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Fencer Vulns
medium 4.3

CVE-2022-0897 json

A flaw was found in the libvirt nwfilter driver.

published 2022-03-25 4 y ago modified 2026-06-17 4 mo ago also EUVD-2022-15929

cvss
4.3
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.0%
EPSS 1.0% chance of exploitation in 30 days, percentile 64%
public exploits
0
none known

Summary

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).

Patch / fix

  • libvirt Debian 14, Debian 13, Debian 12 8.2.0-1

debian advisories DEBIAN-CVE-2022-0897

  • libvirt Ubuntu 18.04 LTS 4.0.0-1ubuntu8.21
  • libvirt Ubuntu 20.04 LTS 6.0.0-0ubuntu8.16
  • libvirt Ubuntu 22.04 LTS 8.0.0-1ubuntu7.5

ubuntu advisories UBUNTU-CVE-2022-0897

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • SLOF RHEL 8 20210217-1.module+el8.7.0+16689+53d59bc2
  • hivex RHEL 8 1.3.18-23.module+el8.7.0+16689+53d59bc2
  • netcf RHEL 8 0.2.8-12.module+el8.7.0+16689+53d59bc2
  • swtpm RHEL 8 0.7.0-4.20211109gitb79fd91.module+el8.7.0+16689+53d59bc2
  • libnbd RHEL 8 1.6.0-5.module+el8.7.0+16689+53d59bc2
  • nbdkit RHEL 8 1.24.0-4.module+el8.7.0+16689+53d59bc2
  • libtpms RHEL 8 0.9.1-1.20211126git1ff6fe1f43.module+el8.7.0+16689+53d59bc2
  • libvirt RHEL 8 8.0.0-10.module+el8.7.0+16689+53d59bc2

red hat advisories RHSA-2022:7472RHSA-2022:8003

  • libvirt SLES for SAP 15 SP2, SLES 15 SP2-LTSS, SLE High Performance Computing 15 SP2-LTSS +1 more 6.0.0-150200.13.27.1
  • libvirt SLE Module for Server Applications 15 SP3, SLE Module for Basesystem 15 SP3, SLE Micro 5.2 +3 more 7.1.0-150300.6.29.1
  • libvirt SLES for SAP 12 SP5, SLES 12 SP5, SLE Software Development Kit 12 SP5 5.1.0-13.31.1

suse advisories SUSE-SU-2023:2754-1SUSE-SU-2022:1549-1SUSE-SU-2022:1540-1

  • libvirt openSUSE Tumbleweed 8.2.0-1.1

opensuse advisories openSUSE-SU-2024:11972-1

  • libvirt AlmaLinux 9 8.5.0-7.el9_1
  • libvirt-nss AlmaLinux 9 8.5.0-7.el9_1
  • libvirt-libs AlmaLinux 9 8.5.0-7.el9_1
  • libvirt-client AlmaLinux 9 8.5.0-7.el9_1
  • libvirt-daemon AlmaLinux 9 8.5.0-7.el9_1
  • libvirt-daemon-kvm AlmaLinux 9 8.5.0-7.el9_1
  • libvirt-lock-sanlock AlmaLinux 9 8.5.0-7.el9_1
  • libvirt-daemon-driver-qemu AlmaLinux 9 8.5.0-7.el9_1

almalinux advisories ALSA-2022:8003

  • libvirt Rocky Linux 9 8.5.0-7.3.el9_1
  • hivex Rocky Linux 8 1.3.18-23.module+el8.7.0+1084+97b81f61
  • hivex Rocky Linux 8 1.3.18-23.module+el8.6.0+847+b490afdd
  • netcf Rocky Linux 8 0.2.8-12.module+el8.7.0+1084+97b81f61
  • netcf Rocky Linux 8 0.2.8-12.module+el8.4.0+534+4680a14e
  • netcf Rocky Linux 8 0.2.8-12.module+el8.6.0+847+b490afdd
  • swtpm Rocky Linux 8 0.7.0-4.20211109gitb79fd91.module+el8.7.0+1084+97b81f61
  • libnbd Rocky Linux 8 1.6.0-5.module+el8.7.0+1084+97b81f61

rocky linux advisories RLSA-2022:8003RLSA-2022:7472

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2022-0897 updated cvss 5.0

libvirt: missing locking in nwfilterConnectNumOfNWFilters can lead to denial of service

  • Red Hat Enterprise Linux 6 libvirt, libvirt-client, libvirt-python, libvirt-lock-sanlock Red Hat Enterprise Linux 7 libvirt, libvirt-nss, libvirt-libs, libvirt-admin, libvirt-client, libvirt-daemon, +24 more
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 8 Advanced Virtualization libvirt, libvirt-nss, libvirt-libs, libvirt-admin, libvirt-client, libvirt-daemon, +22 more
    affected: no fix available “Fix deferred”
  • Red Hat CodeReady Linux Builder (v. 8) libnbd 1.6.0-5.module+el8.7.0+16689+53d59bc2, netcf 0.2.8-12.module+el8.7.0+16689+53d59bc2, hivex 1.3.18-23.module+el8.7.0+16689+53d59bc2, nbdfuse 1.6.0-5.module+el8.7.0+16689+53d59bc2, SLOF 20210217-1.module+el8.7.0+16689+53d59bc2, libvirt 8.0.0-10.module+el8.7.0+16689+53d59bc2, +38 more
    fixed: vendor fix RHSA-2022:7472
  • Red Hat CodeReady Linux Builder (v. 9) libvirt-lock-sanlock 8.5.0-7.el9_1
    fixed: vendor fix RHSA-2022:8003
  • Red Hat Enterprise Linux AppStream (v. 8) libnbd 1.6.0-5.module+el8.7.0+16689+53d59bc2, netcf 0.2.8-12.module+el8.7.0+16689+53d59bc2, hivex 1.3.18-23.module+el8.7.0+16689+53d59bc2, nbdfuse 1.6.0-5.module+el8.7.0+16689+53d59bc2, nbdkit 1.24.0-4.module+el8.7.0+16689+53d59bc2, SLOF 20210217-1.module+el8.7.0+16689+53d59bc2, +104 more
    fixed: vendor fix RHSA-2022:7472
  • Red Hat Enterprise Linux AppStream (v. 9) libvirt 8.5.0-7.el9_1, libvirt-nss 8.5.0-7.el9_1, libvirt-libs 8.5.0-7.el9_1, libvirt-client 8.5.0-7.el9_1, libvirt-daemon 8.5.0-7.el9_1, libvirt-daemon-kvm 8.5.0-7.el9_1, +16 more
    fixed: vendor fix RHSA-2022:8003

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
2 y ago

Exploit prediction

1.05% chance of exploitation in the next 30 days, higher than 64% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 4.3 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
NVD 2.0 4.0 AV:N/AC:L/Au:S/C:N/I:N/A:P

Affected products

  • n/a libvirt

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.