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UBUNTU-CVE-2026-56116

Type: advisorySource: OSV1 source record

dhcpcd through 10.3.2, fixed in commit 708b4a5, contains a memory leak vulnerability in the IPv6 Router Advertisement route information handling that allows an unauthenticated same-link attacker to cause denial of service by sending crafted Router Advertisements. Attackers can repeatedly send Router Advertisements containing Route Information options with a lifetime of zero, triggering unfreed allocations in routeinfo_findalloc() that cause linear memory exhaustion and eventual daemon crash.

Announced Source revision 1
Original source ↗

UBUNTU-CVE-2026-56116

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: osv:UBUNTU-CVE-2026-56116

dhcpcd

Source reference: /affected/0/package/name

Affected versions
1:10.1.0-8

Source reference: /affected/0/versions

1:10.1.0-10

Source reference: /affected/0/versions

1:10.1.0-11

Source reference: /affected/0/versions

1:10.1.0-12

Source reference: /affected/0/versions

1:10.2.4-3

Source reference: /affected/0/versions

1:10.2.4-4

Source reference: /affected/0/versions

Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

dhcpcd

Source reference: /affected/1/package/name

Affected versions
1:10.2.4-4

Source reference: /affected/1/versions

1:10.3.0-2

Source reference: /affected/1/versions

1:10.3.0-3

Source reference: /affected/1/versions

1:10.3.0-7

Source reference: /affected/1/versions

Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          }
        ]
      }
    ],
    "package": {
      "name": "dhcpcd",
      "purl": "pkg:deb/ubuntu/dhcpcd?arch=source&distro=questing",
      "ecosystem": "Ubuntu:25.10"
    },
    "versions": [
      "1:10.1.0-8",
      "1:10.1.0-10",
      "1:10.1.0-11",
      "1:10.1.0-12",
      "1:10.2.4-3",
      "1:10.2.4-4"
    ],
    "database_specific": {
      "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-56116.json"
    },
    "ecosystem_specific": {
      "binaries": [
        {
          "binary_name": "dhcpcd",
          "binary_version": "1:10.2.4-4"
        },
        {
          "binary_name": "dhcpcd-base",
          "binary_version": "1:10.2.4-4"
        },
        {
          "binary_name": "dhcpcd5",
          "binary_version": "1:10.2.4-4"
        }
      ]
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          }
        ]
      }
    ],
    "package": {
      "name": "dhcpcd",
      "purl": "pkg:deb/ubuntu/dhcpcd?arch=source&distro=resolute",
      "ecosystem": "Ubuntu:26.04:LTS"
    },
    "versions": [
      "1:10.2.4-4",
      "1:10.3.0-2",
      "1:10.3.0-3",
      "1:10.3.0-7"
    ],
    "database_specific": {
      "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-56116.json"
    },
    "ecosystem_specific": {
      "binaries": [
        {
          "binary_name": "dhcpcd",
          "binary_version": "1:10.3.0-7"
        },
        {
          "binary_name": "dhcpcd-base",
          "binary_version": "1:10.3.0-7"
        },
        {
          "binary_name": "dhcpcd5",
          "binary_version": "1:10.3.0-7"
        }
      ]
    }
  }
]

Publisher severity

No explicit severity was provided.

Event
#14638 · Revision 1
Added to Heist Feed
Publisher date
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