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.
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
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| 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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