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CVE-2026-56113 on Cyberus Linux 26.05

Aliases: CVE-2026-56113

Packages: dhcpcd

Status: Plausible

Advisory Information

dhcpcd through 10.3.2, fixed in commit 5733d3c, contains a heap use-after-free vulnerability that allows unauthenticated same-link attackers to crash the daemon by sending a crafted DHCPv6 RENEW reply with RFC6603 OPTION_PD_EXCLUDE and both preferred and valid lifetimes set to zero. Attackers acting as or impersonating a DHCPv6 server can trigger dhcp6_deprecatedele() to free a delegated child address while an outer TAILQ_FOREACH_SAFE iterator in dhcp6_deprecateaddrs() still holds the freed pointer, causing a use-after-free when TAILQ_REMOVE is reached.

Updates

2026-09-21 20:31 CEST

Metadata changes:

  • Status for package dhcpcd: “Plausible”

2026-09-21 17:05 CEST

Metadata changes:

  • Status for package dhcpcd: “New”