CVE-2023-53138net: caif: Fix use-after-free in cfusbl_device_notify()
- 7.8HighCVSS base score
- 0.19%Exploitation in 30 daysEPSS · top 91% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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.
Timeline
ID reserved
By Linux
Published
- 15 months later
· 15 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Modified | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.19% · top 91% of all CVEs (15 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.
Affected products
- affected 7ad65bf68d705b445ef10b77ab50dab22be185ee – < 68a45c3cf0e2242a533657f4f535d9b6a7447a79
- affected 7ad65bf68d705b445ef10b77ab50dab22be185ee – < 1793da97a23e31c5bf06631f3f3e5a25f368fd64
- affected 7ad65bf68d705b445ef10b77ab50dab22be185ee – < 9dc16be373b382ddd4c274052a6e870a95e76c01
- affected 7ad65bf68d705b445ef10b77ab50dab22be185ee – < c3aaec463a632cf4187dc017e421bfa69d7834a9
- affected 7ad65bf68d705b445ef10b77ab50dab22be185ee – < 3f14457e1584224f4296af613bbd99deb60b5d91
- affected 7ad65bf68d705b445ef10b77ab50dab22be185ee – < 287027d8a567168a5d8ce5cb0cba16a34791a48c
- affected 7ad65bf68d705b445ef10b77ab50dab22be185ee – < d1a11bbdbb5ea9f172019c5a4a3e9d8eabd72179
- affected 7ad65bf68d705b445ef10b77ab50dab22be185ee – < 9781e98a97110f5e76999058368b4be76a788484
- affected 3.3
- unaffected < 3.3
- unaffected 4.14.310 – ≤ 4.14.*
- unaffected 4.19.278 – ≤ 4.19.*
- unaffected 5.4.237 – ≤ 5.4.*
- unaffected 5.10.175 – ≤ 5.10.*
- unaffected 5.15.103 – ≤ 5.15.*
- unaffected 6.1.20 – ≤ 6.1.*
- unaffected 6.2.7 – ≤ 6.2.*
- unaffected 6.3 – ≤ *
References
References8
- https://git.kernel.org/stable/c/68a45c3cf0e2242a533657f4f535d9b6a7447a79 (opens in a new tab)
- https://git.kernel.org/stable/c/1793da97a23e31c5bf06631f3f3e5a25f368fd64 (opens in a new tab)
- https://git.kernel.org/stable/c/9dc16be373b382ddd4c274052a6e870a95e76c01 (opens in a new tab)
- https://git.kernel.org/stable/c/c3aaec463a632cf4187dc017e421bfa69d7834a9 (opens in a new tab)
- https://git.kernel.org/stable/c/3f14457e1584224f4296af613bbd99deb60b5d91 (opens in a new tab)
- https://git.kernel.org/stable/c/287027d8a567168a5d8ce5cb0cba16a34791a48c (opens in a new tab)
- https://git.kernel.org/stable/c/d1a11bbdbb5ea9f172019c5a4a3e9d8eabd72179 (opens in a new tab)
- https://git.kernel.org/stable/c/9781e98a97110f5e76999058368b4be76a788484 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2025-13119 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
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[](https://cveledger.app/cve/CVE-2023-53138)Record last updated .