CVE-2023-6516

Description

To keep its cache database efficient, `named` running as a recursive resolver occasionally attempts to clean up the database. It uses several methods, including some that are asynchronous: a small chunk of memory pointing to the cache element that can be cleaned up is first allocated and then queued for later processing. It was discovered that if the resolver is continuously processing query patterns triggering this type of cache-database maintenance, `named` may not be able to handle the cleanup events in a timely manner. This in turn enables the list of queued cleanup events to grow infinitely large over time, allowing the configured `max-cache-size` limit to be significantly exceeded. This issue affects BIND 9 versions 9.16.0 through 9.16.45 and 9.16.8-S1 through 9.16.45-S1.

How to fix CVE-2023-6516

To remediate CVE-2023-6516, upgrade the affected package to a fixed version below.

• —upgrade to 9.16.48-r0 or later
• —upgrade to 1:9.16.48-1 or later

Is CVE-2023-6516 being exploited?

Low — EPSS is 0.2%, meaning exploitation activity has not been observed at scale.

Affected packages (2)

• from 0, < 9.16.48-r0
• from 0, < 1:9.16.48-1

CVSS scores

References (2)

• ADVISORYsecurity.alpinelinux.org/vuln/CVE-2023-6516
• ADVISORYsecurity-tracker.debian.org/tracker/CVE-2023-6516