CVE-2026-56117

dhcpcd: dhcpcd through 10.3.2, fixed in commit 78ea09e, contains a heap use-after-free vulnerability in the control socket ha...

CVE-2026-56117 is fixed in dhcpcd on 1 platform, first by DEBIAN-CVE-2026-56117, released July 2, 2026. It is not reported as exploited. Patch Radar priority: Routine.

Routine
CVSS
5.5
medium
Exploitation
None reported
No vendor assessment
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.0014
3rd 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.

Where it's fixed

ProductFixed inFixReleased
Linux
dhcpcd · Debian 13.5 (trixie) 1:10.1.0-11+deb13u3 DEBIAN-CVE-2026-56117 Jul 2, 2026
dhcpcd · Debian 14 1:10.3.2-4 DEBIAN-CVE-2026-56117 Jul 2, 2026
dhcpcd · opensuse-leap 16.0 10.5.0-160000.1.1 OPENSUSE-SU-2026:21692-1 Aug 30, 2026
dhcpcd · sles 16.0 10.5.0-160000.1.1 SUSE-SU-2026:23562-1 Aug 30, 2026

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