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NULL Pointer Dereference The advisory has been revoked - it doesn't affect any version of package isc-dhcp  (opens in a new tab)

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  • Snyk IDSNYK-DEBIAN14-ISCDHCP-11746851
  • published10 Aug 2025
  • disclosed7 Oct 2022
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Introduced: 7 Oct 2022

CVE-2022-2928  (opens in a new tab)
CWE-476  (opens in a new tab)

Amendment

The Debian security team deemed this advisory irrelevant for Debian:14.

NVD Description

Note: Versions mentioned in the description apply only to the upstream isc-dhcp package and not the isc-dhcp package as distributed by Debian.

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.

References