oss-security - CVE-2021-3416 QEMU: net: infinite loop in loopback mode may lead tostack overflow

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Date: Fri, 26 Feb 2021 20:16:15 +0530 (IST)
From: P J P <ppandit@...hat.com>
To: oss security list <oss-security@...ts.openwall.com>
Subject: CVE-2021-3416 QEMU: net: infinite loop in loopback mode may lead
 tostack overflow

   Hello,

A potential stack overflow via infinite loop issue was found in various NIC 
emulators of QEMU. The said issue occurs in loopback mode of a NIC wherein 
reentrant DMA checks may get bypassed. A guest user/process may use this flaw 
to consume cpu cycles or crash the QEMU process on the host resulting in DoS 
scenario.

Upstream patch:
---------------
   -> https://lists.gnu.org/archive/html/qemu-devel/2021-02/msg07431.html
   -> https://lists.gnu.org/archive/html/qemu-devel/2021-02/msg07484.html

'CVE-2021-3416' assigned via Red Hat Inc.

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

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