CVE-2026-4893
Publication date 11 May 2026
Last updated 13 May 2026
Ubuntu priority
Description
An information disclosure vulnerability in dnsmasq allows remote attackers to bypass source checks via a crafted DNS packet with RFC 7871 client subnet information.
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| dnsmasq | 26.04 LTS resolute |
Fixed 2.92-1ubuntu0.2
|
| 25.10 questing |
Fixed 2.91-1ubuntu0.2
|
|
| 24.04 LTS noble |
Fixed 2.90-2ubuntu0.3
|
|
| 22.04 LTS jammy |
Fixed 2.90-0ubuntu0.22.04.3
|
|
| 20.04 LTS focal |
Fixed 2.90-0ubuntu0.20.04.1+esm2
|
|
| 18.04 LTS bionic |
Fixed 2.90-0ubuntu0.18.04.1+esm3
|
|
| 16.04 LTS xenial |
Fixed 2.90-0ubuntu0.16.04.1+esm3
|
|
| 14.04 LTS trusty |
Fixed 2.68-1ubuntu0.2+esm5
|
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Get Ubuntu Pro 30-day free trialSeverity score breakdown
| Parameter | Value |
|---|---|
| Base score |
5.3 · Medium
|
| Attack vector | Network |
| Attack complexity | Low |
| Privileges required | None |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality | Low |
| Integrity impact | None |
| Availability impact | None |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N |
References
Related Ubuntu Security Notices (USN)
- USN-8268-1
- Dnsmasq vulnerabilities
- 12 May 2026