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Security update for dhcpcd

0
Medium
Published: 08/30/2026 (08/30/2026, 14:33:19 UTC)
Source: GCVE Database
Vendor/Project: SUSE Product Security Team
Product: SUSE

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

Technical Details

Gcve Source
db.gcve.eu
Csaf Category
csaf_security_advisory
Csaf Version
2.0
Publisher
SUSE Product Security Team
Advisory Id
openSUSE-SU-2026:21692-1
Cve Count
4
Additional Cves
["CVE-2026-56115","CVE-2026-56116","CVE-2026-56117"]

Threat ID: 6aab495e55bf5e2cf5990aeb

Added to database: 09/17/2026, 01:58:54 UTC

Last updated: 09/17/2026, 01:58:54 UTC

Views: 1

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