Date: Fri, 5 Feb 2021 12:41:59 +0530 (IST) From: P J P <ppandit@...hat.com> To: oss security list <oss-security@...ts.openwall.com> Subject: CVE-2021-20221 QEMU: aarch64: GIC: out-of-bound heap buffer access via an interrupt ID field Hello, An out-of-bounds heap buffer access issue was found in the ARM Generic Interrupt Controller emulator of QEMU on aarch64 platform. The issue occurs because while writing an interrupt ID to the controller memory area, it is not masked to be 4 bits wide. It may lead to the said issue while updating controller state fields and their subsequent processing. A privileged guest user may use this flaw to crash the QEMU process on the host resulting in DoS scenario. It requires unusual kernel start-up with 'kernel-irqchip=off'. It does not affect default configuration ie. kernel-irqchip=on. Upstream patch: --------------- -> https://gitlab.com/qemu-project/qemu/-/commit/edfe2eb4360cde4ed5d95bda7777edcb3510f76a Thank you. -- Prasad J Pandit / Red Hat Product Security Team 8685 545E B54C 486B C6EB 271E E285 8B5A F050 DE8D
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