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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: 98d, last: 10h30m
▶ ▼ 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 (3)
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 4 1d08h 16d 0/3 upstream: reported on 2026/02/11 05:44
android-5-10 KASAN: slab-out-of-bounds Write in try_module_get 21 11 228d 300d 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 194d 318d 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+0x4c/0xd0 kernel/module/main.c:913
Write of size 4 at addr ffff88802acc8d08 by task syz.2.6471/29705

CPU: 1 UID: 0 PID: 29705 Comm: syz.2.6471 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 lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0x156/0x4c9 mm/kasan/report.c:482
 kasan_report+0xdf/0x1e0 mm/kasan/report.c:595
 check_region_inline mm/kasan/generic.c:186 [inline]
 kasan_check_range+0x10f/0x1e0 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+0x4c/0xd0 kernel/module/main.c:913
 dvb_device_open+0x124/0x3b0 drivers/media/dvb-core/dvbdev.c:103
 chrdev_open+0x234/0x6a0 fs/char_dev.c:411
 do_dentry_open+0x6d8/0x1660 fs/open.c:949
 vfs_open+0x82/0x3f0 fs/open.c:1081
 do_open fs/namei.c:4671 [inline]
 path_openat+0x208c/0x31a0 fs/namei.c:4830
 do_file_open+0x20e/0x430 fs/namei.c:4859
 do_sys_openat2+0x10d/0x1e0 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+0x12d/0x210 fs/open.c:1383
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x106/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f596655cfce
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:00007f59674fdb28 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f59674fe6c0 RCX: 00007f596655cfce
RDX: 0000000000040002 RSI: 00007f59674fdc00 RDI: ffffffffffffff9c
RBP: 00007f59674fdc00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: cccccccccccccccd
R13: 00007f5966816128 R14: 00007f5966816090 R15: 00007fff871c45c8
 </TASK>

Allocated by task 26:
 kasan_save_stack+0x30/0x50 mm/kasan/common.c:57
 kasan_save_track+0x14/0x30 mm/kasan/common.c:78
 poison_kmalloc_redzone mm/kasan/common.c:398 [inline]
 __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:415
 kasan_kmalloc include/linux/kasan.h:263 [inline]
 __do_kmalloc_node mm/slub.c:5219 [inline]
 __kmalloc_noprof+0x301/0x850 mm/slub.c:5231
 kmalloc_noprof include/linux/slab.h:966 [inline]
 kmalloc_array_noprof include/linux/slab.h:1109 [inline]
 security_inode_init_security+0x113/0x370 security/security.c:1321
 shmem_mknod+0x2bf/0x470 mm/shmem.c:3892
 vfs_mknod+0x3a5/0x7f0 fs/namei.c:5092
 handle_create drivers/base/devtmpfs.c:232 [inline]
 handle drivers/base/devtmpfs.c:384 [inline]
 devtmpfs_work_loop+0x48d/0xae4 drivers/base/devtmpfs.c:399
 devtmpfsd+0x3f/0x50 drivers/base/devtmpfs.c:441
 kthread+0x370/0x450 kernel/kthread.c:467
 ret_from_fork+0x754/0xd80 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

Freed by task 26:
 kasan_save_stack+0x30/0x50 mm/kasan/common.c:57
 kasan_save_track+0x14/0x30 mm/kasan/common.c:78
 kasan_save_free_info+0x3b/0x70 mm/kasan/generic.c:584
 poison_slab_object mm/kasan/common.c:253 [inline]
 __kasan_slab_free+0x5f/0x80 mm/kasan/common.c:285
 kasan_slab_free include/linux/kasan.h:235 [inline]
 slab_free_hook mm/slub.c:2687 [inline]
 slab_free mm/slub.c:6124 [inline]
 kfree+0x1f6/0x6b0 mm/slub.c:6442
 security_inode_init_security+0x2bf/0x370 security/security.c:1348
 shmem_mknod+0x2bf/0x470 mm/shmem.c:3892
 vfs_mknod+0x3a5/0x7f0 fs/namei.c:5092
 handle_create drivers/base/devtmpfs.c:232 [inline]
 handle drivers/base/devtmpfs.c:384 [inline]
 devtmpfs_work_loop+0x48d/0xae4 drivers/base/devtmpfs.c:399
 devtmpfsd+0x3f/0x50 drivers/base/devtmpfs.c:441
 kthread+0x370/0x450 kernel/kthread.c:467
 ret_from_fork+0x754/0xd80 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 ffff88802acc8c00
 which belongs to the cache kmalloc-256 of size 256
The buggy address is located 8 bytes to the right of
 allocated 256-byte region [ffff88802acc8c00, ffff88802acc8d00)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff88802acc8a00 pfn:0x2acc8
head: order:1 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000240(workingset|head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000240 ffff88813fe3ab40 ffffea0000c58990 ffffea0000e00510
raw: ffff88802acc8a00 000000000010000b 00000000f5000000 0000000000000000
head: 00fff00000000240 ffff88813fe3ab40 ffffea0000c58990 ffffea0000e00510
head: ffff88802acc8a00 000000000010000b 00000000f5000000 0000000000000000
head: 00fff00000000001 ffffea0000ab3201 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 0xd2040(__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 26, tgid 26 (kdevtmpfs), ts 7540994664, free_ts 0
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x153/0x170 mm/page_alloc.c:1889
 prep_new_page mm/page_alloc.c:1897 [inline]
 get_page_from_freelist+0x111d/0x3140 mm/page_alloc.c:3962
 __alloc_frozen_pages_noprof+0x27c/0x2ba0 mm/page_alloc.c:5250
 alloc_slab_page mm/slub.c:3255 [inline]
 allocate_slab mm/slub.c:3444 [inline]
 new_slab+0xa6/0x6d0 mm/slub.c:3502
 refill_objects+0x26b/0x400 mm/slub.c:7134
 refill_sheaf mm/slub.c:2804 [inline]
 alloc_full_sheaf mm/slub.c:2825 [inline]
 __pcs_replace_empty_main+0x19f/0x600 mm/slub.c:4588
 alloc_from_pcs mm/slub.c:4681 [inline]
 slab_alloc_node mm/slub.c:4815 [inline]
 __do_kmalloc_node mm/slub.c:5218 [inline]
 __kmalloc_noprof+0x688/0x850 mm/slub.c:5231
 kmalloc_noprof include/linux/slab.h:966 [inline]
 kmalloc_array_noprof include/linux/slab.h:1109 [inline]
 security_inode_init_security+0x113/0x370 security/security.c:1321
 shmem_mknod+0x2bf/0x470 mm/shmem.c:3892
 shmem_mkdir+0x31/0x80 mm/shmem.c:3947
 vfs_mkdir+0x361/0x850 fs/namei.c:5233
 dev_mkdir drivers/base/devtmpfs.c:182 [inline]
 create_path drivers/base/devtmpfs.c:207 [inline]
 handle_create drivers/base/devtmpfs.c:226 [inline]
 handle drivers/base/devtmpfs.c:384 [inline]
 devtmpfs_work_loop+0x2e3/0xae4 drivers/base/devtmpfs.c:399
 devtmpfsd+0x3f/0x50 drivers/base/devtmpfs.c:441
 kthread+0x370/0x450 kernel/kthread.c:467
 ret_from_fork+0x754/0xd80 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
page_owner free stack trace missing

Memory state around the buggy address:
 ffff88802acc8c00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88802acc8c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88802acc8d00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                      ^
 ffff88802acc8d80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88802acc8e00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================

Crashes (54):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
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
2026/02/27 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
2026/02/15 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
2026/02/26 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
2026/02/25 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
2026/02/21 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.