Summary
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. (CVE-2021-3667)
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. (CVE-2021-3975)
It was discovered that libvirt incorrectly handled the libxl driver. An
attacker inside a guest could possibly use this issue to cause libvirtd
to crash or stop responding, resulting in a denial of service. This issue
only affected Ubuntu 18.04 LTS, Ubuntu 20.04 LTS, and Ubuntu 21.10.
(CVE-2021-4147)
It was discovered that libvirt incorrectly handled the nwfilter driver. A
local attacker could possibly use this issue to cause libvirt to crash,
resulting in a denial of service. (CVE-2022-0897)
It was discovered that libvirt incorrectly handled the polkit access
control driver. 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. (CVE-2020-25637)
It was discovered that libvirt incorrectly generated SELinux labels. In
environments using SELinux, this issue could allow the sVirt confinement
to be bypassed. This issue only affected Ubuntu 18.04 LTS and Ubuntu 20.04
LTS. (CVE-2021-3631)
Fixed packages 2
| Release | Package | Fixed in |
|---|---|---|
| Ubuntu · 18.04 LTS 18.04:LTS | libvirt | 4.0.0-1ubuntu8.21 |
| Ubuntu · 20.04 LTS 20.04:LTS | libvirt | 6.0.0-0ubuntu8.16 |
Vulnerabilities 6
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Unscored —CVE-2020-25637 Public exploit
A double free memory issue was found to occur in the libvirt API, in versions before 6.8.0, responsible for requesting …
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Unscored —
A flaw was found in libvirt while it generates SELinux MCS category pairs for VMs' dynamic labels. This flaw allows one…
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Unscored —
An improper locking issue was found in the virStoragePoolLookupByTargetPath API of libvirt. It occurs in the storagePoo…
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Unscored —CVE-2021-3975 Public exploit
A use-after-free flaw was found in libvirt. The qemuMonitorUnregister() function in qemuProcessHandleMonitorEOF is call…
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Unscored —
A flaw was found in the libvirt libxl driver. A malicious guest could continuously reboot itself and cause libvirtd on …
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Unscored —
A flaw was found in the libvirt nwfilter driver. The virNWFilterObjListNumOfNWFilters method failed to acquire the driv…