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

Severity MEDIUM

CVSS Score 6.5

CVSS Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H

CWE CWE-770

Public Exploit ✅ No

Source NVD

Published 2022-11-01

Updated 2026-06-08

Modified 2025-05-06

Fix URL http://xenbits.xen.org/xsa/advisory-326.html

Software	From version	Fixed in
debian-linux	—	—
fedora	—	—
xen	—	—