Date: Fri, 5 Feb 2021 12:45:04 +0530 (IST) From: P J P <ppandit@...hat.com> To: oss security list <oss-security@...ts.openwall.com> cc: Cheolwoo Myung <cwmyung@....ac.kr> Subject: CVE-2021-3392 QEMU: scsi: mptsas: use-after-free while processing io requests Hello, A use-after-free issue was found in the Megaraid emulator of the QEMU. It occurs while processing SCSI i/o requests because in case of an error mptsas_free_request() does not dequeue request object 'req' from a pending requests' queue. Which later gets processed resulting in the said use-after-free issue. A privileged guest user may use this flaw to crash the QEMU process on the host resulting in DoS scenario. Upstream patch: --------------- -> https://lists.gnu.org/archive/html/qemu-devel/2021-02/msg00488.html This issue was reported by Cheolwoo Myung of Seoul National University. Thank you. -- Prasad J Pandit / Red Hat Product Security Team 8685 545E B54C 486B C6EB 271E E285 8B5A F050 DE8D
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