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CVE PROGRAM SOURCE RECORD6.0 Medium

CVE-2026-56113

dhcpcd Heap Use-After-Free in dhcp6_deprecateaddrs via DHCPv6 RENEW

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Status
Published
Published
Updated
Assigning organization
VulnCheck

Description

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

NetworkConfiguration dhcpcd

Default version status: affected

  • 0 to ≤ 10.3.2affected
  • 5733d3c59a5651f64357ac11c98b4f39895c8d25unaffected
pkg:github/NetworkConfiguration/dhcpcd

References