CVE-2021-3975
Published: 24 November 2021
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.
Priority
Status
Package | Release | Status |
---|---|---|
libvirt Launchpad, Ubuntu, Debian |
jammy |
Released
(7.6.0-0ubuntu3)
|
kinetic |
Released
(7.6.0-0ubuntu3)
|
|
lunar |
Released
(7.6.0-0ubuntu3)
|
|
bionic |
Released
(4.0.0-1ubuntu8.21)
|
|
focal |
Released
(6.0.0-0ubuntu8.16)
|
|
hirsute |
Ignored
(end of life)
|
|
impish |
Not vulnerable
(7.6.0-0ubuntu1)
|
|
trusty |
Needs triage
|
|
upstream |
Released
(7.6.0-1)
|
|
xenial |
Needs triage
|
|
mantic |
Released
(7.6.0-0ubuntu3)
|
|
Patches: upstream: https://github.com/libvirt/libvirt/commit/1ac703a7d0789e46833f4013a3876c2e3af18ec7 |
Severity score breakdown
Parameter | Value |
---|---|
Base score | 6.5 |
Attack vector | Network |
Attack complexity | Low |
Privileges required | Low |
User interaction | None |
Scope | Unchanged |
Confidentiality | None |
Integrity impact | None |
Availability impact | High |
Vector | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |