CVE-2022-49398

published 2025-02-26

CVE-2022-49398: In the Linux kernel, the following vulnerability has been resolved: usb: dwc3: gadget: Replace list_for_each_entry_safe() if using giveback The…

Priority P4 21 medium 5.5 CVSS 3.1

AV L AC L PR L UI N S U C N I N A H

In the Linux kernel, the following vulnerability has been resolved:

usb: dwc3: gadget: Replace list_for_each_entry_safe() if using giveback

The list_for_each_entry_safe() macro saves the current item (n) and
the item after (n+1), so that n can be safely removed without
corrupting the list. However, when traversing the list and removing
items using gadget giveback, the DWC3 lock is briefly released,
allowing other routines to execute. There is a situation where, while
items are being removed from the cancelled_list using
dwc3_gadget_ep_cleanup_cancelled_requests(), the pullup disable
routine is running in parallel (due to UDC unbind). As the cleanup
routine removes n, and the pullup disable removes n+1, once the
cleanup retakes the DWC3 lock, it references a request who was already
removed/handled. With list debug enabled, this leads to a panic.
Ensure all instances of the macro are replaced where gadget giveback
is used.

Example call stack:

Thread#1:
__dwc3_gadget_ep_set_halt() - CLEAR HALT
-> dwc3_gadget_ep_cleanup_cancelled_requests()
->list_for_each_entry_safe()
->dwc3_gadget_giveback(n)
->dwc3_gadget_del_and_unmap_request()- n deleted[cancelled_list]
->spin_unlock
->Thread#2 executes
...
->dwc3_gadget_giveback(n+1)
->Already removed!

Thread#2:
dwc3_gadget_pullup()
->waiting for dwc3 spin_lock
...
->Thread#1 released lock
->dwc3_stop_active_transfers()
->dwc3_remove_requests()
->fetches n+1 item from cancelled_list (n removed by Thread#1)
->dwc3_gadget_giveback()
->dwc3_gadget_del_and_unmap_request()- n+1 deleted[cancelled_list]
->spin_unlock

Affected

15 ranges

Vendor	Product	Version range	Fixed in
debian	linux	< linux 5.18.5-1 (bookworm)	linux 5.18.5-1 (bookworm)
linux	linux	—	—
linux	linux	—	—
linux	linux	>= 4.19.57 < 4.20	4.20
linux	linux	>= d4f1afe5e896c18ae01099a85dab5e1a198bd2a8 < 1c6e5dc3b639c96e6839a8d1b8e951923fdfd34a	1c6e5dc3b639c96e6839a8d1b8e951923fdfd34a
linux	linux	>= d4f1afe5e896c18ae01099a85dab5e1a198bd2a8 < 2424307cdf421ac72075a1384eae4e4199ab6457	2424307cdf421ac72075a1384eae4e4199ab6457
linux	linux	>= d4f1afe5e896c18ae01099a85dab5e1a198bd2a8 < 26a7e6832afe9d9a991cfd9015177f083cf959cc	26a7e6832afe9d9a991cfd9015177f083cf959cc
linux	linux	>= d4f1afe5e896c18ae01099a85dab5e1a198bd2a8 < bf594d1d0c1d7b895954018043536ffd327844f9	bf594d1d0c1d7b895954018043536ffd327844f9
linux	linux_kernel	>= 0 < 5.18.5-1	5.18.5-1
linux	linux_kernel	>= 0 < 5.18.5-1	5.18.5-1
linux	linux_kernel	>= 0 < 5.18.5-1	5.18.5-1
linux	linux_kernel	>= 4.19.57 < 4.20	4.20
linux	linux_kernel	>= 5.0 < 5.15.47	5.15.47
linux	linux_kernel	>= 5.16 < 5.17.15	5.17.15
linux	linux_kernel	>= 5.18 < 5.18.4	5.18.4

CVSS provenance

nvd v3.1 5.5 MEDIUM CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

osv 5.5 MEDIUM

vendor_debian 5.5 MEDIUM

vendor_redhat 5.5 MEDIUM

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