Red Hat Product Errata RHSA-2026:97486 - Security Advisory
Issued:
2026-11-10
Updated:
2026-11-10

RHSA-2026:97486 - Security Advisory

Synopsis

Low: dhcp security, bug fix, and enhancement update

Type/Severity

Security Advisory: Low

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Topic

An update for dhcp is now available for Red Hat Enterprise Linux 9.

Red Hat Product Security has rated this update as having a security impact of Low. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Description

The Dynamic Host Configuration Protocol (DHCP) is a protocol that allows individual devices on an IP network to get their own network configuration information, including an IP address, a subnet mask, and a broadcast address. The dhcp packages provide a relay agent and ISC DHCP service required to enable and administer DHCP on a network.

Security Fix(es):

  • dhcp-server: dhcp-server: Persistent denial of service due to buffer overflow via OMAPI (CVE-2026-18103)

Bug Fix(es) and Enhancement(s):

  • dhcpd dies constantly with "Error allocating fallback interface: invalid argument" (JIRA:RHEL-151420)
  • Attempt to free pointer that is inside a structure in get_hw_addr2 (JIRA:RHEL-235872)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Additional Changes:

For detailed information on changes in this release, see the Red Hat Enterprise Linux 9 Release Notes linked from the References section.

Solution

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

Affected Products

  • Red Hat Enterprise Linux for x86_64 9 x86_64
  • Red Hat Enterprise Linux for IBM z Systems 9 s390x
  • Red Hat Enterprise Linux for Power, little endian 9 ppc64le
  • Red Hat Enterprise Linux for ARM 64 9 aarch64

Fixes

  • BZ - 2508081 - CVE-2026-18103 dhcp-server: dhcp-server: Persistent denial of service due to buffer overflow via OMAPI

Red Hat Enterprise Linux for x86_64 9

SRPM
dhcp-4.4.2-22.b1.el9.src.rpm SHA-256: 56e99d7bcf9b82c9930072fdabb75c8ba7873bb23f5023d3230c54498281a731
x86_64
dhcp-client-4.4.2-22.b1.el9.x86_64.rpm SHA-256: 9bc4ed76d1d2e7b210aa27f10a0f1cfd5fb3a8c1928c0e8a95893373f13e030f
dhcp-client-debuginfo-4.4.2-22.b1.el9.x86_64.rpm SHA-256: aff57cbd4b833fda1baa24733fba4653f70b6327f7e5edb1290fe1877e63383c
dhcp-common-4.4.2-22.b1.el9.noarch.rpm SHA-256: f1598bc62299b149b3b7d2f9ee0b1d582a2304938fdb41645cf24e7287b91709
dhcp-debuginfo-4.4.2-22.b1.el9.x86_64.rpm SHA-256: e53c780c30db27d5cf0cae7e20ab7f78ecaa92776e38e22d6a0076664841718f
dhcp-debugsource-4.4.2-22.b1.el9.x86_64.rpm SHA-256: 048206a28b374fe6e0fc326059a57206578f34c6319fa9045acb9152f2836988
dhcp-relay-4.4.2-22.b1.el9.x86_64.rpm SHA-256: 3ba67643f37238770fd70768655e587cf9edabfdee8794362be20cdd881161b4
dhcp-relay-debuginfo-4.4.2-22.b1.el9.x86_64.rpm SHA-256: b55556ccafc753f400c7037126d149af6448a0cc2386c39cc47d87211b1f01b9
dhcp-server-4.4.2-22.b1.el9.x86_64.rpm SHA-256: 398dd67aba0731cb24481998af30c0a87d5a42d79b1fcff9b6b7cc7bdb20badf
dhcp-server-debuginfo-4.4.2-22.b1.el9.x86_64.rpm SHA-256: 81ec19a7a86d5747f7969f21616844e87eac996e8815175b96aa49693ed4c684

Red Hat Enterprise Linux for IBM z Systems 9

SRPM
dhcp-4.4.2-22.b1.el9.src.rpm SHA-256: 56e99d7bcf9b82c9930072fdabb75c8ba7873bb23f5023d3230c54498281a731
s390x
dhcp-client-4.4.2-22.b1.el9.s390x.rpm SHA-256: 422f3bd0b6a6caac1dc577ec50800f35e7f172e330a06a59a16356e2470b5be5
dhcp-client-debuginfo-4.4.2-22.b1.el9.s390x.rpm SHA-256: 3677d5b00c55a9ee7d056139fb78f4b36dde53b60cd40ecb5fe9f7f095feb59c
dhcp-common-4.4.2-22.b1.el9.noarch.rpm SHA-256: f1598bc62299b149b3b7d2f9ee0b1d582a2304938fdb41645cf24e7287b91709
dhcp-debuginfo-4.4.2-22.b1.el9.s390x.rpm SHA-256: b775fa1badb094ab0c473873587fe35debb47a5a26454694732c14848f8414f4
dhcp-debugsource-4.4.2-22.b1.el9.s390x.rpm SHA-256: 2e7e0b56adc73969e92277f3cd00e2fba2738a0140e328dd2357b47a41d9803d
dhcp-relay-4.4.2-22.b1.el9.s390x.rpm SHA-256: 6dab1397904489b1a24c9049917797a88f4e5685edad6e81da3cf70301abcce1
dhcp-relay-debuginfo-4.4.2-22.b1.el9.s390x.rpm SHA-256: 5199ec82674c877985ecc8ae7fae21274b0601d32598155d48666b5464d6708c
dhcp-server-4.4.2-22.b1.el9.s390x.rpm SHA-256: 69fb330837cb1c5776fc34344bf115b5ec7ffc36a1dbfa141c19e227c46a3896
dhcp-server-debuginfo-4.4.2-22.b1.el9.s390x.rpm SHA-256: fb5c9373380358c5926531818cdbb2903c948f2010592147d90a7540a769843d

Red Hat Enterprise Linux for Power, little endian 9

SRPM
dhcp-4.4.2-22.b1.el9.src.rpm SHA-256: 56e99d7bcf9b82c9930072fdabb75c8ba7873bb23f5023d3230c54498281a731
ppc64le
dhcp-client-4.4.2-22.b1.el9.ppc64le.rpm SHA-256: c0981473bf5818b96bb1dfb62a871f548ef650ddf84c6e99d27b5160d4382e84
dhcp-client-debuginfo-4.4.2-22.b1.el9.ppc64le.rpm SHA-256: 451a4d8f42c8b2bfb9a7cfb1f157f86eb3ea1c65532bb3852b95e4f0de319239
dhcp-common-4.4.2-22.b1.el9.noarch.rpm SHA-256: f1598bc62299b149b3b7d2f9ee0b1d582a2304938fdb41645cf24e7287b91709
dhcp-debuginfo-4.4.2-22.b1.el9.ppc64le.rpm SHA-256: 4d90953db48ccef4b84749d507deca0ef1019e38ae107213e80c860747b2dc92
dhcp-debugsource-4.4.2-22.b1.el9.ppc64le.rpm SHA-256: 3a173d962f57c3e32c77e0c022db99b9489bdcf4581a7bafcef20e94597f2814
dhcp-relay-4.4.2-22.b1.el9.ppc64le.rpm SHA-256: 4d3d0c5790404492d07b0aa1d38d167eeaf9de117bd9fdb73d5dd4731f98d28c
dhcp-relay-debuginfo-4.4.2-22.b1.el9.ppc64le.rpm SHA-256: 2aba6aae2ca8c05f9b30c7f397e02d25e9b9bf0973be81bc72c07085930ff81d
dhcp-server-4.4.2-22.b1.el9.ppc64le.rpm SHA-256: 120d18e57813f9c77f3798acd60a6bf73c4e26b14ae4a24dd0ca29d4c0fc9b61
dhcp-server-debuginfo-4.4.2-22.b1.el9.ppc64le.rpm SHA-256: 971576fe755917bf8c9d9ad044a40e4031514f8b5ae45bb00b4bf45ff3da137f

Red Hat Enterprise Linux for ARM 64 9

SRPM
dhcp-4.4.2-22.b1.el9.src.rpm SHA-256: 56e99d7bcf9b82c9930072fdabb75c8ba7873bb23f5023d3230c54498281a731
aarch64
dhcp-client-4.4.2-22.b1.el9.aarch64.rpm SHA-256: 2927f029083266e1ba1762ee96c12b88f53ebb589068fd591ad19777a33265a5
dhcp-client-debuginfo-4.4.2-22.b1.el9.aarch64.rpm SHA-256: 2fafe92e1ca4afe7609667aea05f55a82cd017c59b6babb9d9d7e9c0592b60ca
dhcp-common-4.4.2-22.b1.el9.noarch.rpm SHA-256: f1598bc62299b149b3b7d2f9ee0b1d582a2304938fdb41645cf24e7287b91709
dhcp-debuginfo-4.4.2-22.b1.el9.aarch64.rpm SHA-256: f817c9577d7290ca4bc14f7fc94b98beab1e1ec3acbed889c00ba7afdae08d35
dhcp-debugsource-4.4.2-22.b1.el9.aarch64.rpm SHA-256: bdffa956753771158869c8c1e5829f902add581aeafe2476d59c69b880cc25be
dhcp-relay-4.4.2-22.b1.el9.aarch64.rpm SHA-256: a0128568f7df2b5d3880cc085c2f2ce1cca0d06c0e6cbd63fb39396c300411b5
dhcp-relay-debuginfo-4.4.2-22.b1.el9.aarch64.rpm SHA-256: 336e3d9814fb9eb41e45099fb329fa07d05afa0c6295fac1aba3e5c9cd30e573
dhcp-server-4.4.2-22.b1.el9.aarch64.rpm SHA-256: 601d099571f8efc5241bc55576cb6cf00eb3aab8ebda350a1f3336c39e6f99d1
dhcp-server-debuginfo-4.4.2-22.b1.el9.aarch64.rpm SHA-256: d8c8f2d5df53265598d72f7cd85859dd2f4a610221ba8d78d7e1faf2398d30ca

The Red Hat security contact is secalert@redhat.com. More contact details at https://access.redhat.com/security/team/contact/.