CVE-2023-53138

HIGHNVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2025-05-02. NVD baseline CVSS 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 3 sources updated this week
7.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.8Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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: __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

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 v3
7.8
EG Score
7.8(medium)
EG Risk
40(Track)
EG Risk 40/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity78% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
8%
KEV
Not listed

Published

May 2, 2025

Last Modified

August 5, 2026

Advisory Details (8)

Auto-updated Aug 5, 2026
No patch confirmed yet.
generic

net: caif: Fix use-after-free in cfusbl_device_notify() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/9781e98a97110f5e76999058368b4be76a788484
generic

net: caif: Fix use-after-free in cfusbl_device_notify() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/d1a11bbdbb5ea9f172019c5a4a3e9d8eabd72179
generic

net: caif: Fix use-after-free in cfusbl_device_notify() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/287027d8a567168a5d8ce5cb0cba16a34791a48c
generic

net: caif: Fix use-after-free in cfusbl_device_notify() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/3f14457e1584224f4296af613bbd99deb60b5d91
generic

net: caif: Fix use-after-free in cfusbl_device_notify() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/c3aaec463a632cf4187dc017e421bfa69d7834a9
generic

net: caif: Fix use-after-free in cfusbl_device_notify() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/9dc16be373b382ddd4c274052a6e870a95e76c01
generic

net: caif: Fix use-after-free in cfusbl_device_notify() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/1793da97a23e31c5bf06631f3f3e5a25f368fd64
generic

net: caif: Fix use-after-free in cfusbl_device_notify() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/68a45c3cf0e2242a533657f4f535d9b6a7447a79

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
linuxKernel @ 4.14.310—osv

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 14× in last 7d / 44× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 111 total refreshes for this CVE.

  1. 2026-08-07 16:25 UTCEPSS rescore
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  24. 2026-07-23 02:29 UTCEG score recompute
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Frequently asked(5)

What is CVE-2023-53138?
CVE-2023-53138 is a high vulnerability published on May 2, 2025. In the Linux kernel, the following vulnerability has been resolved: net: caif: Fix use-after-free in cfusbldevicenotify() syzbot reported use-after-free in cfusbldevicenotify() [1]. This causes a stack trace like below: BUG: KASAN: use-after-free in cfusbldevicenotify+0x7c9/0x870…
When was CVE-2023-53138 disclosed?
CVE-2023-53138 was first published in the National Vulnerability Database on May 2, 2025, with the most recent update on August 5, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2023-53138 actively exploited?
CVE-2023-53138 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 92.2% of all scored CVEs.
What is the CVSS score of CVE-2023-53138?
CVE-2023-53138 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2023-53138?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-53138, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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