CVE-2026-53921

01/תיאור (מקור, אנגלית)

odhcpd is the DHCPv6, DHCPv4, and router-advertisement server used by OpenWrt. Prior to version 25.12, odhcpd's DHCPv6 IA response handler writes past the end of a fixed 512-byte stack buffer (pdbuf) when a single DHCPv6 REQUEST carries enough IA options to nearly exhaust the reply space. Two independent overflow sites exist in the same call chain, both reachable from the network via a single unauthenticated UDP packet. odhcpd runs as root on OpenWrt; embedded targets often lack stack canaries and ASLR, making code execution realistic. This issue has been patched in version 25.12.

02/קישורים8

• github.com/openwrt/odhcpd/commit/0320032ae313452f3c8cb8725c621‮…
• github.com/openwrt/odhcpd/commit/03dacc23356b5789842b9d1bba020‮…
• github.com/openwrt/odhcpd/commit/2a42d34c3615e2449ca273f673eee‮…
• github.com/openwrt/odhcpd/commit/6634b7a3c79c41a27687925c98c35‮…
• github.com/openwrt/odhcpd/commit/d168c27fb6a55a07ac4c888e09ff2‮…
• github.com/openwrt/odhcpd/commit/d329a15413387027453644cd363dc‮…
• github.com/openwrt/odhcpd/security/advisories/GHSA-7fwx-hhrg-3‮…
• github.com/openwrt/odhcpd/security/advisories/GHSA-7fwx-hhrg-3‮…