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List:       oss-security
Subject:    [oss-security] CVE-2021-20257 QEMU: net: e1000: infinite loop while processing transmit descriptors
From:       P J P <ppandit () redhat ! com>
Date:       2021-02-25 11:40:53
Message-ID: o215932q-o26q-5o78-nr77-p0s99088rr23 () erqung ! pbz
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   Hello,

An infinite loop issue was found in the e1000 NIC emulator of the QEMU. It 
occurs while processing transmit (tx) descriptors in process_tx_desc, if 
various descriptor fields are initialised with invalid values. A guest may use 
this flaw to consume cpu cycles on the host resulting in DoS scenario.

Upstream patch:
---------------
   -> https://lists.gnu.org/archive/html/qemu-devel/2021-02/msg07428.html

'CVE-2021-20257' assigned by Red Hat Inc.

This issue was independently reported by Sergej Schumilo, Cornelius 
Aschermann, Simon Werner of Ruhr-University Bochum; Cheolwoo Myung of Seoul 
National University; And Alexander Bulekov (CC'd).


Thank you.
--
Prasad J Pandit / Red Hat Product Security Team
8685 545E B54C 486B C6EB 271E E285 8B5A F050 DE8D

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