Detections
Analytics
Linux Distros Unpatched Vulnerability : CVE-2026-56114
medium Nessus Plugin ID 323650
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Synopsis
The Linux/Unix host has one or more packages installed with a vulnerability that the vendor indicates will not be patched.Description
The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.- dhcpcd through 10.3.2, fixed in commit 2f00c7b, contains a one-byte stack out-of-bounds write vulnerability in dhcp6_makemessage() in src/dhcp6.c that allows unauthenticated same-link attackers to write beyond a fixed local buffer by serializing an oversized RFC6603 OPTION_PD_EXCLUDE option body.
Attackers can send a crafted DHCPv6 ADVERTISE message containing an IA_PD IAPREFIX /0 with a valid OPTION_PD_EXCLUDE using an exclude prefix length of /121 through /128 to trigger the out-of-bounds write and potentially corrupt adjacent stack memory. (CVE-2026-56114)
Note that Nessus relies on the presence of the package as reported by the vendor.
Solution
There is no known solution at this time.See Also
https://access.redhat.com/security/cve/cve-2026-56114
Plugin Details
Severity: Medium
ID: 323650
File Name: unpatched_CVE_2026_56114.nasl
Version: 1.9
Type: Local
Agent: unix
Family: Misc.
Published: 6/29/2026
Updated: 7/16/2026
Supported Sensors: Agentless Assessment, Frictionless Assessment Agent, Frictionless Assessment AWS, Frictionless Assessment Azure, Nessus Agent, Tenable Cloud Security, Tenable Self-Hosted Container Security, Nessus
Risk Information
VPR
Risk Factor: Low
Score: 3
Percentile: 23.72
CVSS v2
Risk Factor: Medium
Base Score: 6.1
Temporal Score: 5.2
Vector: CVSS2#AV:A/AC:L/Au:N/C:N/I:N/A:C
CVSS Score Source: CVE-2026-56114
CVSS v3
Risk Factor: Medium
Base Score: 6.5
Temporal Score: 6
Vector: CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Temporal Vector: CVSS:3.0/E:U/RL:U/RC:C
CVSS v4
Risk Factor: Medium
Base Score: 6
Threat Score: 2.3
Threat Vector: CVSS:4.0/E:U
Vector: CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Vulnerability Information
CPE: p-cpe:/a:redhat:enterprise_linux:dhcpcd, cpe:/o:debian:debian_linux:11.0, cpe:/o:canonical:ubuntu_linux:25.10, cpe:/o:canonical:ubuntu_linux:24.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:dhcpcd, p-cpe:/a:debian:debian_linux:dhcpcd5, cpe:/o:redhat:enterprise_linux:10, cpe:/o:canonical:ubuntu_linux:26.04:-:lts
Required KB Items: Host/cpu, Host/local_checks_enabled, global_settings/vendor_unpatched, Host/OS/identifier
Exploit Ease: No known exploits are available
Vulnerability Publication Date: 6/23/2026
Reference Information
CVE: CVE-2026-56114