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CVE-2021-3975

Status Candidate

Overview

A use-after-free flaw was found in libvirt. The qemuMonitorUnregister() function in qemuProcessHandleMonitorEOF is called using multiple threads without being adequately protected by a monitor lock. This flaw could be triggered by the virConnectGetAllDomainStats API when the guest is shutting down. An unprivileged client with a read-only connection could use this flaw to perform a denial of service attack by causing the libvirt daemon to crash.

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-5399-1
Posted May 3, 2022
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 5399-1 - It was discovered that libvirt incorrectly handled certain locking operations. A local attacker could possibly use this issue to cause libvirt to stop accepting connections, resulting in a denial of service. This issue only affected Ubuntu 20.04 LTS. It was discovered that libvirt incorrectly handled threads during shutdown. A local attacker could possibly use this issue to cause libvirt to crash, resulting in a denial of service. This issue only affected Ubuntu 18.04 LTS and Ubuntu 20.04 LTS.

tags | advisory, denial of service, local
systems | linux, ubuntu
advisories | CVE-2020-25637, CVE-2021-3631, CVE-2021-3667, CVE-2021-3975, CVE-2021-4147, CVE-2022-0897
SHA-256 | ecde89a4a69ba2a401078fac9b6ebd27b6866ca9b8427c3d6373d74a202dfd28
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