CVE-2026-56114: NetworkConfiguration dhcpcd, грешка в паметта

Описание

Оригинално описание

dhcpcd through 10.3.2, fixed in commit 2f00c7b, contains a one-byte stack out-of-bounds write vulnerability in dhcp6_makemessage() in src/dhcp6.c that allows unauthenticated same-link attackers to write beyond a fixed local buffer by serializing an oversized RFC6603 OPTION_PD_EXCLUDE option body. Attackers can send a crafted DHCPv6 ADVERTISE message containing an IA_PD IAPREFIX /0 with a valid OPTION_PD_EXCLUDE using an exclude prefix length of /121 through /128 to trigger the out-of-bounds write and potentially corrupt adjacent stack memory.

Засегнати продукти

• NetworkConfiguration dhcpcd: до 10.3.2; 2f00c7bfc408b6582d331932dfa47829c4819029

Вид слабост

• CWE-787 Out-of-bounds Write

История

Други уязвимости в NetworkConfiguration dhcpcd

• 5.7CVE-2026-56117
• 7.1CVE-2026-56116
• 6.0CVE-2026-56113

Първоизточници

• https://www.cve.org/CVERecord?id=CVE-2026-56114
• https://nvd.nist.gov/vuln/detail/CVE-2026-56114
• https://github.com/NetworkConfiguration/dhcpcd/commit/2f00c7bfc408b6582d331932dfa47829c4819029
• https://www.vulncheck.com/advisories/dhcpcd-stack-out-of-bounds-write-in-dhcp6-makemessage