CVE-2026-98776UNKNOWNMITRENVD대응게시일: 2026. 10. 18.수정일: 2026. 10. 19.CNA: 416baaa9-dc9f-4396-8d5f-8c081fb06d67Received

In the Linux kernel, the following vulnerability has been resolved: binderfs: fix UAF write in binder_add_device binderfs_binder_device_cr

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CVSS

—unknown

이론적 심각도 점수

EPSS

—

예측 데이터 없음

KEV

미등재

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권장 대응 기한60일 이내CISA SSVC 기준

계획된 패치 주기 내 조치(60일 이내)

외부 노출· KEV 미등재 · 자동화 어려움 · 부분 영향 · 외부 노출

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상세 설명

In the Linux kernel, the following vulnerability has been resolved:

binderfs: fix UAF write in binder_add_device

binderfs_binder_device_create() publishes the new dentry with
d_make_persistent() and then calls simple_done_creating(), which drops
the parent directory lock and the creator's dentry reference. It then
calls binder_add_device() to register the device in the global
binder_devices list.

After simple_done_creating() releases the parent directory lock, a
concurrent unlinkat() can remove the new device entry. Dropping the
creator's dentry reference can then trigger binderfs_evict_inode(),
freeing the device. binder_add_device() later accesses the freed
object, causing UAF write.

Found by a modified Syzkaller:

bash

 1BUG: KASAN: slab-use-after-free in hlist_add_head include/linux/list.h:1073 [inline]
 2BUG: KASAN: slab-use-after-free in binder_add_device+0xa9/0xc0 drivers/android/binder.c:7068
 3Write of size 8 at addr ffff88805b340c00 by task syz.1.532/11389
 4 
 5CPU: 0 UID: 0 PID: 11389 Comm: syz.1.532 Not tainted 7.2.0 #4 PREEMPT(full)
 6Hardware name: QEMU Ubuntu 24.04 PC v2 (i440FX + PIIX, arch_caps fix, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
 7Call Trace:
 8<TASK>
 9__dump_stack lib/dump_stack.c:94 [inline]
10dump_stack_lvl+0x10e/0x1f0 lib/dump_stack.c:120
11print_address_description mm/kasan/report.c:378 [inline]
12print_report+0xf7/0x600 mm/kasan/report.c:482
13kasan_report+0xe4/0x120 mm/kasan/report.c:595
14hlist_add_head include/linux/list.h:1073 [inline]
15binder_add_device+0xa9/0xc0 drivers/android/binder.c:7068
16binderfs_binder_device_create.isra.0+0x724/0x990 drivers/android/binderfs.c:196
17binder_ctl_ioctl+0x186/0x1b0 drivers/android/binderfs.c:241
18vfs_ioctl fs/ioctl.c:51 [inline]
19__do_sys_ioctl fs/ioctl.c:597 [inline]
20__se_sys_ioctl fs/ioctl.c:583 [inline]
21__x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:583
22do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
23do_syscall_64+0x116/0x800 arch/x86/entry/syscall_64.c:94
24entry_SYSCALL_64_after_hwframe+0x77/0x7f
25RIP: 0033:0x7ff9027a833d
26Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 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 b0 ff ff ff f7 d8 64 89 01 48
27RSP: 002b:00007ff903674018 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
28RAX: ffffffffffffffda RBX: 00007ff902a35fa0 RCX: 00007ff9027a833d
29RDX: 0000200000000500 RSI: 00000000c1086201 RDI: 0000000000000004
30RBP: 00007ff902850733 R08: 0000000000000000 R09: 0000000000000000
31R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
32R13: 00007ff902a36038 R14: 00007ff902a35fa0 R15: 00007ffd7166bfa0
33</TASK>
34 
35Allocated by task 11389:
36kasan_save_stack+0x33/0x60 mm/kasan/common.c:57
37kasan_save_track+0x14/0x30 mm/kasan/common.c:78
38poison_kmalloc_redzone mm/kasan/common.c:398 [inline]
39__kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:415
40kasan_kmalloc include/linux/kasan.h:263 [inline]
41__kmalloc_cache_noprof+0x2e4/0x6f0 mm/slub.c:5489
42_kmalloc_noprof include/linux/slab.h:988 [inline]
43_kzalloc_noprof include/linux/slab.h:1309 [inline]
44binderfs_binder_device_create.isra.0+0x17a/0x990 drivers/android/binderfs.c:148
45binder_ctl_ioctl+0x186/0x1b0 drivers/android/binderfs.c:241
46vfs_ioctl fs/ioctl.c:51 [inline]
47__do_sys_ioctl fs/ioctl.c:597 [inline]
48__se_sys_ioctl fs/ioctl.c:583 [inline]
49__x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:583
50do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
51do_syscall_64+0x116/0x800 arch/x86/entry/syscall_64.c:94
52entry_SYSCALL_64_after_hwframe+0x77/0x7f
53 
54Freed by task 11389:
55kasan_save_stack+0x33/0x60 mm/kasan/common.c:57
56kasan_save_track+0x14/0x30 mm/kasan/common.c:78
57kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:584
58poison_slab_object mm/kasan/common.c:253 [inline]
59__kasan_slab_free+0x5f/0x80 mm/kasan/common.c:285
60kasan_slab_free include/linux/kasan.h:235 [inline]
61slab_free_hook mm/slub.c:2677 [inline]
62slab_free mm/slub.c:6377 [inline]
63kfree+0x2fc/0x6e0 mm/slub.c:6692
64binderf

---truncated---

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