{"id":"AZL-90213","summary":"CVE-2026-56113 affecting package dhcpcd for versions less than 10.0.8-4","details":"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.","modified":"2026-08-29T05:27:27Z","published":"2026-06-23T17:17:09Z","upstream":["CVE-2026-56113"],"references":[{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-56113"}],"affected":[{"package":{"name":"dhcpcd","ecosystem":"Azure Linux:3","purl":"pkg:rpm/azure-linux/dhcpcd"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"10.0.8-4"}]}],"database_specific":{"source":"https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-90213.json"}}],"schema_version":"1.9.0"}