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CVE-2026-56114 on Cyberus Linux 26.05

Aliases: CVE-2026-56114

Packages: dhcpcd

Status: Plausible

Advisory Information

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.

Updates

2026-09-21 20:32 CEST

Metadata changes:

  • Status for package dhcpcd: “Plausible”

2026-09-21 17:05 CEST

Metadata changes:

  • Status for package dhcpcd: “New”