6.5

CVE-2021-3667: debian debian_linux Improper Locking

Analyzed
AliasesMGASA-2021-0547SUSE-SU-2021:3277-1SUSE-SU-2021:3540-1
Published 02-03-2022Last modified 13-02-2025

Vulnerability summary

CVE-2021-3667 is a medium (CVSS 6.5) Improper Locking vulnerability in debian debian_linux. EPSS estimates a 1.37% chance of exploitation in the next 30 days, higher than 71.8% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 6.5, network access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
6.5/10
010
Medium · v3.1 (NVD)
EPSS score
1.37%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 8 · Related 4
DLA-3778-1OPENSUSE-SU-2021:2812-1OPENSUSE-SU-2024:11008-1RHSA-2021:3703RHSA-2021:3704RHSA-2021:4191

Timeline

  1. 02-03-2022
    PublishedVulnerability first disclosed.
  2. 13-02-2025
    Last modifiedVulnerability information updated.

Description

An improper locking issue was found in the virStoragePoolLookupByTargetPath API of libvirt. It occurs in the storagePoolLookupByTargetPath function where a locked virStoragePoolObj object is not properly released on ACL permission failure. Clients connecting to the read-write socket with limited ACL permissions could use this flaw to acquire the lock and prevent other users from accessing storage pool/volume APIs, resulting in a denial of service condition. The highest threat from this vulnerability is to system availability.

CVSS metrics

4 scores · 3 sources · 2 versions

EPSS trend

Probability

1.37%

Chance of exploitation in the next 30 days

Percentile

72%

Versus all other CVEs

30-day change

No change 0.00 pp

From 1.37% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Suse12 products
  • libvirt&distro=SUSE Enterprise Storage 6< 5.1.0-8.29.1
  • libvirt&distro=SUSE Linux Enterprise High Performance Computing 15 SP1-ESPOS< 5.1.0-8.29.1
  • libvirt&distro=SUSE Linux Enterprise High Performance Computing 15 SP1-LTSS< 5.1.0-8.29.1
  • libvirt&distro=SUSE Linux Enterprise Micro 5.0< 6.0.0-13.21.1
  • libvirt&distro=SUSE Linux Enterprise Module for Basesystem 15 SP2< 6.0.0-13.21.1
Debian2 products
Redhat2 products
Mageia1 product
  • libvirt< 7.0.0-2.2.mga8
Netapp1 product
Opensuse1 product
  • libvirt&distro=openSUSE Leap 15.2< 6.0.0-lp152.9.15.1
Ubuntu1 product
  • libvirt< 6.0.0-0ubuntu8.16 | < 7.6.0-0ubuntu3

7 vendors · 20 products

References

32 links
Show all 32 references