Date: Thu, 28 Jan 2021 12:29:04 +0530 (IST) From: P J P <ppandit@...hat.com> To: oss security list <oss-security@...ts.openwall.com> cc: Gaoning Pan <pgn@....edu.cn> Subject: CVE-2021-20196 QEMU: block: fdc: null pointer dereference may lead to guest crash Hello, A NULL pointer dereference issue was found in the Floopy disk emulator of QEMU. It could occur while processing read/write ioport commands, if the selected Floopy drive is not initialised with a block device. A privileged guest user could use this flaw to crash the QEMU process on the host resulting in DoS scenario. Upstream patch: --------------- -> https://lists.nongnu.org/archive/html/qemu-devel/2021-01/msg05986.html This issue was reported by Gaoning Pan of Zhejiang University & Ant Security Light-Year Lab. Thank you. -- Prasad J Pandit / Red Hat Product Security Team 8685 545E B54C 486B C6EB 271E E285 8B5A F050 DE8D
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