CVE-2023-53138

HIGH EPSS 4.8%
Published May 2, 20251y ago · Modified Jun 17, 20261w ago
7.8 CVSS 3.1
High
Find Similar
Published May 2, 2025 1y ago
Last Modified Jun 17, 2026 1w ago

Description

In the Linux kernel, the following vulnerability has been resolved: net: caif: Fix use-after-free in cfusbl_device_notify() syzbot reported use-after-free in cfusbl_device_notify() [1]. This causes a stack trace like below: BUG: KASAN: use-after-free in cfusbl_device_notify+0x7c9/0x870 net/caif/caif_usb.c:138 Read of size 8 at addr ffff88807ac4e6f0 by task kworker/u4:6/1214 CPU: 0 PID: 1214 Comm: kworker/u4:6 Not tainted 5.19.0-rc3-syzkaller-00146-g92f20ff72066 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: netns cleanup_net Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 print_address_description.constprop.0.cold+0xeb/0x467 mm/kasan/report.c:313 print_report mm/kasan/report.c:429 [inline] kasan_report.cold+0xf4/0x1c6 mm/kasan/report.c:491 cfusbl_device_notify+0x7c9/0x870 net/caif/caif_usb.c:138 notifier_call_chain+0xb5/0x200 kernel/notifier.c:87 call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:1945 call_netdevice_notifiers_extack net/core/dev.c:1983 [inline] call_netdevice_notifiers net/core/dev.c:1997 [inline] netdev_wait_allrefs_any net/core/dev.c:10227 [inline] netdev_run_todo+0xbc0/0x10f0 net/core/dev.c:10341 default_device_exit_batch+0x44e/0x590 net/core/dev.c:11334 ops_exit_list+0x125/0x170 net/core/net_namespace.c:167 cleanup_net+0x4ea/0xb00 net/core/net_namespace.c:594 process_one_work+0x996/0x1610 kernel/workqueue.c:2289 worker_thread+0x665/0x1080 kernel/workqueue.c:2436 kthread+0x2e9/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:302 </TASK> When unregistering a net device, unregister_netdevice_many_notify() sets the device's reg_state to NETREG_UNREGISTERING, calls notifiers with NETDEV_UNREGISTER, and adds the device to the todo list. Later on, devices in the todo list are processed by netdev_run_todo(). netdev_run_todo() waits devices' reference count become 1 while rebdoadcasting NETDEV_UNREGISTER notification. When cfusbl_device_notify() is called with NETDEV_UNREGISTER multiple times, the parent device might be freed. This could cause UAF. Processing NETDEV_UNREGISTER multiple times also causes inbalance of reference count for the module. This patch fixes the issue by accepting only first NETDEV_UNREGISTER notification.

CVSS Details

Base Score
7.8
Exploitability
1.8
Impact
5.9
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality High
Integrity High
Availability High

Threat Intelligence

EPSS Exploit Probability
4.8% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-416 Use After Free Memory Safety

Affected Products 8

VendorProductVersionRange
linuxlinux_kernel*≥3.3  –  <4.14.310
linuxlinux_kernel*≥4.15  –  <4.19.278
linuxlinux_kernel*≥4.20  –  <5.4.237
linuxlinux_kernel*≥5.5  –  <5.10.175
linuxlinux_kernel*≥5.11  –  <5.15.103
linuxlinux_kernel*≥5.16  –  <6.1.20
linuxlinux_kernel*≥6.2  –  <6.2.7
linuxlinux_kernel6.3any

References 8

  • git.kernel.org https://git.kernel.org/stable/c/1793da97a23e31c5bf06631f3f3e5a25f368fd64
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/287027d8a567168a5d8ce5cb0cba16a34791a48c
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/3f14457e1584224f4296af613bbd99deb60b5d91
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/68a45c3cf0e2242a533657f4f535d9b6a7447a79
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/9781e98a97110f5e76999058368b4be76a788484
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/9dc16be373b382ddd4c274052a6e870a95e76c01
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/c3aaec463a632cf4187dc017e421bfa69d7834a9
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/d1a11bbdbb5ea9f172019c5a4a3e9d8eabd72179
    Patch

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/1793da97a23e31c5bf06631f3f3e5a25f368fd64
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/287027d8a567168a5d8ce5cb0cba16a34791a48c
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/3f14457e1584224f4296af613bbd99deb60b5d91
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/68a45c3cf0e2242a533657f4f535d9b6a7447a79
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/9781e98a97110f5e76999058368b4be76a788484
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/9dc16be373b382ddd4c274052a6e870a95e76c01
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/c3aaec463a632cf4187dc017e421bfa69d7834a9
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/d1a11bbdbb5ea9f172019c5a4a3e9d8eabd72179
    Patch