CVE-2025-38473

MEDIUM EPSS 5.2%
Published Jul 28, 202511mo ago · Modified Jun 17, 20261w ago
5.5 CVSS 3.1
Medium
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Published Jul 28, 2025 11mo ago
Last Modified Jun 17, 2026 1w ago

Description

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: Fix null-ptr-deref in l2cap_sock_resume_cb() syzbot reported null-ptr-deref in l2cap_sock_resume_cb(). [0] l2cap_sock_resume_cb() has a similar problem that was fixed by commit 1bff51ea59a9 ("Bluetooth: fix use-after-free error in lock_sock_nested()"). Since both l2cap_sock_kill() and l2cap_sock_resume_cb() are executed under l2cap_sock_resume_cb(), we can avoid the issue simply by checking if chan->data is NULL. Let's not access to the killed socket in l2cap_sock_resume_cb(). [0]: BUG: KASAN: null-ptr-deref in instrument_atomic_write include/linux/instrumented.h:82 [inline] BUG: KASAN: null-ptr-deref in clear_bit include/asm-generic/bitops/instrumented-atomic.h:41 [inline] BUG: KASAN: null-ptr-deref in l2cap_sock_resume_cb+0xb4/0x17c net/bluetooth/l2cap_sock.c:1711 Write of size 8 at addr 0000000000000570 by task kworker/u9:0/52 CPU: 1 UID: 0 PID: 52 Comm: kworker/u9:0 Not tainted 6.16.0-rc4-syzkaller-g7482bb149b9f #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Workqueue: hci0 hci_rx_work Call trace: show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:501 (C) __dump_stack+0x30/0x40 lib/dump_stack.c:94 dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120 print_report+0x58/0x84 mm/kasan/report.c:524 kasan_report+0xb0/0x110 mm/kasan/report.c:634 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x264/0x2a4 mm/kasan/generic.c:189 __kasan_check_write+0x20/0x30 mm/kasan/shadow.c:37 instrument_atomic_write include/linux/instrumented.h:82 [inline] clear_bit include/asm-generic/bitops/instrumented-atomic.h:41 [inline] l2cap_sock_resume_cb+0xb4/0x17c net/bluetooth/l2cap_sock.c:1711 l2cap_security_cfm+0x524/0xea0 net/bluetooth/l2cap_core.c:7357 hci_auth_cfm include/net/bluetooth/hci_core.h:2092 [inline] hci_auth_complete_evt+0x2e8/0xa4c net/bluetooth/hci_event.c:3514 hci_event_func net/bluetooth/hci_event.c:7511 [inline] hci_event_packet+0x650/0xe9c net/bluetooth/hci_event.c:7565 hci_rx_work+0x320/0xb18 net/bluetooth/hci_core.c:4070 process_one_work+0x7e8/0x155c kernel/workqueue.c:3238 process_scheduled_works kernel/workqueue.c:3321 [inline] worker_thread+0x958/0xed8 kernel/workqueue.c:3402 kthread+0x5fc/0x75c kernel/kthread.c:464 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:847

CVSS Details

Base Score
5.5
Exploitability
1.8
Impact
3.6
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
5.2% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-476 NULL Pointer Dereference Memory Safety

Affected Products 14

VendorProductVersionRange
linuxlinux_kernel*≥3.13  –  <5.4.297
linuxlinux_kernel*≥5.5  –  <5.10.241
linuxlinux_kernel*≥5.11  –  <5.15.190
linuxlinux_kernel*≥5.16  –  <6.1.147
linuxlinux_kernel*≥6.2  –  <6.6.100
linuxlinux_kernel*≥6.7  –  <6.12.40
linuxlinux_kernel*≥6.13  –  <6.15.8
linuxlinux_kernel6.16any
linuxlinux_kernel6.16any
linuxlinux_kernel6.16any
linuxlinux_kernel6.16any
linuxlinux_kernel6.16any
linuxlinux_kernel6.16any
debiandebian_linux11.0any

References 10

  • git.kernel.org https://git.kernel.org/stable/c/262cd18f5f7ede6a586580cadc5d0799e52e2e7c
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/2b27b389006623673e8cfff4ce1e119cce640b05
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/3a4eca2a1859955c65f07a570156bd2d9048ce33
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/6d63901dcd592a1e3f71d7c6d78f9be5e8d7eef0
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/a0075accbf0d76c2dad1ad3993d2e944505d99a0
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/ac3a8147bb24314fb3e84986590148e79f9872ec
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/b97be7ee8a1cd96b89817cbd64a9f5cc16c17d08
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/c4f16f6b071a74ac7eefe5c28985285cbbe2cd96
    Patch
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html
    Mailing ListThird Party Advisory
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html
    Mailing ListThird Party Advisory

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/262cd18f5f7ede6a586580cadc5d0799e52e2e7c
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/2b27b389006623673e8cfff4ce1e119cce640b05
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/3a4eca2a1859955c65f07a570156bd2d9048ce33
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/6d63901dcd592a1e3f71d7c6d78f9be5e8d7eef0
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/a0075accbf0d76c2dad1ad3993d2e944505d99a0
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/ac3a8147bb24314fb3e84986590148e79f9872ec
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/b97be7ee8a1cd96b89817cbd64a9f5cc16c17d08
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/c4f16f6b071a74ac7eefe5c28985285cbbe2cd96
    Patch