{"id":"DEBIAN-CVE-2026-56117","details":"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.","modified":"2026-09-14T17:03:20.660008843Z","published":"2026-06-23T17:17:09.540Z","upstream":["CVE-2026-56117"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-56117"}],"affected":[{"package":{"name":"dhcpcd","ecosystem":"Debian:13","purl":"pkg:deb/debian/dhcpcd?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:10.1.0-11+deb13u3"}]}],"versions":["1:10.1.0-11","1:10.1.0-11+deb13u1","1:10.1.0-11+deb13u2"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-56117.json"}},{"package":{"name":"dhcpcd","ecosystem":"Debian:14","purl":"pkg:deb/debian/dhcpcd?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:10.3.2-4"}]}],"versions":["1:10.1.0-11","1:10.1.0-12","1:10.2.0-1","1:10.2.2-1","1:10.2.2-2","1:10.2.2-3","1:10.2.2-4","1:10.2.2-5","1:10.2.2-6","1:10.2.3-1","1:10.2.4-1","1:10.2.4-2","1:10.2.4-3","1:10.2.4-4","1:10.2.4-4~bpo13+1","1:10.3.0-1","1:10.3.0-2","1:10.3.0-2~bpo13+1","1:10.3.0-3","1:10.3.0-3~bpo13+1","1:10.3.0-4","1:10.3.0-5","1:10.3.0-6","1:10.3.0-7","1:10.3.0-7~bpo13+1","1:10.3.1-1","1:10.3.1-1~bpo13+1","1:10.3.1-2","1:10.3.1-3","1:10.3.1-4","1:10.3.1-5","1:10.3.1-5~bpo13+1","1:10.3.2-1","1:10.3.2-2","1:10.3.2-3","1:10.3.2-3~bpo13+1","1:10.3.2-4~bpo13+1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-56117.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}