net: caif: Fix use-after-free in cfusbl_device_notify()

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2023-53138
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-05-02 16:15:32 UTC
Updated2026-08-04 10:18:56 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Problem Types: CWE-416

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 7ad65bf68d705b445ef10b77ab50dab22be185ee 68a45c3cf0e2242a533657f4f535d9b6a7447a79 git Not specified
CNA Linux Linux affected 7ad65bf68d705b445ef10b77ab50dab22be185ee 1793da97a23e31c5bf06631f3f3e5a25f368fd64 git Not specified
CNA Linux Linux affected 7ad65bf68d705b445ef10b77ab50dab22be185ee 9dc16be373b382ddd4c274052a6e870a95e76c01 git Not specified
CNA Linux Linux affected 7ad65bf68d705b445ef10b77ab50dab22be185ee c3aaec463a632cf4187dc017e421bfa69d7834a9 git Not specified
CNA Linux Linux affected 7ad65bf68d705b445ef10b77ab50dab22be185ee 3f14457e1584224f4296af613bbd99deb60b5d91 git Not specified
CNA Linux Linux affected 7ad65bf68d705b445ef10b77ab50dab22be185ee 287027d8a567168a5d8ce5cb0cba16a34791a48c git Not specified
CNA Linux Linux affected 7ad65bf68d705b445ef10b77ab50dab22be185ee d1a11bbdbb5ea9f172019c5a4a3e9d8eabd72179 git Not specified
CNA Linux Linux affected 7ad65bf68d705b445ef10b77ab50dab22be185ee 9781e98a97110f5e76999058368b4be76a788484 git Not specified
CNA Linux Linux affected 3.3 Not specified
CNA Linux Linux unaffected 3.3 semver Not specified
CNA Linux Linux unaffected 4.14.310 4.14.* semver Not specified
CNA Linux Linux unaffected 4.19.278 4.19.* semver Not specified
CNA Linux Linux unaffected 5.4.237 5.4.* semver Not specified
CNA Linux Linux unaffected 5.10.175 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.103 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.20 6.1.* semver Not specified
CNA Linux Linux unaffected 6.2.7 6.2.* semver Not specified
CNA Linux Linux unaffected 6.3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/287027d8a567168a5d8ce5cb0cba16a34791a48c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/1793da97a23e31c5bf06631f3f3e5a25f368fd64 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/3f14457e1584224f4296af613bbd99deb60b5d91 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/c3aaec463a632cf4187dc017e421bfa69d7834a9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/9dc16be373b382ddd4c274052a6e870a95e76c01 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/9781e98a97110f5e76999058368b4be76a788484 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/d1a11bbdbb5ea9f172019c5a4a3e9d8eabd72179 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/68a45c3cf0e2242a533657f4f535d9b6a7447a79 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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