CVE-2022-42318

Description

Xenstore: guests can let run xenstored out of memory T[his CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] Malicious guests can cause xenstored to allocate vast amounts of memory, eventually resulting in a Denial of Service (DoS) of xenstored. There are multiple ways how guests can cause large memory allocations in xenstored: - - by issuing new requests to xenstored without reading the responses, causing the responses to be buffered in memory - - by causing large number of watch events to be generated via setting up multiple xenstore watches and then e.g. deleting many xenstore nodes below the watched path - - by creating as many nodes as allowed with the maximum allowed size and path length in as many transactions as possible - - by accessing many nodes inside a transaction

How to fix CVE-2022-42318

To remediate CVE-2022-42318, upgrade the affected package to a fixed version below.

• —upgrade to 4.15.4-r0 or later
• —upgrade to 4.14.5+86-g1c354767d5-1 or later

Is CVE-2022-42318 being exploited?

Low — EPSS is 0.1%, meaning exploitation activity has not been observed at scale.

Affected packages (2)

• from 0, < 4.15.4-r0
• from 0, < 4.14.5+86-g1c354767d5-1

CVSS scores

References (2)

• ADVISORYsecurity.alpinelinux.org/vuln/CVE-2022-42318
• ADVISORYsecurity-tracker.debian.org/tracker/CVE-2022-42318