CVE-2021-3975

Advisory lineage Upstream: 0 Downstream: 13
Modified
Published: 23 Aug 2022, 00:00
Last modified:03 Aug 2024, 17:09

Vulnerability Summary

Overall Risk (default)
medium
26/100
CVSS Score
6.5 MEDIUM
v3.1 (nvd)
EPSS Score
0.6% LOW
1% probability +0.14%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

23 Aug 2022, 00:00
Published
Vulnerability first disclosed
03 Aug 2024, 17:09
Last Modified
Vulnerability information updated

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.

CVSS Metrics

  • v3.1•MEDIUM•Score: 6.5CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS Trends

Current EPSS score: 0.60%• Percentile: 70%

Techniques & Countermeasures

  • CWE-416•Use After Free

    The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

Affected Systems

  • canonical•ubuntu_linux

    21.10

  • debian•debian_linux

    10.0 | 11.0

  • fedoraproject•fedora

    35

  • netapp•ontap_select_deploy_administration_utility

    na

  • redhat•codeready_linux_builder

    na

  • redhat•enterprise_linux

    8.0

  • redhat•enterprise_linux_eus

    8.6

  • redhat•enterprise_linux_for_ibm_z_systems

    8.0

  • redhat•enterprise_linux_for_ibm_z_systems_eus

    8.6

  • redhat•enterprise_linux_for_power_little_endian

    8.0

  • redhat•enterprise_linux_for_power_little_endian_eus

    8.6

  • redhat•enterprise_linux_server_for_power_little_endian_update_services_for_sap_solutions

    8.6

  • redhat•enterprise_linux_server_tus

    8.6

  • redhat•libvirt

    < 7.1.0

References (6)