ZDI-CAN-22166: New Vulnerability Report

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The attachment could not be scanned for viruses because it is a password protected file.
ZDI-CAN-22166: Linux Kernel usbnet Driver Race Condition Privilege Escalation Vulnerability

-- CVSS -----------------------------------------

7.1: AV:P/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H

-- ABSTRACT -------------------------------------

Trend Micro's Zero Day Initiative has identified a vulnerability affecting the following products:
Linux - Kernel

-- VULNERABILITY DETAILS ------------------------
* Version tested:6.6-rc1
* Installer file:-
* Platform tested:debian bullseye

---

### Analysis

```
race condition bug exist in usbnet driver
usbnet_disconnect() didn't flush/cancel the usbnet_deferred_kevent work queue before disconnecting
it can then trigger the UAF on struct net_device by racing bewteen usbnet_disconnect() and usbnet_deferred_kevent()
```


i patched the kernel to trigger it easily
```
diff --git a/drivers/net/usb/usbnet.c b/drivers/net/usb/usbnet.c
index 2d14b0d78..4183e7e07 100644
--- a/drivers/net/usb/usbnet.c
+++ b/drivers/net/usb/usbnet.c
@@ -30,7 +30,7 @@
 #include <linux/slab.h>
 #include <linux/kernel.h>
 #include <linux/pm_runtime.h>
-
+#include <linux/delay.h>
 /*-------------------------------------------------------------------------*/

 /*
@@ -1136,7 +1136,7 @@ usbnet_deferred_kevent (struct work_struct *work)
        struct usbnet           *dev =
                container_of(work, struct usbnet, kevent);
        int                     status;
-
+       msleep(100);
        /* usb_clear_halt() needs a thread context */
        if (test_bit (EVENT_TX_HALT, &dev->flags)) {
                unlink_urbs (dev, &dev->txq);
```

~~~C++
static void
usbnet_deferred_kevent (struct work_struct *work)
{
        struct usbnet           *dev =
                container_of(work, struct usbnet, kevent);
        int                     status;

        /* usb_clear_halt() needs a thread context */
        if (test_bit (EVENT_TX_HALT, &dev->flags)) {                    // access on the freed dev
                unlink_urbs (dev, &dev->txq);
                status = usb_autopm_get_interface(dev->intf);
                if (status < 0)
                        goto fail_pipe;
                status = usb_clear_halt (dev->udev, dev->out);
                usb_autopm_put_interface(dev->intf);
                if (status < 0 &&
                    status != -EPIPE &&
                    status != -ESHUTDOWN) {
                        if (netif_msg_tx_err (dev))
fail_pipe:
                                netdev_err(dev->net, "can't clear tx halt, status %d\n",
                                           status);
                } else {
                        clear_bit (EVENT_TX_HALT, &dev->flags);
                        if (status != -ESHUTDOWN)
                                netif_wake_queue (dev->net);
                }
        }
        if (test_bit (EVENT_RX_HALT, &dev->flags)) {
...
}

~~~


KASAN report
```
==================================================================
BUG: KASAN: slab-use-after-free in instrument_atomic_read /root/linux/./include/linux/instrumented.h:68
BUG: KASAN: slab-use-after-free in _test_bit /root/linux/./include/asm-generic/bitops/instrumented-non-atomic.h:141
BUG: KASAN: slab-use-after-free in usbnet_deferred_kevent+0x35/0xde0 /root/linux/drivers/net/usb/usbnet.c:1141
Read of size 8 at addr ffff8880213291a8 by task kworker/0:2/917

CPU: 0 PID: 917 Comm: kworker/0:2 Not tainted 6.6.0-rc1-dirty #2
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.0-debian-1.16.0-5 04/01/2014
Workqueue: events usbnet_deferred_kevent
Call Trace:
 <TASK>
 __dump_stack /root/linux/lib/dump_stack.c:88
 dump_stack_lvl+0xd9/0x1b0 /root/linux/lib/dump_stack.c:106
 print_address_description /root/linux/mm/kasan/report.c:364
 print_report+0xc4/0x620 /root/linux/mm/kasan/report.c:475
 kasan_report+0xda/0x110 /root/linux/mm/kasan/report.c:588
 check_region_inline /root/linux/mm/kasan/generic.c:181
 kasan_check_range+0xef/0x190 /root/linux/mm/kasan/generic.c:187
 instrument_atomic_read /root/linux/./include/linux/instrumented.h:68
 _test_bit /root/linux/./include/asm-generic/bitops/instrumented-non-atomic.h:141
 usbnet_deferred_kevent+0x35/0xde0 /root/linux/drivers/net/usb/usbnet.c:1141
 process_one_work+0x887/0x15d0 /root/linux/kernel/workqueue.c:2630
 process_scheduled_works /root/linux/kernel/workqueue.c:2703
 worker_thread+0x8bb/0x1290 /root/linux/kernel/workqueue.c:2784
 kthread+0x33a/0x430 /root/linux/kernel/kthread.c:388
 ret_from_fork+0x45/0x80 /root/linux/arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 /root/linux/arch/x86/entry/entry_64.S:304
 </TASK>

Allocated by task 4496:
 kasan_save_stack+0x33/0x50 /root/linux/mm/kasan/common.c:45
 kasan_set_track+0x25/0x30 /root/linux/mm/kasan/common.c:52
 ____kasan_kmalloc /root/linux/mm/kasan/common.c:374
 __kasan_kmalloc+0xa3/0xb0 /root/linux/mm/kasan/common.c:383
 kasan_kmalloc /root/linux/./include/linux/kasan.h:198
 __do_kmalloc_node /root/linux/mm/slab_common.c:1023
 __kmalloc_node+0x63/0x110 /root/linux/mm/slab_common.c:1030
 kmalloc_node /root/linux/./include/linux/slab.h:619
 kvmalloc_node+0x6f/0x1a0 /root/linux/mm/util.c:607
 kvmalloc /root/linux/./include/linux/slab.h:737
 kvzalloc /root/linux/./include/linux/slab.h:745
 alloc_netdev_mqs+0x9b/0x1290 /root/linux/net/core/dev.c:10681
 usbnet_probe+0x1bc/0x2850 /root/linux/drivers/net/usb/usbnet.c:1698
 usb_probe_interface+0x307/0x930 /root/linux/drivers/usb/core/driver.c:396
 call_driver_probe /root/linux/drivers/base/dd.c:579
 really_probe+0x234/0xc90 /root/linux/drivers/base/dd.c:658
 __driver_probe_device+0x1de/0x4b0 /root/linux/drivers/base/dd.c:800
 driver_probe_device+0x4c/0x1a0 /root/linux/drivers/base/dd.c:830
 __device_attach_driver+0x1d4/0x300 /root/linux/drivers/base/dd.c:958
 bus_for_each_drv+0x157/0x1d0 /root/linux/drivers/base/bus.c:457
 __device_attach+0x1e8/0x4b0 /root/linux/drivers/base/dd.c:1030
 bus_probe_device+0x17c/0x1c0 /root/linux/drivers/base/bus.c:532
 device_add+0x1182/0x1ac0 /root/linux/drivers/base/core.c:3622
 usb_set_configuration+0x10cb/0x1c40 /root/linux/drivers/usb/core/message.c:2207
 usb_generic_driver_probe+0xca/0x130 /root/linux/drivers/usb/core/generic.c:238
 usb_probe_device+0xda/0x2c0 /root/linux/drivers/usb/core/driver.c:293
 call_driver_probe /root/linux/drivers/base/dd.c:579
 really_probe+0x234/0xc90 /root/linux/drivers/base/dd.c:658
 __driver_probe_device+0x1de/0x4b0 /root/linux/drivers/base/dd.c:800
 driver_probe_device+0x4c/0x1a0 /root/linux/drivers/base/dd.c:830
 __device_attach_driver+0x1d4/0x300 /root/linux/drivers/base/dd.c:958
 bus_for_each_drv+0x157/0x1d0 /root/linux/drivers/base/bus.c:457
 __device_attach+0x1e8/0x4b0 /root/linux/drivers/base/dd.c:1030
 bus_probe_device+0x17c/0x1c0 /root/linux/drivers/base/bus.c:532
 device_add+0x1182/0x1ac0 /root/linux/drivers/base/core.c:3622
 usb_new_device+0xd8c/0x1950 /root/linux/drivers/usb/core/hub.c:2589
 hub_port_connect /root/linux/drivers/usb/core/hub.c:5440
 hub_port_connect_change /root/linux/drivers/usb/core/hub.c:5580
 port_event /root/linux/drivers/usb/core/hub.c:5740
 hub_event+0x2daf/0x4e00 /root/linux/drivers/usb/core/hub.c:5822
 process_one_work+0x887/0x15d0 /root/linux/kernel/workqueue.c:2630
 process_scheduled_works /root/linux/kernel/workqueue.c:2703
 worker_thread+0x8bb/0x1290 /root/linux/kernel/workqueue.c:2784
 kthread+0x33a/0x430 /root/linux/kernel/kthread.c:388
 ret_from_fork+0x45/0x80 /root/linux/arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 /root/linux/arch/x86/entry/entry_64.S:304

Freed by task 4496:
 kasan_save_stack+0x33/0x50 /root/linux/mm/kasan/common.c:45
 kasan_set_track+0x25/0x30 /root/linux/mm/kasan/common.c:52
 kasan_save_free_info+0x28/0x40 /root/linux/mm/kasan/generic.c:522
 ____kasan_slab_free /root/linux/mm/kasan/common.c:236
 ____kasan_slab_free+0x138/0x190 /root/linux/mm/kasan/common.c:200
 kasan_slab_free /root/linux/./include/linux/kasan.h:164
 __cache_free /root/linux/mm/slab.c:3370
 __do_kmem_cache_free /root/linux/mm/slab.c:3557
 __kmem_cache_free+0xcc/0x2d0 /root/linux/mm/slab.c:3564
 kvfree+0x47/0x50 /root/linux/mm/util.c:653
 device_release+0xa1/0x240 /root/linux/drivers/base/core.c:2484
 kobject_cleanup /root/linux/lib/kobject.c:682
 kobject_release /root/linux/lib/kobject.c:716
 kref_put /root/linux/./include/linux/kref.h:65
 kobject_put+0x1d0/0x440 /root/linux/lib/kobject.c:733
 put_device+0x1f/0x30 /root/linux/drivers/base/core.c:3730
 free_netdev+0x408/0x5f0 /root/linux/net/core/dev.c:10831
 usbnet_disconnect+0x26b/0x540 /root/linux/drivers/net/usb/usbnet.c:1637
 usb_unbind_interface+0x1dd/0x8d0 /root/linux/drivers/usb/core/driver.c:458
 device_remove /root/linux/drivers/base/dd.c:569
 device_remove+0x11f/0x170 /root/linux/drivers/base/dd.c:561
 __device_release_driver /root/linux/drivers/base/dd.c:1272
 device_release_driver_internal+0x44a/0x610 /root/linux/drivers/base/dd.c:1295
 bus_remove_device+0x22c/0x420 /root/linux/drivers/base/bus.c:574
 device_del+0x39a/0xa50 /root/linux/drivers/base/core.c:3811
 usb_disable_device+0x36c/0x7f0 /root/linux/drivers/usb/core/message.c:1416
 usb_disconnect+0x2e1/0x890 /root/linux/drivers/usb/core/hub.c:2252
 hub_port_connect /root/linux/drivers/usb/core/hub.c:5280
 hub_port_connect_change /root/linux/drivers/usb/core/hub.c:5580
 port_event /root/linux/drivers/usb/core/hub.c:5740
 hub_event+0x1db7/0x4e00 /root/linux/drivers/usb/core/hub.c:5822
 process_one_work+0x887/0x15d0 /root/linux/kernel/workqueue.c:2630
 process_scheduled_works /root/linux/kernel/workqueue.c:2703
 worker_thread+0x8bb/0x1290 /root/linux/kernel/workqueue.c:2784
 kthread+0x33a/0x430 /root/linux/kernel/kthread.c:388
 ret_from_fork+0x45/0x80 /root/linux/arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 /root/linux/arch/x86/entry/entry_64.S:304

Last potentially related work creation:
 kasan_save_stack+0x33/0x50 /root/linux/mm/kasan/common.c:45
 __kasan_record_aux_stack+0x78/0x80 /root/linux/mm/kasan/generic.c:492
 insert_work+0x38/0x230 /root/linux/kernel/workqueue.c:1647
 __queue_work+0x5d2/0x1060 /root/linux/kernel/workqueue.c:1799
 queue_work_on+0xed/0x110 /root/linux/kernel/workqueue.c:1834
 queue_work /root/linux/./include/linux/workqueue.h:554
 schedule_work /root/linux/./include/linux/workqueue.h:615
 usbnet_defer_kevent+0x7b/0x240 /root/linux/drivers/net/usb/usbnet.c:470
 usbnet_link_change /root/linux/drivers/net/usb/usbnet.c:2000
 usbnet_probe+0x1a4b/0x2850 /root/linux/drivers/net/usb/usbnet.c:1845
 usb_probe_interface+0x307/0x930 /root/linux/drivers/usb/core/driver.c:396
 call_driver_probe /root/linux/drivers/base/dd.c:579
 really_probe+0x234/0xc90 /root/linux/drivers/base/dd.c:658
 __driver_probe_device+0x1de/0x4b0 /root/linux/drivers/base/dd.c:800
 driver_probe_device+0x4c/0x1a0 /root/linux/drivers/base/dd.c:830
 __device_attach_driver+0x1d4/0x300 /root/linux/drivers/base/dd.c:958
 bus_for_each_drv+0x157/0x1d0 /root/linux/drivers/base/bus.c:457
 __device_attach+0x1e8/0x4b0 /root/linux/drivers/base/dd.c:1030
 bus_probe_device+0x17c/0x1c0 /root/linux/drivers/base/bus.c:532
 device_add+0x1182/0x1ac0 /root/linux/drivers/base/core.c:3622
 usb_set_configuration+0x10cb/0x1c40 /root/linux/drivers/usb/core/message.c:2207
 usb_generic_driver_probe+0xca/0x130 /root/linux/drivers/usb/core/generic.c:238
 usb_probe_device+0xda/0x2c0 /root/linux/drivers/usb/core/driver.c:293
 call_driver_probe /root/linux/drivers/base/dd.c:579
 really_probe+0x234/0xc90 /root/linux/drivers/base/dd.c:658
 __driver_probe_device+0x1de/0x4b0 /root/linux/drivers/base/dd.c:800
 driver_probe_device+0x4c/0x1a0 /root/linux/drivers/base/dd.c:830
 __device_attach_driver+0x1d4/0x300 /root/linux/drivers/base/dd.c:958
 bus_for_each_drv+0x157/0x1d0 /root/linux/drivers/base/bus.c:457
 __device_attach+0x1e8/0x4b0 /root/linux/drivers/base/dd.c:1030
 bus_probe_device+0x17c/0x1c0 /root/linux/drivers/base/bus.c:532
 device_add+0x1182/0x1ac0 /root/linux/drivers/base/core.c:3622
 usb_new_device+0xd8c/0x1950 /root/linux/drivers/usb/core/hub.c:2589
 hub_port_connect /root/linux/drivers/usb/core/hub.c:5440
 hub_port_connect_change /root/linux/drivers/usb/core/hub.c:5580
 port_event /root/linux/drivers/usb/core/hub.c:5740
 hub_event+0x2daf/0x4e00 /root/linux/drivers/usb/core/hub.c:5822
 process_one_work+0x887/0x15d0 /root/linux/kernel/workqueue.c:2630
 process_scheduled_works /root/linux/kernel/workqueue.c:2703
 worker_thread+0x8bb/0x1290 /root/linux/kernel/workqueue.c:2784
 kthread+0x33a/0x430 /root/linux/kernel/kthread.c:388
 ret_from_fork+0x45/0x80 /root/linux/arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 /root/linux/arch/x86/entry/entry_64.S:304

The buggy address belongs to the object at ffff888021328000
 which belongs to the cache kmalloc-cg-8k of size 8192
The buggy address is located 4520 bytes inside of
 freed 8192-byte region [ffff888021328000, ffff88802132a000)

The buggy address belongs to the physical page:
page:ffffea000084ca00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x21328
head:ffffea000084ca00 order:2 entire_mapcount:0 nr_pages_mapped:0 pincount:0
memcg:ffff8880172b3201
flags: 0xfff00000000840(slab|head|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0x1()
raw: 00fff00000000840 ffff888012c4db00 ffffea00006ebd10 ffff888012c4cc50
raw: 0000000000000000 ffff888021328000 0000000100000001 ffff8880172b3201
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Unmovable, gfp_mask 0x2460c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_RETRY_MAYFAIL|__GFP_COMP|__GFP_THISNODE), pid 4496, tgid 4496 (kworker/0:4), ts 173334243118, free_ts9
 set_page_owner /root/linux/./include/linux/page_owner.h:31
 post_alloc_hook+0x2cf/0x340 /root/linux/mm/page_alloc.c:1536
 prep_new_page /root/linux/mm/page_alloc.c:1543
 get_page_from_freelist+0xee0/0x2f20 /root/linux/mm/page_alloc.c:3170
 __alloc_pages+0x1d0/0x4a0 /root/linux/mm/page_alloc.c:4426
 __alloc_pages_node /root/linux/./include/linux/gfp.h:237
 kmem_getpages /root/linux/mm/slab.c:1356
 cache_grow_begin+0x99/0x3a0 /root/linux/mm/slab.c:2550
 cache_alloc_refill+0x294/0x3a0 /root/linux/mm/slab.c:2923
 ____cache_alloc /root/linux/mm/slab.c:2999
 ____cache_alloc /root/linux/mm/slab.c:2982
 __do_cache_alloc /root/linux/mm/slab.c:3182
 slab_alloc_node /root/linux/mm/slab.c:3230
 __kmem_cache_alloc_node+0x3c9/0x470 /root/linux/mm/slab.c:3521
 __do_kmalloc_node /root/linux/mm/slab_common.c:1022
 __kmalloc_node+0x52/0x110 /root/linux/mm/slab_common.c:1030
 kmalloc_node /root/linux/./include/linux/slab.h:619
 kvmalloc_node+0x6f/0x1a0 /root/linux/mm/util.c:607
 kvmalloc /root/linux/./include/linux/slab.h:737
 kvzalloc /root/linux/./include/linux/slab.h:745
 alloc_netdev_mqs+0x9b/0x1290 /root/linux/net/core/dev.c:10681
 usbnet_probe+0x1bc/0x2850 /root/linux/drivers/net/usb/usbnet.c:1698
 usb_probe_interface+0x307/0x930 /root/linux/drivers/usb/core/driver.c:396
 call_driver_probe /root/linux/drivers/base/dd.c:579
 really_probe+0x234/0xc90 /root/linux/drivers/base/dd.c:658
 __driver_probe_device+0x1de/0x4b0 /root/linux/drivers/base/dd.c:800
 driver_probe_device+0x4c/0x1a0 /root/linux/drivers/base/dd.c:830
 __device_attach_driver+0x1d4/0x300 /root/linux/drivers/base/dd.c:958
 bus_for_each_drv+0x157/0x1d0 /root/linux/drivers/base/bus.c:457
page last free stack trace:
 reset_page_owner /root/linux/./include/linux/page_owner.h:24
 free_pages_prepare /root/linux/mm/page_alloc.c:1136
 free_unref_page_prepare+0x476/0xa40 /root/linux/mm/page_alloc.c:2312
 free_unref_page+0x33/0x3b0 /root/linux/mm/page_alloc.c:2405
 slab_destroy /root/linux/mm/slab.c:1608
 slabs_destroy+0x85/0xc0 /root/linux/mm/slab.c:1628
 drain_array+0x91/0xa0 /root/linux/mm/slab.c:3795
 cache_reap+0x164/0x330 /root/linux/mm/slab.c:3833
 process_one_work+0x887/0x15d0 /root/linux/kernel/workqueue.c:2630
 process_scheduled_works /root/linux/kernel/workqueue.c:2703
 worker_thread+0x8bb/0x1290 /root/linux/kernel/workqueue.c:2784
 kthread+0x33a/0x430 /root/linux/kernel/kthread.c:388
 ret_from_fork+0x45/0x80 /root/linux/arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 /root/linux/arch/x86/entry/entry_64.S:304

Memory state around the buggy address:
 ffff888021329080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888021329100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888021329180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                  ^
 ffff888021329200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888021329280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
```


-- CREDIT ---------------------------------------
This vulnerability was discovered by:
Lucas Leong (@_wmliang_) of Trend Micro Zero Day Initiative

-- FURTHER DETAILS ------------------------------

Supporting files:


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  http://www.zerodayinitiative.com/documents/disclosures-pgp-key.asc

-- INFORMATION ABOUT THE ZDI --------------------
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<<attachment: ZDI-CAN-22166.zip>>


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