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CVE-2026-56117 on Cyberus Linux 26.05

Aliases: CVE-2026-56117

Packages: dhcpcd

Status: Plausible

Advisory Information

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.

Updates

2026-09-21 20:32 CEST

Metadata changes:

  • Status for package dhcpcd: “Plausible”

2026-09-21 17:05 CEST

Metadata changes:

  • Status for package dhcpcd: “New”