UBUNTU-CVE-2026-56116
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.
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/versions1:10.1.0-10Source reference:
/affected/0/versions1:10.1.0-11Source reference:
/affected/0/versions1:10.1.0-12Source reference:
/affected/0/versions1:10.2.4-3Source reference:
/affected/0/versions1:10.2.4-4Source 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/versions1:10.3.0-2Source reference:
/affected/1/versions1:10.3.0-3Source reference:
/affected/1/versions1:10.3.0-7Source 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