CVE-2022-2928: Debian Linux

Medium severity, CVSS 6.5. EPSS: 0.7% chance of exploitation in the next 30 days.

In ISC DHCP 4.4.0 -> 4.4.3, ISC DHCP 4.1-ESV-R1 -> 4.1-ESV-R16-P1, when the function option_code_hash_lookup() is called from add_option(), it increases the option's refcount field. However, there is not a corresponding call to option_dereference() to decrement the refcount field. The function add_option() is only used in server responses to lease query packets. Each lease query response calls this function for several options, so eventually, the reference counters could overflow and cause the server to abort.

Affected products

• Debian Debian Linux: version 10.0 only
• Fedoraproject Fedora: version 35 only; version 36 only; version 37 only
• ISC Dhcp: from 4.4.0, up to and including 4.4.3; version 4.1-esv only

Published 2022-10-07. Last modified 2026-06-17.