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Vulnerabilities CVE-2026-56117

CVE-2026-56117

Medium
Open
TLP:CLEAR

dhcpcd Heap Use-After-Free via Control Socket Handling

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Description

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.

Details

CVSS Score
5.7
EPSS Score
0.09%

0.7th percentile

CVSS Vector
CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Confidence
90%
Published
Jun 23, 2026
Last Modified
Jul 28, 2026
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