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CVE-2023-53138— net: caif: Fix use-after-free in cfusbl_device_notify()

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于cfusbl_device_notify函数存在释放后重用问题。

CVSS 7.8 · High EPSS 0.18% · P8

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 7ad65bf68d705b445ef10b77ab50dab22be185ee< 68a45c3cf0e2242a533657f4f535d9b6a7447a79 affected
7ad65bf68d705b445ef10b77ab50dab22be185ee< 1793da97a23e31c5bf06631f3f3e5a25f368fd64 affected
7ad65bf68d705b445ef10b77ab50dab22be185ee< 9dc16be373b382ddd4c274052a6e870a95e76c01 affected
7ad65bf68d705b445ef10b77ab50dab22be185ee< c3aaec463a632cf4187dc017e421bfa69d7834a9 affected
7ad65bf68d705b445ef10b77ab50dab22be185ee< 3f14457e1584224f4296af613bbd99deb60b5d91 affected
7ad65bf68d705b445ef10b77ab50dab22be185ee< 287027d8a567168a5d8ce5cb0cba16a34791a48c affected
7ad65bf68d705b445ef10b77ab50dab22be185ee< d1a11bbdbb5ea9f172019c5a4a3e9d8eabd72179 affected
7ad65bf68d705b445ef10b77ab50dab22be185ee< 9781e98a97110f5e76999058368b4be76a788484 affected
… +10 more rows
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I. Basic Information for CVE-2023-53138

Vulnerability Information
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Vulnerability Title
net: caif: Fix use-after-free in cfusbl_device_notify()
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于cfusbl_device_notify函数存在释放后重用问题。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 7ad65bf68d705b445ef10b77ab50dab22be185ee ~ 68a45c3cf0e2242a533657f4f535d9b6a7447a79 -
Linux Linux 3.3 -

II. Public POCs for CVE-2023-53138

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III. Intelligence Information for CVE-2023-53138

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Patches & Fixes for CVE-2023-53138 (8)

Same Patch Batch · Linux · 2025-05-02 · 107 CVEs total

CVE-2023-53116 9.8 CRITICAL nvmet: avoid potential UAF in nvmet_req_complete()
CVE-2023-53083 9.8 CRITICAL nfsd: don't replace page in rq_pages if it's a continuation of last page
CVE-2023-53086 8.8 HIGH wifi: mt76: connac: do not check WED status for non-mmio devices
CVE-2025-37798 7.8 HIGH codel: remove sch->q.qlen check before qdisc_tree_reduce_backlog()
CVE-2023-53111 7.8 HIGH loop: Fix use-after-free issues
CVE-2023-53107 7.8 HIGH veth: Fix use after free in XDP_REDIRECT
CVE-2023-53102 7.8 HIGH ice: xsk: disable txq irq before flushing hw
CVE-2023-53100 7.8 HIGH ext4: fix WARNING in ext4_update_inline_data
CVE-2023-53094 7.8 HIGH tty: serial: fsl_lpuart: fix race on RX DMA shutdown
CVE-2023-53090 7.8 HIGH drm/amdkfd: Fix an illegal memory access
CVE-2023-53088 7.8 HIGH mptcp: fix UaF in listener shutdown
CVE-2023-53087 7.8 HIGH drm/i915/active: Fix misuse of non-idle barriers as fence trackers
CVE-2023-53084 7.8 HIGH drm/shmem-helper: Remove another errant put in error path
CVE-2023-53080 7.8 HIGH xsk: Add missing overflow check in xdp_umem_reg
CVE-2023-53072 7.8 HIGH mptcp: use the workqueue to destroy unaccepted sockets
CVE-2023-53065 7.8 HIGH perf/core: Fix perf_output_begin parameter is incorrectly invoked in perf_event_bpf_output
CVE-2023-53057 7.8 HIGH Bluetooth: HCI: Fix global-out-of-bounds
CVE-2023-53052 7.8 HIGH cifs: fix use-after-free bug in refresh_cache_worker()
CVE-2023-53043 7.8 HIGH arm64: dts: qcom: sc7280: Mark PCIe controller as cache coherent
CVE-2023-53039 7.8 HIGH HID: intel-ish-hid: ipc: Fix potential use-after-free in work function

Showing top 20 of 107 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2023-53138

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