CVE-2026-4892

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Summary

CVECVE-2026-4892
StatePUBLISHED
Assignercertcc
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-11 18:16:41 UTC
Updated2026-07-02 12:17:31 UTC
DescriptionA 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.

Risk And Classification

Primary CVSS: v3.1 8.4 HIGH from ADP

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.008120000 probability, percentile 0.525040000 (date 2026-07-04)

Problem Types: CWE-122 | CWE-122: Heap-based Buffer Overflow | CWE-122 Heap-based Buffer Overflow

VersionSourceTypeScoreSeverityVector
3.1ADPDECLARED8.4HIGHCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1ADPCVSS8.8HIGHCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary8.4HIGHCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.10b0ca135-0b70-47e7-9f44-1890c2a1c46cSecondary8.8HIGHCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Dnsmasq Dnsmasq affected 2.92rel2 custom Not specified
ADP Red Hat Red Hat Enterprise Linux AppStream V. 10 Not specified Not specified
ADP Red Hat Red Hat Enterprise Linux AppStream V. 8 Not specified Not specified
ADP Red Hat Red Hat Enterprise Linux AppStream EUS V.9.6 Not specified Not specified
ADP Red Hat Red Hat Enterprise Linux AppStream V. 9 Not specified Not specified
ADP Red Hat Red Hat Enterprise Linux 6 Not specified Not specified
ADP Red Hat Red Hat Enterprise Linux 7 Not specified Not specified
ADP Red Hat Red Hat OpenShift Container Platform 4 Not specified Not specified

References

ReferenceSourceLinkTags
access.redhat.com/errata/RHSA-2026:34508 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
access.redhat.com/security/cve/CVE-2026-4892 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
access.redhat.com/errata/RHSA-2026:19373 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
bugzilla.redhat.com/show_bug.cgi 0b0ca135-0b70-47e7-9f44-1890c2a1c46c bugzilla.redhat.com
github.com/NixOS/nixpkgs/pull/519093 [email protected] github.com
www.kb.cert.org/vuls/id/471747 [email protected] www.kb.cert.org
thekelleys.org.uk/dnsmasq/CVE [email protected] thekelleys.org.uk
access.redhat.com/errata/RHSA-2026:20589 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
access.redhat.com/errata/RHSA-2026:19158 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
github.com/NixOS/nixpkgs/pull/519082 [email protected] github.com
lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2026q2/018471.html [email protected] lists.thekelleys.org.uk
github.com/pi-hole/FTL/releases/tag/v6.6.2 [email protected] github.com
security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-4892.json 0b0ca135-0b70-47e7-9f44-1890c2a1c46c security.access.redhat.com
thekelleys.org.uk/dnsmasq MITRE thekelleys.org.uk
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Additional Advisory Data

SourceTimeEvent
ADP2026-04-14T22:44:58.432ZReported to Red Hat.
ADP2026-05-09T00:00:00.000ZMade public.

Solutions

ADP: RHSA-2026:19158: Red Hat Enterprise Linux AppStream (v. 10)

ADP: RHSA-2026:20589: Red Hat Enterprise Linux AppStream (v. 8)

ADP: RHSA-2026:34508: Red Hat Enterprise Linux AppStream EUS (v.9.6)

ADP: RHSA-2026:19373: Red Hat Enterprise Linux AppStream (v. 9)

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