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 |