| Name | CVE-2021-3975 |
| Description | 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. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| References | DLA-3778-1 |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| libvirt (PTS) | buster | 5.0.0-4+deb10u1 | vulnerable |
| buster (security) | 5.0.0-4+deb10u2 | fixed |
| bullseye | 7.0.0-3+deb11u2 | vulnerable |
| bookworm | 9.0.0-4 | fixed |
| trixie | 10.0.0-2 | fixed |
| sid | 10.2.0-1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|
| libvirt | source | buster | 5.0.0-4+deb10u2 | | DLA-3778-1 | |
| libvirt | source | (unstable) | 7.6.0-1 | | | |
Notes
[bullseye] - libvirt <no-dsa> (Minor issue)
[stretch] - libvirt <no-dsa> (Minor issue)
https://bugzilla.redhat.com/show_bug.cgi?id=2024326
Fixed by: https://github.com/libvirt/libvirt/commit/1ac703a7d0789e46833f4013a3876c2e3af18ec7 (v7.1.0-rc2)