Description
A vulnerability stemming from failure to properly clean up closed OMAPI connections can lead to exhaustion of the pool of socket descriptors available to the DHCP server. Affects ISC DHCP 4.1.0 to 4.1-ESV-R15, 4.2.0 to 4.2.8, 4.3.0 to 4.3.6. Older versions may also be affected but are well beyond their end-of-life (EOL). Releases prior to 4.1.0 have not been tested.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| ISC | ISC DHCP | ISC DHCP 4.1.0 to 4.1-ESV-R15, 4.2.0 to 4.2.8, 4.3.0 to 4.3.6. Older versions may also be affected but are well beyond their end-of-life (EOL). Releases prior to 4.1.0 have not been tested. | — |
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 13 | isc-dhcp | 4.3.5-3.1 | — |
| Debian 12 | isc-dhcp | 4.3.5-3.1 | — |
| Debian 9 | isc-dhcp | 4.3.5-3+deb9u1 | DSA-4133-1 |
| Debian 8 | isc-dhcp | 4.3.1-6+deb8u3 | DSA-4133-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | isc-dhcp | 4.3.5-3ubuntu5 | — |
| Ubuntu 16.04 LTS | isc-dhcp | 4.3.3-5ubuntu12.9 | USN-3586-1 |
| Ubuntu 14.04 LTS | isc-dhcp | 4.2.4-7ubuntu12.12 | USN-3586-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 7 | dhcp +4 | 12:4.2.5-58.el7_4.1 | RHSA-2018:0158 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP3 | dhcp | 4.3.3-10.11.1 | SUSE-SU-2018:0532-1 |
| SLES 12 SP2 | dhcp | 4.3.3-10.11.1 | SUSE-SU-2018:0532-1 |
| SLES 11 SP4 | dhcp | 4.2.4.P2-0.28.5.3 | SUSE-SU-2018:0444-1 |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 12 SP3 | dhcp | 4.3.3-10.11.1 | SUSE-SU-2018:0532-1 |
| SLES for SAP 12 SP2 | dhcp | 4.3.3-10.11.1 | SUSE-SU-2018:0532-1 |
| SLES for SAP 11 SP4 | dhcp | 4.2.4.P2-0.28.5.3 | SUSE-SU-2018:0444-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | dhcp | 4.4.2.P1-2.4 | openSUSE-SU-2024:10715-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | dhcp +4 | 12:4.2.5-58.amzn2.1.2 | ALAS2-2018-963 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 7 | dhcp +4 | 12:4.2.5-58.0.1.el7_4.1 | ELSA-2018-0158 |
Advisories 8
- RHSA-2018:0158 Red Hat Security Advisory: dhcp security update Red Hat Security Advisories (RHSA) · Jul 1, 2026
- USN-3586-1 isc-dhcp vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DSA-4133-1 isc-dhcp - security update Debian Security (DSA / DLA) · Mar 9, 2026
- openSUSE-SU-2024:10715-1 dhcp-4.4.2.P1-2.4 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2018:0532-1 Security update for dhcp SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2018:0444-1 Security update for dhcp SUSE / openSUSE Security Updates · May 2, 2025
- ALAS2-2018-963 Moderate: dhcp security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Feb 21, 2018
- ELSA-2018-0158 Moderate: dhcp security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Jan 25, 2018
References
- RHSA-2018:0158 vendor-advisory
- DSA-4133 vendor-advisory
- 102726 vdb-entry
- 1040194 vdb-entry
- USN-3586-1 vendor-advisory
- https://kb.isc.org/docs/aa-01541