511 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream KASAN: slab-out-of-bounds Write in try_module_get
2026/02/21 11:54 upstream a95f71ad3e2e 6e7b5511 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream KASAN: slab-out-of-bounds Write in try_module_get
2026/02/20 02:14 upstream 2b7a25df823d 73a252ac .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream KASAN: slab-out-of-bounds Write in try_module_get
2026/02/18 11:42 upstream 2961f841b025 39751c21 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream KASAN: slab-out-of-bounds Write in try_module_get
2026/02/17 16:37 upstream 970296997869 4db8fa92 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream KASAN: slab-out-of-bounds Write in try_module_get
2026/02/16 17:08 upstream 0f2acd3148e0 84656fa6 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream KASAN: slab-out-of-bounds Write in try_module_get
2026/02/15 21:43 upstream 26a4cfaff82a 1e62d198 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream KASAN: slab-out-of-bounds Write in try_module_get
2026/02/14 14:36 upstream 770aaedb461a 1e62d198 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream KASAN: slab-out-of-bounds Write in try_module_get
2026/02/12 14:27 upstream 37a93dd5c49b 76a109e2 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream KASAN: slab-out-of-bounds Write in try_module_get
2026/02/12 07:02 upstream 1e83ccd5921a 76a109e2 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream KASAN: slab-out-of-bounds Write in try_module_get
2026/02/12 02:19 upstream 1e83ccd5921a 76a109e2 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream KASAN: slab-out-of-bounds Write in try_module_get
2026/02/09 20:02 upstream 05f7e89ab973 df949cd9 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream KASAN: slab-out-of-bounds Write in try_module_get
2026/02/09 03:38 upstream e98f34af6116 4c131dc4 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream KASAN: slab-out-of-bounds Write in try_module_get
2026/02/07 08:40 upstream 2687c848e578 f20fc9f9 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream KASAN: slab-out-of-bounds Write in try_module_get
2026/02/06 11:57 upstream b7ff7151e653 97745f52 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream KASAN: slab-out-of-bounds Write in try_module_get
2026/02/22 03:05 upstream d79526b89571 6e7b5511 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 KASAN: slab-out-of-bounds Write in try_module_get
2026/02/07 00:13 upstream 2687c848e578 f20fc9f9 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 KASAN: slab-out-of-bounds Write in try_module_get
2026/02/19 01:03 linux-next 50f68cc7be0a 77d4d919 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce KASAN: slab-out-of-bounds Write in try_module_get
2026/02/18 15:03 linux-next 50f68cc7be0a 77d4d919 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Write in try_module_get
2026/02/06 18:04 linux-next 9845cf73f7db 97745f52 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce KASAN: slab-out-of-bounds Write in try_module_get
2026/03/02 13:51 upstream 11439c4635ed b9dd6534 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root general protection fault in try_module_get
2026/02/15 10:08 upstream ca4ee40bf13d 1e62d198 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce KASAN: global-out-of-bounds Write in try_module_get
2026/02/14 22:20 upstream 770aaedb461a 1e62d198 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in try_module_get
2026/02/11 09:37 upstream dc855b77719f 441e25b7 .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto general protection fault in try_module_get
2026/02/10 18:18 upstream 72c395024dac 91d776d3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in try_module_get
2026/02/07 17:21 upstream 2687c848e578 f20fc9f9 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root general protection fault in try_module_get
2025/12/07 16:57 upstream 37bb2e7217b0 d1b870e1 .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto general protection fault in try_module_get
2026/03/01 16:17 upstream eb71ab2bf722 43249bac .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in try_module_get
2026/02/26 07:24 upstream d9d32e5bd5a4 e0f78d93 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in try_module_get
2026/03/02 00:57 upstream 39c633261414 43249bac .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream general protection fault in try_module_get
2026/03/01 20:25 upstream eb71ab2bf722 43249bac .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream general protection fault in try_module_get
2026/02/25 17:42 upstream 7dff99b35460 c162cde9 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream general protection fault in try_module_get
2026/02/22 16:04 upstream 32a92f8c8932 6e7b5511 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream KASAN: slab-use-after-free Write in try_module_get
2026/02/22 13:59 upstream 32a92f8c8932 6e7b5511 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream general protection fault in try_module_get
2026/02/12 10:11 upstream 1e83ccd5921a 76a109e2 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream KASAN: global-out-of-bounds Write in try_module_get
2026/02/09 16:37 upstream 05f7e89ab973 df949cd9 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream general protection fault in try_module_get
2026/02/08 14:47 upstream e7aa57247700 4c131dc4 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream general protection fault in try_module_get
2026/02/06 11:57 upstream b7ff7151e653 97745f52 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream general protection fault in try_module_get
2026/03/01 18:19 upstream eb71ab2bf722 43249bac .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 general protection fault in try_module_get
2026/02/27 21:30 upstream a75cb869a8cc 2cf092b8 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 general protection fault in try_module_get
2026/02/21 12:47 upstream a95f71ad3e2e 6e7b5511 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 general protection fault in try_module_get
2026/02/12 05:11 upstream 1e83ccd5921a 76a109e2 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 general protection fault in try_module_get
* Struck through repros no longer work on HEAD.