CWE
770
Advisory Published
Updated

CVE-2022-42312

First published: Tue Nov 01 2022(Updated: )

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

Credit: security@xen.org

Affected SoftwareAffected VersionHow to fix
debian/xen<=4.11.4+107-gef32c7afa2-1
4.14.6-1
4.14.5+94-ge49571868d-1
4.17.1+2-gb773c48e36-1
4.17.2+55-g0b56bed864-1
Xen Xen
Debian Debian Linux=11.0
Fedoraproject Fedora=35
Fedoraproject Fedora=36
Fedoraproject Fedora=37

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Frequently Asked Questions

  • What is CVE-2022-42312?

    CVE-2022-42312 is a vulnerability in Xen where malicious guests can cause xenstored to allocate vast amounts of memory, resulting in a Denial of Service (DoS) attack.

  • How severe is CVE-2022-42312?

    CVE-2022-42312 has a severity rating of 6.5, which is considered medium.

  • Which software is affected by CVE-2022-42312?

    Xen versions 4.11.4+107-gef32c7afa2-1, 4.14.6-1, 4.14.5+94-ge49571868d-1, 4.17.1+2-gb773c48e36-1, 4.17.2+55-g0b56bed864-1 and Debian Linux 11.0, Fedora 35, Fedora 36, and Fedora 37 are affected by CVE-2022-42312.

  • How do I fix CVE-2022-42312?

    To fix CVE-2022-42312, update Xen to one of the patched versions provided: 4.14.6-1, 4.14.5+94-ge49571868d-1, 4.17.1+2-gb773c48e36-1, or 4.17.2+55-g0b56bed864-1.

  • Where can I find more information about CVE-2022-42312?

    You can find more information about CVE-2022-42312 at the following references: [Xen Security Advisory 326](https://xenbits.xen.org/xsa/advisory-326.html), [Debian Security Tracker](https://security-tracker.debian.org/tracker/CVE-2022-42312), [Xen Advisory 326](http://xenbits.xen.org/xsa/advisory-326.html).

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