CVE-2026-56117
published 2026-06-23CVE-2026-56117: dhcpcd through 10.3.2, fixed in commit 78ea09e, contains a heap use-after-free vulnerability in the control socket handling within src/control.c that allows…
PriorityP424medium5.5CVSS 3.1
AVLACLPRLUINSUCNINAH
EPSS
0.09%
0.7th percentile
dhcpcd through 10.3.2, fixed in commit 78ea09e, contains a heap use-after-free vulnerability in the control socket handling within src/control.c that allows local unprivileged attackers to trigger memory corruption when privilege separation is disabled. Attackers can connect to the control socket and send a privileged command such as -x, causing control_recvdata() to free the client object while the same READ+HANGUP event subsequently reaches control_hangup() with the stale pointer, resulting in a use-after-free condition exploitable in deployments using --disable-privsep or where privsep initialization has failed with the control socket operating in mode 0666.
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
nvdv3.15.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
nvdv4.05.7MEDIUMCVSS:4.0/AV:L/AC:L/AT:P/PR:L/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_redhat4.7MEDIUM
Stop checking back — get the weekly exploitation signal.
Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.
Red Hat
dhcpcd: dhcpcd: Local heap use-after-free vulnerability leads to denial of service.
vendor_redhat·2026-06-23·CVSS 4.7
CVE-2026-56117 [MEDIUM] CWE-825 dhcpcd: dhcpcd: Local heap use-after-free vulnerability leads to denial of service.
dhcpcd: dhcpcd: Local heap use-after-free vulnerability leads to denial of service.
dhcpcd through 10.3.2, fixed in commit 78ea09e, contains a heap use-after-free vulnerability in the control socket handling within src/control.c that allows local unprivileged attackers to trigger memory corruption when privilege separation is disabled. Attackers can connect to the control socket and send a privileged command such as -x, causing control_recvdata() to free the client object while the same READ+HANGUP event subsequently reaches control_hangup() with the stale pointer, resulting in a use-after-free condition exploitable in deployments using --disable-privsep or where privsep initialization has failed with the control socket operating in mode 0666.
A flaw was found in dhcpcd. A heap use-after
VulDB
NetworkConfiguration dhcpcd up to 10.3.2 Control Socket Operatingmode src/control.c control_recvdata use after free
vuldb·2026-06-24·CVSS 4.7
CVE-2026-56117 [MEDIUM] NetworkConfiguration dhcpcd up to 10.3.2 Control Socket Operatingmode src/control.c control_recvdata use after free
A vulnerability was found in NetworkConfiguration dhcpcd up to 10.3.2 and classified as critical. The affected element is the function control_recvdata of the file src/control.c of the component Control Socket Operatingmode. The manipulation results in use after free.
This vulnerability is cataloged as CVE-2026-56117. The attack must be initiated from a local position. There is no exploit available.
It is suggested to upgrade the affected component.
GHSA
dhcpcd through 10.3.2, fixed in commit 78ea09e, contains a heap use-after-free vulnerability in the control socket handling within src/control.c that allows local unprivileged attackers to trigger mem
ghsa_unreviewed·2026-06-23
CVE-2026-56117 [MEDIUM] CWE-416 dhcpcd through 10.3.2, fixed in commit 78ea09e, contains a heap use-after-free vulnerability in the control socket handling within src/control.c that allows local unprivileged attackers to trigger mem
dhcpcd through 10.3.2, fixed in commit 78ea09e, contains a heap use-after-free vulnerability in the control socket handling within src/control.c that allows local unprivileged attackers to trigger memory corruption when privilege separation is disabled. Attackers can connect to the control socket and send a privileged command such as -x, causing control_recvdata() to free the client object while the same READ+HANGUP event subsequently reaches control_hangup() with the stale pointer, resulting in a use-after-free condition exploitable in deployments using --disable-privsep or where privsep initialization has failed with the control socket operating in mode 0666.
No detection rules found.
No public exploits indexed.
Bugzilla
CVE-2026-56117 dhcpcd: dhcpcd: Local heap use-after-free vulnerability leads to denial of service.
bugzilla·2026-06-23·CVSS 4.7
CVE-2026-56117 [MEDIUM] CVE-2026-56117 dhcpcd: dhcpcd: Local heap use-after-free vulnerability leads to denial of service.
CVE-2026-56117 dhcpcd: dhcpcd: Local heap use-after-free vulnerability leads to denial of service.
dhcpcd through 10.3.2, fixed in commit 78ea09e, contains a heap use-after-free vulnerability in the control socket handling within src/control.c that allows local unprivileged attackers to trigger memory corruption when privilege separation is disabled. Attackers can connect to the control socket and send a privileged command such as -x, causing control_recvdata() to free the client object while the same READ+HANGUP event subsequently reaches control_hangup() with the stale pointer, resulting in a use-after-free condition exploitable in deployments using --disable-privsep or where privsep initialization has failed with the control socket operating in mode 0666.
Bugzilla
CVE-2026-56117 dhcpcd: dhcpcd: Local heap use-after-free vulnerability leads to denial of service. [epel-all]
bugzilla·2026-06-23·CVSS 4.7
CVE-2026-56117 [MEDIUM] CVE-2026-56117 dhcpcd: dhcpcd: Local heap use-after-free vulnerability leads to denial of service. [epel-all]
CVE-2026-56117 dhcpcd: dhcpcd: Local heap use-after-free vulnerability leads to denial of service. [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.
Bugzilla
CVE-2026-56117 dhcpcd: dhcpcd: Local heap use-after-free vulnerability leads to denial of service. [fedora-all]
bugzilla·2026-06-23·CVSS 4.7
CVE-2026-56117 [MEDIUM] CVE-2026-56117 dhcpcd: dhcpcd: Local heap use-after-free vulnerability leads to denial of service. [fedora-all]
CVE-2026-56117 dhcpcd: dhcpcd: Local heap use-after-free vulnerability leads to denial of service. [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.
2026-06-23
Published