CVE-2022-0934 Use after free in dnsmasq
High 7.5
Published
Updated
Check this codebase for CVE-2022-0934 and fix it if it is affected.
What it is: CVE-2022-0934 is a high-severity use after free vulnerability in Redhat Enterprise Linux, published on 29 Aug 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2022-0934 in the wild and no public exploit code.
Affected product: Redhat Enterprise Linux. No package-level version data is available, so check the vendor advisory linked from the reference page.
Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.
Reference: https://insights.sbomify.com/CVE-2022-0934/ (Markdown: https://insights.sbomify.com/CVE-2022-0934/index.md)
An attacker can cause a denial of service in dnsmasq by sending a crafted packet that triggers a use-after-free flaw.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2022-0934?
CVE-2022-0934 is a high-severity use after free vulnerability in Redhat Enterprise Linux, published on 29 Aug 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-416
Which versions are affected by CVE-2022-0934?
It affects 2 products.
Linux distribution packages (38)
dnsmasq AlmaLinux:8 | All versions | 2.79-24.el8 |
dnsmasq-utils AlmaLinux:8 | All versions | 2.79-24.el8 |
dnsmasq AlmaLinux:9 | All versions | 2.85-5.el9 |
dnsmasq-utils AlmaLinux:9 | All versions | 2.85-5.el9 |
dnsmasq Red Hat:enterprise_linux:8::appstream | All versions | 0:2.79-24.el8 |
dnsmasq-debuginfo Red Hat:enterprise_linux:8::appstream | All versions | 0:2.79-24.el8 |
dnsmasq-debugsource Red Hat:enterprise_linux:8::appstream | All versions | 0:2.79-24.el8 |
dnsmasq-utils Red Hat:enterprise_linux:8::appstream | All versions | 0:2.79-24.el8 |
dnsmasq-utils-debuginfo Red Hat:enterprise_linux:8::appstream | All versions | 0:2.79-24.el8 |
dnsmasq Red Hat:enterprise_linux:9::appstream | All versions | 0:2.85-5.el9 |
dnsmasq-debuginfo Red Hat:enterprise_linux:9::appstream | All versions | 0:2.85-5.el9 |
dnsmasq-debugsource Red Hat:enterprise_linux:9::appstream | All versions | 0:2.85-5.el9 |
dnsmasq-utils Red Hat:enterprise_linux:9::appstream | All versions | 0:2.85-5.el9 |
dnsmasq-utils-debuginfo Red Hat:enterprise_linux:9::appstream | All versions | 0:2.85-5.el9 |
dnsmasq Rocky Linux:8 | All versions | 0:2.79-24.el8 |
dnsmasq Rocky Linux:9 | All versions | 0:2.85-5.el9 |
dnsmasq SUSE:Enterprise Storage 6 | All versions | 2.86-150100.7.20.1 |
dnsmasq SUSE:Enterprise Storage 7 | All versions | 2.86-150100.7.20.1 |
dnsmasq SUSE:Linux Enterprise High Performance Computing 15 SP1-ESPOS | All versions | 2.86-150100.7.20.1 |
dnsmasq SUSE:Linux Enterprise High Performance Computing 15 SP1-LTSS | All versions | 2.86-150100.7.20.1 |
dnsmasq SUSE:Linux Enterprise High Performance Computing 15 SP2-ESPOS | All versions | 2.86-150100.7.20.1 |
dnsmasq SUSE:Linux Enterprise High Performance Computing 15 SP2-LTSS | All versions | 2.86-150100.7.20.1 |
dnsmasq SUSE:Linux Enterprise Micro 5.0 | All versions | 2.86-150100.7.20.1 |
dnsmasq SUSE:Linux Enterprise Micro 5.1 | All versions | 2.86-150100.7.20.1 |
dnsmasq SUSE:Linux Enterprise Micro 5.2 | All versions | 2.86-150100.7.20.1 |
dnsmasq SUSE:Linux Enterprise Module for Basesystem 15 SP3 | All versions | 2.86-150100.7.20.1 |
dnsmasq SUSE:Linux Enterprise Real Time 15 SP2 | All versions | 2.86-150100.7.20.1 |
dnsmasq SUSE:Linux Enterprise Server 15 SP1-BCL | All versions | 2.86-150100.7.20.1 |
dnsmasq SUSE:Linux Enterprise Server 15 SP1-LTSS | All versions | 2.86-150100.7.20.1 |
dnsmasq SUSE:Linux Enterprise Server 15 SP2-BCL | All versions | 2.86-150100.7.20.1 |
dnsmasq SUSE:Linux Enterprise Server 15 SP2-LTSS | All versions | 2.86-150100.7.20.1 |
dnsmasq SUSE:Linux Enterprise Server for SAP Applications 15 SP1 | All versions | 2.86-150100.7.20.1 |
dnsmasq SUSE:Linux Enterprise Server for SAP Applications 15 SP2 | All versions | 2.86-150100.7.20.1 |
dnsmasq SUSE:Manager Proxy 4.1 | All versions | 2.86-150100.7.20.1 |
dnsmasq SUSE:Manager Retail Branch Server 4.1 | All versions | 2.86-150100.7.20.1 |
dnsmasq SUSE:Manager Server 4.1 | All versions | 2.86-150100.7.20.1 |
dnsmasq openSUSE:Leap 15.3 | All versions | 2.86-150100.7.20.1 |
dnsmasq openSUSE:Tumbleweed | All versions | 2.86-4.1 |
Products include Redhat Enterprise Linux, Thekelleys Dnsmasq.
How do I fix CVE-2022-0934?
Apply the vendor's patch.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2022-0934 being exploited?
There is no known exploitation of CVE-2022-0934 in the wild and no public exploit code.
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Sources
Also known as ALPINE-CVE-2022-0934, ALSA-2022:7633, ALSA-2022:8070, AZL-25317, CLEANSTART-2026-LH68437, CLSA-2026-1778157268 and 12 more.