CVE-2026-56113

Name
CVE-2026-56113
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.
NVD Severity
unknown
Other trackers
CVE, NVD, CERT, CVE Details, CIRCL, Arch Linux, Debian, Red Hat, Ubuntu, Gentoo, SUSE (Bugzilla), SUSE (CVE), Mageia
Mailing lists
oss-security, full-disclosure, bugtraq
Exploits
Exploit DB, Metasploit
Forges
GitHub (code, issues), Aports (code, issues)

References

Type URI
disclosure@vulncheck.com https://github.com/NetworkConfiguration/dhcpcd/commit/5733d3c59a5651f64357ac11c98b4f39895c8d25
disclosure@vulncheck.com https://www.vulncheck.com/advisories/dhcpcd-heap-use-after-free-in-dhcp6-deprecateaddrs-via-dhcpv6-renew

Match rules

CPE URI Source package Min version Max version
cpe:2.3:a:dhcpcd_project:dhcpcd:*:*:*:*:*:*:*:* dhcpcd >= None <= 10.3.2

Vulnerable and fixed packages

Source package Branch Version Maintainer Status
dhcpcd edge-main 10.3.2-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
dhcpcd edge-main 10.3.0-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
dhcpcd edge-main 10.2.4-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
dhcpcd edge-main 10.2.3-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
dhcpcd edge-main 10.2.2-r1 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
dhcpcd edge-main 10.2.2-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
dhcpcd edge-main 10.2.0-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
dhcpcd edge-main 10.1.0-r1 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
dhcpcd edge-main 10.1.0-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
dhcpcd 3.24-main 10.3.2-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
dhcpcd 3.23-main 10.3.0-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
dhcpcd 3.22-main 10.2.3-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
dhcpcd 3.21-main 10.1.0-r1 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
dhcpcd 3.21-main 10.1.0-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
dhcpcd 3.20-main 10.0.6-r1 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
dhcpcd 3.20-main 10.0.6-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
dhcpcd 3.19-main 10.0.5-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable