6

CVE-2021-4158: qemu NULL Pointer Dereference

Modified
AliasesUBUNTU-CVE-2021-4158DEBIAN-CVE-2021-4158openSUSE-SU-2024:11862-1
Published 24-08-2022Last modified 03-08-2024

Vulnerability summary

CVE-2021-4158 is a medium (CVSS 6.0) NULL Pointer Dereference vulnerability in qemu. EPSS estimates a 0.40% chance of exploitation in the next 30 days, higher than 34.2% of scored vulnerabilities. 1 public exploit is recorded.

Priority
Routine

Not severe (CVSS 6, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
6.0/10
010
Medium · v3.1 (NVD)
EPSS score
0.40%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits1reference

Advisory lineage

Upstream 0 · Downstream 3 · Related 1
RHSA-2022:1759RHSA-2022:7967USN-5307-1

Timeline

  1. 24-08-2022
    PublishedVulnerability first disclosed.
  2. 03-08-2024
    Last modifiedVulnerability information updated.

Description

A NULL pointer dereference issue was found in the ACPI code of QEMU. A malicious, privileged user within the guest could use this flaw to crash the QEMU process on the host, resulting in a denial of service condition.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.40%

Chance of exploitation in the next 30 days

Percentile

34%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.40% 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

1 found
  • referenceUnverified

    Exploit Reference (gitlab.com)

    Maturity: unknown

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: local access, administrative account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Alpine1 product
  • qemu≥ 6.0.0, < 7.0.0-r0
Debian1 product
  • qemu< 1:6.2+dfsg-2
Opensuse1 product
  • qemu&distro=openSUSE Tumbleweed< 6.2.0-40.1
Qemu1 product
  • qemu≥ 6.0.0, < 7.0.0
Redhat1 product
Ubuntu1 product
  • qemu< 1:6.2+dfsg-2ubuntu5

6 vendors · 6 products

References

14 links
Show all 14 references