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openSUSE 16 Security Update : dhcpcd (openSUSE-SU-2026:21692-1)

high Nessus Plugin ID 342110

Synopsis

The remote openSUSE host is missing one or more security updates.

Description

The remote openSUSE 16 host has a package installed that is affected by multiple vulnerabilities as referenced in the openSUSE-SU-2026:21692-1 advisory.

 Update to 10.5.0.

 Security issues fixed:

 - CVE-2026-56113: crafted DHCPv6 RENEW reply can lead to a denial of service (bsc#1268980).
 - CVE-2026-56115: crafted DHCPv6 ADVERTISE message can cause a one-byte stack out-of-bounds write (bsc#1268976).
 - CVE-2026-56116: crafted Router Advertisements containing Route Information options with a zero lifetime can lead to a memory leak (bsc#1268974).
 - CVE-2026-56117: crafted privileged command sent over a writable control socket can lead to a heap use- after-free (bsc#1268968).

 Changes for dhcpcd:

 - 10.5.0:
 * Add missing SPDX-License tags
 * Format code with clang-format v19
 * privsep: Change IPC to use SOCK_STREAM
 * BPF: Split OS specific code out into own files and add libpcap support
 * hooks: Escape interface names and use printf
 * Delete DHCPv6 IA FD from the loop before closing it
 * eloop: Use kqueue or epoll to wait for a fd to become ready
 * Darwin: Add initial support for macOS
 * Import latest pidfile from NetBSD
 * BPF: Improve headers
 * compat: Add support for getprogname(3)
 * route: Rework rt structure so sockaddrs are pointers
 * dhcp-common: Escape ifname for lease file
 * privsep: smaller buffer size without INET6
 * script: add ifxname as the escaped string
 * time.h always pulls in struct timespec
 * route: Use HAVE_RT_MISSFILTER rather than a generic BSD define
 * privsep: Test defines for all ioctls
 * if: if_init inits the interface from the kernel
 * privsep: Add ps_root_gethostname
 * DHCP: Don't really expire the lease when testing
 * DHCP: Don't add a trailing : on vendor if no machine arch
 * privsep: guard setproctitle and only use compat on linux
 * options: Remove some const to fix compile warnings
 * privsep: Don't open PF_INET socket for each ioctl
 * sun: Enable building for privsep
 * script: Use correct buffer length variable
 * privsep: Remove PS_BUFLEN
 * privsep: Simplify readerror
 * timezone: disallow directory traversal
 * privsep: ps_root_readfile should return the real file size
 * linux: Ensure NLA data boundaries are valid
 * options: Fix userclass boundary
 * ND6: fix OOB reject mask for an undefined option.
 * DHCP6: Ensure IA_PD Prefix Lenth is valid
 * ND: Enforce require and reject policy
 * ARP: check we have enough to read the frame header
 * hooks: Quote assignment of compat vars correctly
 * udev: Ensure we have a subsystem, action and ifname
 * Fix CI build
 * DHCP: Santize messages from servers for output
 * ARP: Iterate over states safely as the cb could remove ours
 * privsep: Check data is terminated when a string
 * auth: clear keys with memset_explicit
 * auth: Ensure remaining dlen matches hash digest length
 * hooks: don't read past truncated ip6 address starting fe
 * ipv6: Only regen temp addrs with sufficent pltime
 * eloop: Improve timespecdiff
 * eloop: Fix compile warning where UTIME_MAX is a calculation
 * vsio: Allow zero length options
 * DHCP6: Fix configuring the suffix to delegated prefixes
 * IPv6: Fix numerous issues extending temporary address times
 * capsicum: Avoid some overflow issues in privsep sysctl
 * script: Fix buffer over and under flows in script_buftoenv
 * IPv4: uset old_ia when adding an address causes early removal
 * dhcp: add configurable backoff parameters for DHCPv4
 * options: Introdce policy groups
 * Build all the targets on macos
 * control: remove unprivileged socket
 * DHCP: deconfigure even when state is NULL or NONE

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Solution

Update the affected dhcpcd package.

See Also

https://bugzilla.suse.com/1268968

https://bugzilla.suse.com/1268974

https://bugzilla.suse.com/1268976

https://bugzilla.suse.com/1268980

https://www.suse.com/security/cve/CVE-2026-56113

https://www.suse.com/security/cve/CVE-2026-56115

https://www.suse.com/security/cve/CVE-2026-56116

https://www.suse.com/security/cve/CVE-2026-56117

Plugin Details

Severity: High

ID: 342110

File Name: openSUSE-2026-21692-1.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 9/1/2026

Updated: 9/1/2026

Supported Sensors: Continuous 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: Medium

Score: 4.9

Percentile: 58.02

CVSS v2

Risk Factor: Medium

Base Score: 6.1

Temporal Score: 4.8

Vector: CVSS2#AV:A/AC:L/Au:N/C:N/I:N/A:C

CVSS Score Source: CVE-2026-56113

CVSS v3

Risk Factor: Medium

Base Score: 6.5

Temporal Score: 5.9

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:P/RL:O/RC:C

CVSS v4

Risk Factor: High

Base Score: 8.7

Threat Score: 7.4

Threat Vector: CVSS:4.0/E:P

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS Score Source: CVE-2026-56115

Vulnerability Information

CPE: cpe:/o:novell:opensuse:16.0, p-cpe:/a:novell:opensuse:dhcpcd

Required KB Items: Host/local_checks_enabled, Host/cpu, Host/SuSE/release, Host/SuSE/rpm-list

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 8/30/2026

Vulnerability Publication Date: 6/23/2026

Reference Information

CVE: CVE-2026-56113, CVE-2026-56115, CVE-2026-56116, CVE-2026-56117