CVE-2026-56116
published 2026-06-23CVE-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…
PriorityP425medium6.5CVSS 3.1
AVAACLPRNUINSUCNINAH
EPSS
0.19%
8.5th percentile
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.
Affected
3 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| dhcpcd_project | dhcpcd | <= 10.3.2 | — |
| dhcpcd_project | dhcpcd | — | — |
| networkconfiguration | dhcpcd | <= 10.3.2 | — |
CVSS provenance
nvdv3.16.5MEDIUMCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
nvdv4.07.1HIGHCVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vendor_redhat6.5MEDIUM
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VulDB
NetworkConfiguration dhcpcd up to 10.3.2 Router routeinfo_findalloc memory leak
vuldb·2026-06-24·CVSS 6.5
CVE-2026-56116 [MEDIUM] NetworkConfiguration dhcpcd up to 10.3.2 Router routeinfo_findalloc memory leak
A vulnerability was found in NetworkConfiguration dhcpcd up to 10.3.2. It has been classified as problematic. This issue affects the function routeinfo_findalloc of the component Router Handler. The manipulation leads to memory leak.
This vulnerability is documented as CVE-2026-56116. The attack requires being on the local network. There is not any exploit available.
Upgrading the affected component is recommended.
GHSA
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 ca
ghsa_unreviewed·2026-06-23
CVE-2026-56116 [HIGH] CWE-401 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 ca
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.
Red Hat
dhcpcd: dhcpcd: Denial of Service via IPv6 Router Advertisement memory leak
vendor_redhat·2026-06-23·CVSS 6.5
CVE-2026-56116 [MEDIUM] CWE-772 dhcpcd: dhcpcd: Denial of Service via IPv6 Router Advertisement memory leak
dhcpcd: dhcpcd: Denial of Service via IPv6 Router Advertisement memory leak
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.
A flaw was found in dhcpcd. An unauthenticated attacker on the same network link can exploit a memory leak vulnerability in the IPv6 Router Advertisement route information handling. By repeatedly sending specially crafted Rou
No detection rules found.
No public exploits indexed.
Bugzilla
CVE-2026-56116 dhcpcd: dhcpcd: Denial of Service via IPv6 Router Advertisement memory leak
bugzilla·2026-06-23·CVSS 6.5
CVE-2026-56116 [MEDIUM] CVE-2026-56116 dhcpcd: dhcpcd: Denial of Service via IPv6 Router Advertisement memory leak
CVE-2026-56116 dhcpcd: dhcpcd: Denial of Service via IPv6 Router Advertisement memory leak
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.
Bugzilla
CVE-2026-56116 dhcpcd: dhcpcd: Denial of Service via IPv6 Router Advertisement memory leak [fedora-all]
bugzilla·2026-06-23·CVSS 6.5
CVE-2026-56116 [MEDIUM] CVE-2026-56116 dhcpcd: dhcpcd: Denial of Service via IPv6 Router Advertisement memory leak [fedora-all]
CVE-2026-56116 dhcpcd: dhcpcd: Denial of Service via IPv6 Router Advertisement memory leak [fedora-all]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
Bugzilla
CVE-2026-56116 dhcpcd: dhcpcd: Denial of Service via IPv6 Router Advertisement memory leak [epel-all]
bugzilla·2026-06-23·CVSS 6.5
CVE-2026-56116 [MEDIUM] CVE-2026-56116 dhcpcd: dhcpcd: Denial of Service via IPv6 Router Advertisement memory leak [epel-all]
CVE-2026-56116 dhcpcd: dhcpcd: Denial of Service via IPv6 Router Advertisement memory leak [epel-all]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
2026-06-23
Published