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CVE-2022-0897

Status Candidate

Overview

A flaw was found in the libvirt nwfilter driver. The virNWFilterObjListNumOfNWFilters method failed to acquire the `driver->nwfilters` mutex before iterating over virNWFilterObj instances. There was no protection to stop another thread from concurrently modifying the `driver->nwfilters` object. This flaw allows a malicious, unprivileged user to exploit this issue via libvirt’s API virConnectNumOfNWFilters to crash the network filter management daemon (libvirtd/virtnwfilterd).

Related Files

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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