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Fencer Vulns
high 7.5

CVE-2022-0934 json

A single-byte, non-arbitrary write/use-after-free flaw was found in dnsmasq.

published 2022-08-29 4 y ago modified 2026-06-17 4 mo ago also EUVD-2022-15955

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
2.6%
EPSS 2.6% chance of exploitation in 30 days, percentile 85%
public exploits
0
none known

Summary

A single-byte, non-arbitrary write/use-after-free flaw was found in dnsmasq. This flaw allows an attacker who sends a crafted packet processed by dnsmasq, potentially causing a denial of service.

Patch / fix

  • thekelleys dnsmasq 2.87
  • dnsmasq Debian 14, Debian 13, Debian 12 2.87-1

debian advisories DEBIAN-CVE-2022-0934

  • dnsmasq Ubuntu 18.04 LTS 2.79-1ubuntu0.6
  • dnsmasq Ubuntu 20.04 LTS 2.80-1.1ubuntu1.5
  • dnsmasq Ubuntu 22.04 LTS 2.86-1.1ubuntu0.1
  • dnsmasq Ubuntu Pro 14.04 LTS 2.68-1ubuntu0.2+esm1
  • dnsmasq Ubuntu Pro 16.04 LTS 2.75-1ubuntu0.16.04.10+esm1

ubuntu advisories UBUNTU-CVE-2022-0934

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

  • dnsmasq RHEL 9 2.85-5.el9
  • dnsmasq-utils RHEL 9 2.85-5.el9
  • dnsmasq RHEL 8 2.79-24.el8
  • dnsmasq-utils RHEL 8 2.79-24.el8
  • dnsmasq RHEL 8.6 EUS 2.79-21.el8_6.5
  • dnsmasq-utils RHEL 8.6 EUS 2.79-21.el8_6.5

red hat advisories RHSA-2024:1545RHSA-2022:8070RHSA-2022:7633

  • dnsmasq SLES for SAP 15 SP2, SLES for SAP 15 SP1, SLES 15 SP2-LTSS +18 more 2.86-150100.7.20.1
  • dnsmasq SLE Point of Sale 11 SP3 2.78-0.16.17.1
  • dnsmasq SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLES for SAP 12 SP3 +10 more 2.78-18.18.1
  • dnsmasq SLES for SAP 15, SLES 15-LTSS, SLE High Performance Computing 15-LTSS +1 more 2.78-150000.3.14.1
  • dnsmasq SLES 11 SP4-LTSS 2.78-0.17.18.1

suse advisories SUSE-SU-2022:1307-1SUSE-SU-2022:14941-1SUSE-SU-2022:14940-1SUSE-SU-2022:1289-1SUSE-SU-2022:1288-1

  • dnsmasq openSUSE Tumbleweed 2.86-4.1

opensuse advisories openSUSE-SU-2024:11998-1

  • dnsmasq AlmaLinux 9 2.85-5.el9
  • dnsmasq-utils AlmaLinux 9 2.85-5.el9
  • dnsmasq AlmaLinux 8 2.79-24.el8
  • dnsmasq-utils AlmaLinux 8 2.79-24.el8

almalinux advisories ALSA-2022:8070ALSA-2022:7633

  • dnsmasq Rocky Linux 9 2.85-5.el9
  • dnsmasq Rocky Linux 8 2.79-24.el8

rocky linux advisories RLSA-2022:8070RLSA-2022:7633

  • dnsmasq Alpine 3.24, Alpine 3.23, Alpine 3.22 +7 more 2.86-r1

alpine advisories ALPINE-CVE-2022-0934

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • dnsmasq CBL-Mariner 2.0 2.89-1

azure linux advisories AZL-25317

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

  • dnsmasq Arch Linux 2.87-1

arch linux advisories AVG-2716

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-2022-0934 updated cvss 7.5

dnsmasq: Heap use after free in dhcp6_no_relay

  • Red Hat Enterprise Linux 6 dnsmasq, dnsmasq-utils Red Hat Enterprise Linux 7 dnsmasq, dnsmasq-utils Red Hat OpenStack Platform 13 (Queens) dnsmasq-utils
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux AppStream (v. 8) dnsmasq 2.79-24.el8, dnsmasq-utils 2.79-24.el8
    fixed: vendor fix RHSA-2022:7633
  • Red Hat Enterprise Linux AppStream (v. 9) dnsmasq 2.85-5.el9, dnsmasq-utils 2.85-5.el9
    fixed: vendor fix RHSA-2022:8070
  • Red Hat Enterprise Linux AppStream EUS (v.8.6) dnsmasq 2.79-21.el8_6.5, dnsmasq-utils 2.79-21.el8_6.5
    fixed: vendor fix RHSA-2024:1545

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
yes
Technical impact
partial
Assessed
16 mo ago

Exploit prediction

2.64% chance of exploitation in the next 30 days, higher than 85% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

  • n/a dnsmasq

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.