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USN-5126-1: Bind vulnerability

28 October 2021

Bind could be made to consume resources if it received specially crafted network traffic.



  • bind9 - Internet Domain Name Server


Kishore Kumar Kothapalli discovered that Bind incorrectly handled the lame
cache when processing responses. A remote attacker could possibly use this
issue to cause Bind to consume resources, resulting in a denial of service.

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 21.10
Ubuntu 21.04
Ubuntu 20.04
Ubuntu 18.04

In general, a standard system update will make all the necessary changes.


Related notices

  • USN-5126-2: libisc160, libdns100, libisccfg90, libirs-export141, libisccc-export140, liblwres141, bind9, lwresd, libbind-dev, host, libbind9-90, libisc95, libbind9-140, libdns162, libisccfg-export140, dnsutils, bind9utils, libisccc140, libbind-export-dev, libisccfg140, bind9-host, liblwres90, libisccc90, bind9-doc, libisccc-export140-udeb, libisc-export160, libdns-export162, libirs141