Bug 1879808 (CVE-2020-25625) - CVE-2020-25625 QEMU: usb: hcd-ohci: infinite loop issue while processing transfer descriptors
Summary: CVE-2020-25625 QEMU: usb: hcd-ohci: infinite loop issue while processing tran...
Keywords:
Status: CLOSED WONTFIX
Alias: CVE-2020-25625
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1879809 1879810 1910674
Blocks: 1867982
TreeView+ depends on / blocked
 
Reported: 2020-09-17 05:32 UTC by Prasad J Pandit
Modified: 2022-04-17 21:01 UTC (History)
25 users (show)

Fixed In Version: QEMU 5.1.1
Doc Type: ---
Doc Text:
An infinite loop flaw was found in the USB OHCI controller emulator of QEMU. This flaw occurs while servicing OHCI isochronous transfer descriptors (TD) in the ohci_service_iso_td routine, as it retires a TD if it has passed its time frame. It does not check if the TD was already processed and holds an error code in TD_CC. This issue may happen if the TD list has a loop. This flaw allows a guest user or process to consume CPU cycles on the host, resulting in a denial of service.
Clone Of:
Environment:
Last Closed: 2021-12-15 12:06:05 UTC


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Description Prasad J Pandit 2020-09-17 05:32:01 UTC
An infinite loop issue was found in the USB OHCI controller emulator of QEMU. It could occur while servicing OHCI isochronous transfer descriptors (TD) in ohci_service_iso_td routine, as it retires a TD if it has passed its time frame. While do so it does not check if the TD was already processed ones and holds an error code in TD_CC. It may happen if the TD list has a loop. A guest user/process may use this flaw to consume cpu cycles on the host resulting in DoS scenario.

Upstream patch:
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  -> https://lists.nongnu.org/archive/html/qemu-devel/2020-09/msg05905.html

Reference:
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  -> https://www.openwall.com/lists/oss-security/2020/09/17/1

Comment 1 Prasad J Pandit 2020-09-17 05:32:39 UTC
Created qemu tracking bugs for this issue:

Affects: fedora-all [bug 1879809]


Created xen tracking bugs for this issue:

Affects: fedora-all [bug 1879810]


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