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CVE-2021-20196

Status Candidate

Overview

A NULL pointer dereference flaw was found in the floppy disk emulator of QEMU. This issue occurs while processing read/write ioport commands if the selected floppy drive is not initialized with a block device. This flaw allows a privileged guest user to crash the QEMU process on the host, resulting in a denial of service. The highest threat from this vulnerability is to system availability.

Related Files

Red Hat Security Advisory 2022-1759-01
Posted May 11, 2022
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2022-1759-01 - Kernel-based Virtual Machine offers a full virtualization solution for Linux on numerous hardware platforms. The virt:rhel module contains packages which provide user-space components used to run virtual machines using KVM. The packages also provide APIs for managing and interacting with the virtualized systems. Issues addressed include buffer overflow, integer overflow, null pointer, out of bounds access, out of bounds read, and use-after-free vulnerabilities.

tags | advisory, overflow, kernel, vulnerability
systems | linux, redhat
advisories | CVE-2021-20196, CVE-2021-33285, CVE-2021-33286, CVE-2021-33287, CVE-2021-33289, CVE-2021-35266, CVE-2021-35267, CVE-2021-35268, CVE-2021-35269, CVE-2021-3622, CVE-2021-3716, CVE-2021-3748, CVE-2021-39251, CVE-2021-39252, CVE-2021-39253, CVE-2021-39254, CVE-2021-39255, CVE-2021-39256, CVE-2021-39257, CVE-2021-39258, CVE-2021-39259, CVE-2021-39260, CVE-2021-39261, CVE-2021-39262, CVE-2021-39263, CVE-2021-3975, CVE-2021-4145
SHA-256 | cf2c26724e7650e1aeb0964cd78478438588a1ed37ddff36eb738dc4866cc442
Ubuntu Security Notice USN-5307-1
Posted Feb 28, 2022
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 5307-1 - Gaoning Pan discovered that QEMU incorrectly handled the floppy disk emulator. An attacker inside the guest could use this issue to cause QEMU to crash, resulting in a denial of service. Gaoning Pan discovered that the QEMU vmxnet3 NIC emulator incorrectly handled certain values. An attacker inside the guest could use this issue to cause QEMU to crash, resulting in a denial of service. It was discovered that the QEMU vhost-user GPU device contained several security issues. An attacker inside the guest could use these issues to cause QEMU to crash, resulting in a denial of service, leak sensitive information, or possibly execute arbitrary code. This issue only affected Ubuntu 21.10.

tags | advisory, denial of service, arbitrary
systems | linux, ubuntu
advisories | CVE-2021-20196, CVE-2021-20203, CVE-2021-3546, CVE-2021-3682, CVE-2021-3713, CVE-2021-3748, CVE-2021-3930, CVE-2021-4158, CVE-2022-0358
SHA-256 | 93c74c6aff190d655abe77b615cbb1fdb9e7fd27501547e3980eeee5e03af9e9
Red Hat Security Advisory 2022-0397-03
Posted Feb 2, 2022
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2022-0397-03 - The Advanced Virtualization module provides the user-space component for running virtual machines that use KVM in environments managed by Red Hat products. Issues addressed include a null pointer vulnerability.

tags | advisory
systems | linux, redhat
advisories | CVE-2021-20196, CVE-2021-3716
SHA-256 | 8f90f6bab53b7df3482285a4e9007416d2321d7b9947b9347db440fffe5d9aee
Red Hat Security Advisory 2022-0325-02
Posted Feb 1, 2022
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2022-0325-02 - The Advanced Virtualization module provides the user-space component for running virtual machines that use KVM in environments managed by Red Hat products. Issues addressed include a null pointer vulnerability.

tags | advisory
systems | linux, redhat
advisories | CVE-2021-20196
SHA-256 | 2f756be831daa8b04039f8fa6ef306f944e0c3dcb2f24b69f92dcdd73479c8c7
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