UBUNTU-CVE-2022-42318

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UBUNTU-CVE-2022-42318

Summary:

Details: 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

References: https://ubuntu.com/security/CVE-2022-42318, https://xenbits.xen.org/xsa/advisory-326.html, https://xenbits.xenproject.org/xsa/advisory-326.txt, http://xenbits.xen.org/xsa/advisory-326.html, https://www.cve.org/CVERecord?id=CVE-2022-42318