Use after free in dnsmasq
Priority MEDIUM 44CWE-416Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Partial Red Hat: 3 fixed, 3 without a fix
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA and Red Hat. Impact type from CWE-416 and the CVSS impact.
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.02644 85th percentileScored 2026-11-07
Fix Partial Red Hat: 3 advisoriesRed Hat: 3 fixed, 3 without a fix
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | dnsmasq | Not-Known | — | No fix listed | CNA |
- dnsmasq Vendor— Affected Not-Known Fixed in — No fix listed CNA
CPE configurations NVD · 3
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:thekelleys:dnsmasq:*:*:*:*:*:*:*:* | before 2.87 | Vulnerable | Thekelleys |
| cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:* | 8.0 | Vulnerable | Red Hat |
| cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:* | 9.0 | Vulnerable | Red Hat |
- cpe:2.3:a:thekelleys:dnsmasq:*:*:*:*:*:*:*:* Versions before 2.87 Vulnerable ·Thekelleys
- cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:* Versions 8.0 Vulnerable ·Red Hat
- cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:* Versions 9.0 Vulnerable ·Red Hat
Remediation
Red Hat 3 advisories
- RHSA-2024:1545 Released 2024-03-27 · Red Hat rating Importantdnsmasq security update
- Red Hat Enterprise Linux AppStream EUS (v.8.6) dnsmasq-2.79-21.el8_6.5, dnsmasq-utils-2.79-21.el8_6.5
- RHSA-2022:8070 Released 2022-11-15 · Red Hat rating Moderatednsmasq security and bug fix update
- Red Hat Enterprise Linux AppStream (v. 9) dnsmasq-2.85-5.el9, dnsmasq-utils-2.85-5.el9
- RHSA-2022:7633 Released 2022-11-08 · Red Hat rating Moderatednsmasq security and bug fix update
- Red Hat Enterprise Linux AppStream (v. 8) dnsmasq-2.79-24.el8, dnsmasq-utils-2.79-24.el8
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 6 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux 7 | Affected | No fix planned: Out of support scope |
| Red Hat OpenStack Platform 13 (Queens) | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux AppStream (v. 8) | Fixed | RHSA-2022:7633 |
| Red Hat Enterprise Linux AppStream (v. 9) | Fixed | RHSA-2022:8070 |
| Red Hat Enterprise Linux AppStream EUS (v.8.6) | Fixed | RHSA-2024:1545 |
Timeline
- 2026-10-02 Threatist record created from CVE-2022-0934
- 2026-10-03 Alias added: GHSA-wpmh-x6rm-9p34
References
Advisory 2
Sources
- CVE-2022-0934 · CVE Program
- CVE-2022-0934 · NVD
- FIRST EPSS
- GHSA-wpmh-x6rm-9p34 · GitHub Advisory Database · CC BY 4.0
- CVE-2022-0934 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences