# CVE-2026-56115: dhcpcd: This update for dhcpcd fixes the following issues:  Update to 10.5.0.  Security issues fixed:  - CVE-2026-56113: craf...

CVE-2026-56115 is fixed in dhcpcd on 1 platform, first by OPENSUSE-SU-2026:21692-1, released August 30, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-56115
- Priority: Routine
- CVSS: n/a
- EPSS: 0.0045
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Aug 30, 2026

## Description

This update for dhcpcd fixes the following issues:  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

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | dhcpcd opensuse-leap 16.0 | 10.5.0-160000.1.1 | [OPENSUSE-SU-2026:21692-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21692-1.md) | Aug 30, 2026 |
| Linux | dhcpcd sles 16.0 | 10.5.0-160000.1.1 | [SUSE-SU-2026:23562-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-23562-1.md) | Aug 30, 2026 |

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Data as of 2026-11-10T07:50:38Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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