Description
A NULL pointer dereference occurs in Roy Marples NetworkConfiguration/dhcpcd 10.3.0 while parsing configuration options. In parse_option() (src/if-options.c:1886), the code performs a member access on a NULL pointer of type 'struct dhcp_opt' when an unexpected/invalid option token or parsing state causes the lookup to yield NULL. The instrumented fuzzing build reports 'runtime error: member access within null pointer of type struct dhcp_opt' and aborts.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | dhcpcd | 1:10.3.1-1 | — |
| Debian 13 | dhcpcd | 1:10.1.0-11+deb13u3 | — |
| Debian 12 | dhcpcd5 | 9.4.1-24~deb12u5 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.04 LTS | dhcpcd | No fix yet | — |
| Ubuntu 25.10 | dhcpcd | No fix yet | — |
| Ubuntu 24.04 LTS | dhcpcd | No fix yet | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 16.0 | dhcpcd | 10.3.2-160000.1.2 | SUSE-SU-2026:22561-1 |
| SLES 16.0 | dhcpcd | 10.3.2-160000.1.2 | SUSE-SU-2026:22561-1 |
| SLE Micro 6.2 | dhcpcd | 10.3.2-160000.1.2 | SUSE-SU-2026:22542-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 16.0 | dhcpcd | 10.3.2-160000.1.2 | openSUSE-SU-2026:21220-1 |
Advisories 4
- WID-SEC-2026-2195 dhcpcd: Schwachstelle ermöglicht Denial of Service BSI CERT-Bund (WID) · Jul 15, 2026
- SUSE-SU-2026:22561-1 Security update for dhcpcd SUSE / openSUSE Security Updates · Jul 15, 2026
- SUSE-SU-2026:22542-1 Security update for dhcpcd SUSE / openSUSE Security Updates · Jul 14, 2026
- openSUSE-SU-2026:21220-1 Security update for dhcpcd SUSE / openSUSE Security Updates · Jul 9, 2026