CVE-2026-4892
8.4
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
A heap-based out-of-bounds write vulnerability in the DHCPv6 implementation of dnsmasq allows local attackers to execute arbitrary code with root privileges via a crafted DHCPv6 packet.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| dnsmasq | dnsmasq | 0 < 2.92rel2 | affected |
Weaknesses
- CWE-122: Heap-based Buffer Overflow
ADP Enrichment
CISA ADP Vulnrichment
- SSVC:
- Exploitation: none
- Automatable: no
- Technical Impact: total
dnsmasq: DHCPv6 CLID buffer overflow in helper process
Additional References
- https://access.redhat.com/security/cve/CVE-2026-4892
- https://bugzilla.redhat.com/show_bug.cgi?id=2458518
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-4892.json
- https://access.redhat.com/errata/RHSA-2026:19158
- https://access.redhat.com/errata/RHSA-2026:20589
- https://access.redhat.com/errata/RHSA-2026:34508
- https://access.redhat.com/errata/RHSA-2026:19373
References
- https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2026q2/018471.html
- https://www.kb.cert.org/vuls/id/471747
- https://thekelleys.org.uk/dnsmasq/CVE/
- https://github.com/NixOS/nixpkgs/pull/519082
- https://github.com/NixOS/nixpkgs/pull/519093
- https://github.com/pi-hole/FTL/releases/tag/v6.6.2
Feedback
Was this page helpful?
Glad to hear it! Please tell us how we can improve.
Sorry to hear that. Please tell us how we can improve.