CVE-2022-23034: Integer Underflow
First published: Tue Jan 25 2022(Updated: )
A PV guest could DoS Xen while unmapping a grant To address XSA-380, reference counting was introduced for grant mappings for the case where a PV guest would have the IOMMU enabled. PV guests can request two forms of mappings. When both are in use for any individual mapping, unmapping of such a mapping can be requested in two steps. The reference count for such a mapping would then mistakenly be decremented twice. Underflow of the counters gets detected, resulting in the triggering of a hypervisor bug check.
Credit: security@xen.org
| Affected Software | Affected Version | How 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-unstable | >=3.2.0<4.13.0 | |
| Fedora | =34 | |
| Debian | =9.0 | |
| Debian | =11.0 |
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Reference Links
- http://www.openwall.com/lists/oss-security/2022/01/25/3
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/OMR6UBGJW6JKND7IILGQ2CU35EQPF3E3/
- https://security.gentoo.org/glsa/202208-23
- https://www.debian.org/security/2022/dsa-5117
- https://xenbits.xenproject.org/xsa/advisory-394.txt
- https://xenbits.xen.org/xsa/advisory-394.html
- https://security-tracker.debian.org/tracker/CVE-2022-23034
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OMR6UBGJW6JKND7IILGQ2CU35EQPF3E3/
Frequently Asked Questions
What is the severity of CVE-2022-23034?
CVE-2022-23034 is classified as a high severity vulnerability that allows a PV guest to cause denial of service on Xen.
How do I fix CVE-2022-23034?
To remediate CVE-2022-23034, update Xen to a fixed version starting from 4.14.6-1 or later.
Who is affected by CVE-2022-23034?
CVE-2022-23034 affects users of Xen with IOMMU enabled configurations, particularly those running affected Xen versions.
What systems are impacted by CVE-2022-23034?
The vulnerability impacts systems using specific versions of Xen on Debian and Fedora, including Debian 9.0, Debian 11.0, and Fedora 34.
What actions should I take if my systems are vulnerable to CVE-2022-23034?
If your systems are vulnerable to CVE-2022-23034, apply the necessary updates to mitigate the risk.
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