CVE-2022-0934

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 2.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2022-08-29 · updated 2026-06-17
Weakness: CWE-416

Description

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.

Affected products

Red Hat Enterprise Linux: 8.0, 9.0
Simon Kelley dnsmasq: before 2.87 — fixed in 2.87

How to fix

Upgrade to a fixed version: Simon Kelley dnsmasq 2.87. Check the vendor advisory for mitigations.

References

https://access.redhat.com/security/cve/CVE-2022-0934
https://bugzilla.redhat.com/show_bug.cgi?id=2057075
https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2022q1/016272.html
https://thekelleys.org.uk/gitweb/?p=dnsmasq.git%3Ba=commit%3Bh=03345ecefeb0d82e3c3a4c28f27c3554f0611b39
https://access.redhat.com/security/cve/CVE-2022-0934
https://bugzilla.redhat.com/show_bug.cgi?id=2057075
https://lists.debian.org/debian-lts-announce/2024/11/msg00035.html
https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2022q1/016272.html
https://thekelleys.org.uk/gitweb/?p=dnsmasq.git%3Ba=commit%3Bh=03345ecefeb0d82e3c3a4c28f27c3554f0611b39

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